JP6819591B2 - Information processing equipment and methods, and programs - Google Patents

Description

The present technology relates to information processing devices and methods, and programs, and more particularly to information processing devices, methods, and programs that make it easier to construct signal transmission lines.

Conventionally, in order to suppress the influence of obstacles on the communicable range, it is conceivable to install a communication antenna used for transmitting and receiving wireless signals at a high place such as on the roof of a house. It was. However, if a dedicated communication cable is laid from the communication device installed indoors to the antenna on the roof, construction work for that purpose is required, which may increase the cost.

Therefore, existing equipment such as a coaxial cable that transmits the broadcast signal received by the broadcast signal receiving antenna on the roof to an indoor TV receiver or the like is transmitted between the communication antenna and the indoor communication device. A method of using it as a transmission path for a signal or a received signal has been considered (see, for example, Patent Document 1).

Japanese Patent No. 4125545

However, since the band of the broadcast signal differs depending on the region, in the case of the method described in Patent Document 1, the contractor or the like examines the frequency band (free band) not used for the broadcast signal, and the transmission signal or the received signal The band to be transmitted must be manually set to the free band, which requires complicated setting work and may increase the cost.

This technique has been proposed in view of such a situation, and an object of the present technology is to construct a signal transmission line more easily.

The information processing device on one aspect of the present technology is a frequency band that is not used for transmission of the broadcast signal within the transmittable band that is the frequency band in which the signal can be transmitted of the coaxial cable that transmits the received broadcast signal. The difference in signal level between the predetermined signal and the broadcast signal is reduced between the transmission band setting unit that sets a part or all of the free band as a transmission band that is a frequency band used for transmitting a predetermined signal. A gain setting unit that sets the gain amount of the signal level of the predetermined signal and a signal processing unit that transmits a mixed signal of the predetermined signal and the broadcast signal via the coaxial cable are controlled so as to be used. A control unit that converts the frequency band of the predetermined signal into the transmission band set by the transmission band setting unit and amplifies the signal level of the predetermined signal with the gain amount set by the gain setting unit. It is an information processing device provided.

The information processing method of one aspect of the present technology is used by the information processing apparatus for transmitting the broadcast signal within the transmittable band, which is the frequency band in which the signal can be transmitted, of the coaxial cable that transmits the received broadcast signal. A part or all of the free band, which is a frequency band that is not set , is set as a transmission band, which is a frequency band used for transmitting a predetermined signal, and the difference in signal level between the predetermined signal and the broadcast signal is reduced. The signal processing unit that transmits the mixed signal of the predetermined signal and the broadcast signal is controlled via the coaxial cable by setting the gain amount of the signal level of the predetermined signal so as to control the predetermined signal. This is an information processing method in which the frequency band of the above is converted into the set transmission band, and the signal level of the predetermined signal is amplified by the set gain amount .

The program of one aspect of the present technology allows the computer to transmit the received broadcast signal at a frequency within the transmittable band of the coaxial cable that can transmit the signal, which is not used for the transmission of the broadcast signal. The difference in signal level between the predetermined signal and the broadcast signal is set between a transmission band setting unit that sets a part or all of the free band, which is a band, as a transmission band that is a frequency band used for transmitting a predetermined signal. A gain setting unit that sets the gain amount of the signal level of the predetermined signal and a signal processing unit that transmits a mixed signal of the predetermined signal and the broadcast signal via the coaxial cable are controlled so as to reduce the amount. As a control unit that converts the frequency band of the predetermined signal into the transmission band set by the transmission band setting unit and amplifies the signal level of the predetermined signal with the gain amount set by the gain setting unit. It is a program to make it work.

In the information processing device and method of one aspect of the present technology, and in the program, the transmission of the broadcast signal within the transmittable band, which is the frequency band in which the signal can be transmitted, of the coaxial cable that transmits the received broadcast signal. some or all of the free band is a frequency band that is not in use, is set as a transmission band is a frequency band used for transmission of a predetermined signal, the difference between the signal level of the broadcast signal and the predetermined signal The gain amount of the signal level of the predetermined signal is set so as to be reduced, and the signal processing unit that transmits the mixed signal of the predetermined signal and the broadcast signal via the coaxial cable is controlled, and the predetermined signal is controlled. The frequency band of is converted into the set transmission band, and the signal level of the predetermined signal is amplified by the set gain amount.

According to the present technology, information can be processed. Further, according to the present technology, a signal transmission line can be constructed more easily.

It is a figure which shows the main configuration example of a position notification system. It is a figure explaining the example of the state of the position notification. It is a figure which shows the main configuration example of a relay station. It is a figure which shows the main configuration example of a transmitter. It is a figure which shows the main configuration example of a super frame. It is a figure explaining the example of the signal in each part. It is a figure which shows the main structural example of a mixer. It is a figure which shows the main configuration example of PF. It is a figure which shows the main configuration example of a high-sensitivity receiver. It is a figure which shows the example of the received signal waveform. It is a figure explaining the example of the state of the approximation of the phase fluctuation. It is a figure which shows the decoding result. It is a figure explaining the example of the frequency band of a broadcast signal. It is a figure explaining an example of a free band. It is a flowchart explaining an example of the flow of a control process. It is a flowchart explaining the example of the flow of the transmission band setting process. It is a figure which shows the main configuration example of a relay station. It is a figure which shows the main configuration example of a high-sensitivity receiver. It is a block diagram which shows the main configuration example of a server. It is a flowchart explaining an example of the flow of a control process. It is a flowchart explaining the example of the flow of the transmission band setting process. It is a figure explaining the example of the state of the signal level of each signal to be transmitted. It is a figure which shows the main structural example of a mixer. It is a figure which shows the main configuration example of a high-sensitivity receiver. It is a flowchart explaining an example of the flow of a control process. It is a flowchart explaining an example of the flow of a gain setting process. It is a figure which shows the main configuration example of a relay station. It is a figure which shows the main structural example of a mixer. It is a figure which shows the main configuration example of a high-sensitivity transmitter / receiver. It is a figure explaining an example of a transmission band. It is a flowchart explaining an example of the flow of a control process. It is a flowchart explaining the example of the flow of the transmission band setting process. It is a figure explaining an example of a control signal. It is a figure which shows the main structural example of a mixer. It is a figure which shows the main configuration example of a high-sensitivity receiver. It is a flowchart explaining an example of the flow of a control process. It is a flowchart explaining the example of the flow of the transmission band setting process. It is a figure which shows the main configuration example of a relay station. It is a figure which shows the main configuration example of a high-sensitivity receiver. It is a flowchart explaining an example of the flow of a control process. It is a flowchart explaining the example of the flow of the transmission band setting process. It is a figure which shows the main configuration example of the anti-theft system. It is a block diagram which shows the main configuration example of a computer.

Hereinafter, embodiments for carrying out the present disclosure (hereinafter referred to as embodiments) will be described. The explanation will be given in the following order.
1. 1. First Embodiment (Search for Free Bandwidth)
2. 2. Second embodiment (use of GNSS (Global Navigation Satellite System) signal)
3. 3. Third embodiment (signal level adjustment)
4. Fourth embodiment (signal transmission / reception)
5. Fifth Embodiment (spectral diffusion of control signal)
6. Sixth embodiment (use of information on TV receiver)
7. Seventh Embodiment (Example of signal transmission / reception system)

<1. First Embodiment>
<Location notification system>
FIG. 1 is a diagram showing a main configuration example of a position notification system, which is an embodiment of a signal transmission / reception system to which the present technology is applied. The position notification system 100 shown in FIG. 1 is a system in which the transmitter 101 notifies its own position.

The transmitter 101 transmits position information indicating its own position as a radio signal. The relay station 102 receives the radio signal, acquires the position information of the transmitter 101, and supplies the position information to the server 104 via the network 103. The server 104 manages the position information for each transmitter 101. The terminal device 105 operated by a user who wants to know the position of the transmitter 101 accesses the server 104 via the network 103, acquires the position information of the transmitter 101, and displays it together with map data or the like, for example. Notify the user of the location of the transmitter 101.

The transmitter 101 is carried by, for example, a target person whose position is desired to be grasped by the user. In the example of FIG. 1, the elderly person 110 is made to carry the transmitter 101. The transmitter 101 can obtain its own position information (for example, latitude and longitude) as appropriate, for example, by receiving a GNSS signal from a GNSS (Global Navigation Satellite System) satellite. The transmitter 101 appropriately transmits the position information as a radio signal. Therefore, the user can operate the terminal device 105 as described above to grasp the position of the elderly person 110 who is the target of position monitoring.

The target person for position monitoring is arbitrary. For example, it may be a child, an animal such as a dog or a cat, or an employee of a company. The transmitter 101 may be configured as a dedicated device, but may be incorporated into a portable information processing device such as a mobile phone or a smartphone, for example.

The network 103 is an arbitrary communication network, may be a communication network for wired communication, may be a communication network for wireless communication, or may be composed of both of them. Further, the network 103 may be composed of one communication network or may be composed of a plurality of communication networks. For example, the Internet, public telephone network, wide area communication network for wireless mobiles such as so-called 3G line and 4G line, WAN (Wide Area Network), LAN (Local Area Network), communication conforming to Bluetooth (registered trademark) standard. Wireless communication networks, short-range wireless communication paths such as NFC (Near Field Communication), infrared communication paths, standards such as HDMI (registered trademark) (High-Definition Multimedia Interface) and USB (Universal Serial Bus) The network 103 may include a communication network or communication path of an arbitrary communication standard, such as a communication network for wired communication conforming to the above.

The server 104 and the terminal device 105 are information processing devices that process information. The server 104 and the terminal device 105 are communicably connected to the network 103, and can communicate with other communication devices connected to the network 103 via the network 103 to exchange information.

In such a position notification system 100, the number of transmitters 101, relay stations 102, servers 104, and terminal devices 105 is arbitrary, and may be plural. For example, as shown in FIG. 2, it is assumed that the position notification system 100 has N relay stations 102 (N is an arbitrary natural number) installed at different positions (relay stations 102-1 to relay stations). 102-N).

The timing at which the transmitter 101 transmits a wireless signal (position information) is arbitrary. For example, the transmitter 101 may periodically transmit a wireless signal, or transmit it when a predetermined event occurs (for example, when a predetermined distance is moved or when a predetermined time is reached). You may try to do it.

In this case, the radio signal transmitted from the transmitter 101 is received by the relay station 102 located near the transmitter 101. When the transmitter 101 transmits a radio signal from within the communicable range 121 of the relay station 102-K (K is an integer of 1 ≦ K ≦ N), the relay station 102-K receives the radio signal and transmits the radio signal. The position information of the machine 101 is acquired, and the position information is supplied to the server 104 via the network 103 (the position information is relayed).

For example, when the elderly person 110 (transmitter 101) moves within the communicable range of another relay station 102 and the transmitter 101 transmits a radio signal, the relay station 102 similarly relays the position information. Therefore, as long as the elderly person 110 (transmitter 101) is located within the communicable range of any of the relay stations 102, the user can grasp the position of the elderly person 110.

The server 104 manages the position information of the transmitter 101. When a plurality of transmitters 101 exist, the server 104 manages the position information for each transmitter 101. For example, the transmitter 101 transmits its own identification information (ID) together with the position information. The server 104 stores and manages the position information in association with the ID of the transmitter 101. Therefore, the server 104 can provide only the position information of the transmitter 101 requested by the user (terminal device 105). The server 104 can also manage the users who are permitted to provide the location information for each transmitter 101. That is, the server 104 can provide the position information of each transmitter 101 only to the user who is permitted to acquire the position information of the transmitter 101.

The server 104 may manage the position information of the transmitter 101 in association with information other than the ID of the transmitter 101. For example, the server 104 may store and manage the position information of the transmitter 101 in association with the time information and the like. By doing so, the server 104 can manage and provide the history of the position information of the transmitter 101.

The time information may be transmitted from the transmitter 101. For example, the transmitter 101 may transmit the time information included in the GNSS signal together with the position information as a radio signal.

Further, the position information transmitted by the transmitter 101 may be any information that can be managed by the server 104 as information indicating the position of the transmitter 101, and the content thereof is arbitrary. For example, the transmitter 101 may transmit the GNSS signal (or the time information included in the GNSS signal) without obtaining the position information from the GNSS signal. In that case, the relay station 102, the server 104, or the like may obtain the position information of the transmitter 101 by using the GNSS signal or the time information. Further, an information processing device (server or the like) for obtaining the position information of the transmitter 101 may be separately provided by using the GNSS signal or the time information.

Further, for example, the position of the transmitter 101 may be obtained based on the installation position of the relay station 102 that receives the radio signal from the transmitter 101. For example, in the case of FIG. 2, the transmitter 101 is located within the communicable range 121 of the relay station 102. In such a case, the server 104 estimates that the transmitter 101 is located within the communicable range 121 of the relay station 102-K when the relay station 102-K relays, and manages that fact as location information. You may do so. That is, in this case, the position of the transmitter 101 is managed by the particle size of the number of relay stations 102 (the width of the communicable range of each relay station 102). In this case, the transmitter 101 may at least transmit its own ID as a wireless signal.

Further, for example, the distance between the relay station 102 and the transmitter 101 may be estimated from the radio wave intensity of the radio signal received by the relay station 102, and the server 104 may also manage the distance as position information. That is, the server 104 may manage which relay station 102 the transmitter 101 is located within the communicable range of which relay station 102, and how far the relay station 102 and the transmitter 101 are. The estimation of this distance may be performed by the relay station 102, the server 104, or a dedicated information processing device (server or the like) provided separately. May be good.

Further, for example, when the transmitter 101 is located in a portion where the communicable ranges of the plurality of relay stations 102 overlap, that is, when the radio signal transmitted by the transmitter 101 is relayed by the plurality of relay stations 102, the triangle is formed. The position of the transmitter 101 may be estimated by using a method or the like. The estimation of this position may be performed by, for example, the server 104, or may be performed by a dedicated information processing device (server or the like) provided separately.

Each relay station 102 may be able to relay the information of any transmitter 101, or may be able to relay only the information of the transmitter 101 corresponding to itself. For example, the information transmitted from a certain transmitter 101 may be relayed only by the relay station 102 owned or managed by the owner (or administrator) of the transmitter 101. The owner (or manager) may include not only an individual but also a business operator. By doing so, it is possible to avoid sharing the relay station 102 with a plurality of users, and it is possible to suppress a decrease in communication safety such as information leakage. Further, the number of available relay stations 102 may be set according to the amount of the fee paid by the user. As a result, it is possible to differentiate the quality of services provided according to the consideration.

<Relay station>
As described above, the server 104 can manage the position of the transmitter 101 in a state where the transmitter 101 is located within the communicable range of any of the relay stations 102. In other words, if the position of the transmitter 101 deviates from the communicable range of any of the relay stations 102, the server 104 cannot manage the position. Therefore, the wider the communicable range network of the relay station 102 with the transmitter 101, the more accurately the server 104 can manage the position of the transmitter 101. Here, more accurate management means managing the position of the transmitter 101 in a wider range. That is, in order to make the range in which the position of the transmitter 101 can be managed wider, the transmitter 101 and the relay station 102 can transmit and receive wireless signals farther (communication of each relay station 102 is possible). The wider the range) is preferred. Further, since the relay stations 102 are installed at different positions from each other, it is preferable that the number of relay stations 102 is large. Further, considering the usefulness, it is preferable to set the communicable range of the relay station 102 in the area where the transmitter 101 is more likely to be located.

The installation position of the relay station 102 is arbitrary. However, as described above, considering the number of installations, usefulness, etc., for example, in a building such as a building, a condominium, or a house, a position monitoring target person (for example, an elderly person 110) carrying a transmitter 101 is active. It is suitable because there are many in urban areas where there is a high possibility and it is easy to install. In particular, the home of the position monitoring target person is more likely to be located in the vicinity thereof, and is suitable. Further, in terms of securing the installation location, it is easier and easier to obtain consent than when the location notification service provider independently secures the location and installs the relay station 102.

Further, for example, when the location monitoring target person (or user) purchases or borrows the relay station 102 and installs it, the location notification service provider does not install the relay station 102 independently. The load (cost) of the service provider can be reduced. That is, by doing so, more relay stations 102 can be installed at a lower cost. As described above, as the location notification system 100, the larger the number of relay stations 102, the better the quality of services that can be provided, which is preferable. That is, a more useful system can be realized at a lower cost.

As described above, the relay station 102 can be installed at any place, and may be installed on a movable object (also referred to as a moving body) such as an automobile, a motorcycle, or a bicycle. That is, the position of the relay station 102 may be variable.

<Installation of communication antenna>
In the following, a case where the relay station 102 is installed at the home (house) of the position monitoring target person will be described as an example. In general, if the antenna is installed at a low position, the receiving performance may be reduced due to the low ground clearance or obstacles. As described above, the wider the communicable range of the relay station 102 is, the more preferable it is. Therefore, in order to widen the communicable range, the antenna of the relay station 102 is installed as high as possible, for example, on the roof of a house. Is preferable.

For example, when a communication antenna for receiving a signal from the transmitter 101 is installed on the roof and a receiver for receiving the communication antenna is installed indoors, the communication antenna and the receiver are antennas. It is necessary to connect so that communication is possible with a cable or the like. However, if a dedicated communication cable is laid as the antenna cable, a separate construction is required for the laying, which may increase the cost for installing the equipment of the relay station 102. In addition, since construction work is performed on existing buildings, there are often restrictions. For example, the wiring length of the antenna cable becomes long due to detour wiring, etc., and the signal until it reaches the receiver There was also the possibility that the amount of attenuation would increase.

<Signal transmission using existing equipment>
Therefore, as in the example shown in FIG. 3, the signal is transmitted from the communication antenna to the receiver by using existing equipment (for example, an antenna cable for a broadcast signal that has already been laid). ..

In the case of the example of FIG. 3, the relay station 102 is installed on the roof of the building 130, which is the home (house) of the position monitoring target person. The building 130 may be a detached house, a building in which a store, an office, or the like is housed, or an apartment house, a condominium, or the like.

A terrestrial antenna 141, a satellite antenna 142, an antenna 143, and a mixer 144 are installed on the roof of the building 130. The equipment installed on these roofs is also collectively referred to as roof equipment 131. Further, inside the building 130, a distributor 151, a power supply 152, a TV receiver 153, and a high-sensitivity receiver 154 are installed. Further, the mixer 144 and the distributor 151 are connected by an antenna cable 145, which is a predetermined communication cable (transmission line).

The terrestrial antenna 141 is an antenna for receiving a broadcast signal of terrestrial TV digital broadcasting, and is connected to the mixer 144 via a predetermined antenna cable. The broadcast signal received by the terrestrial antenna 141 is supplied to the mixer 144 via the antenna cable.

The satellite antenna 142 is an antenna for receiving broadcast signals of satellite broadcasts such as BS (Broadcasting Satellite) broadcasts and CS (Communications Satellite) broadcasts, and is connected to the mixer 144 via a predetermined antenna cable. .. The broadcast signal received by the satellite antenna 142 is supplied to the mixer 144 via the antenna cable. The satellite antenna 142 is driven by using the electric power supplied from the mixer 144 via the antenna cable.

The antenna 143 is an antenna for receiving a radio signal transmitted from the transmitter 101, and is connected to the mixer 144 via a predetermined antenna cable. The received signal, which is a radio signal received by the antenna 143, is supplied to the mixer 144 via the antenna cable.

The mixer 144 mixes the broadcast signal of the terrestrial TV digital broadcast supplied from the terrestrial antenna 141, the broadcast signal of the satellite broadcast supplied from the satellite antenna 142, and the received signal supplied from the antenna 143. The mixed signal is transmitted to the antenna cable 145. Further, the mixer 144 supplies the electric power supplied through the antenna cable 145 to the satellite antenna 142. Further, the mixer 144 acquires a control signal transmitted via the antenna cable 145 and drives according to the control signal.

The antenna cable 145 is connected to the mixer 144 and the distributor 151, and transmits the mixed signal from the mixer 144 to the distributor 151. The antenna cable 145 is composed of, for example, a coaxial cable. Further, the antenna cable 145 transmits electric power (DC component) from the distributor 151 to the mixer 144 via the distributor 151. Further, the antenna cable 145 transmits a control signal for controlling the mixer 144 from the distributor 151 to the mixer 144.

The distributor 151 supplies the mixed signal transmitted via the antenna cable 145 to the TV receiver 153 and the high-sensitivity receiver 154. Further, the distributor 151 supplies the electric power (DC component) supplied from the power source 152 to the antenna cable 145. This electric power is the electric power used in the satellite antenna 142 and the mixer 144, is superimposed as a DC component on the mixed signal transmitted from the mixer 144, and is supplied to the mixer 144 via the antenna cable 145. Further, the distributor 151 transmits a control signal for the mixer 144 supplied from the high-sensitivity receiver 154 to the antenna cable 145. This control signal is superimposed on the DC component (or mixed signal) as a signal having a frequency of, for example, about several tens of kHz, and is supplied to the mixer 144 via the antenna cable 145.

The power source 152 has, for example, an outlet or the like, and supplies electric power such as a household power source to the distributor 151 as a DC component.

The TV receiver 153 and the high-sensitivity receiver 154 are, for example, equipment installed indoors in a building 130 and using a broadcast signal transmitted from the roof. The TV receiver 153, for example, extracts a broadcast signal of a desired channel from a mixed signal supplied from the distributor 151 and demodulates it to display an image of a broadcast program of that channel or output audio. Or something. Instead of the TV receiver 153, for example, a set-top box, a hard disk recorder, a router with a TV broadcast tuner, a computer, or the like may be installed indoors.

The high-sensitivity receiver 154 acquires the information transmitted from the transmitter 101 included in the received signal, for example, by extracting the received signal from the mixed signal supplied from the distributor 151 and demodulating it. Further, the high-sensitivity receiver 154 supplies the information to the server 104 via the network 103, for example. Further, the high-sensitivity receiver 154 supplies a control signal for controlling the mixer 144 to the distributor 151.

The above-mentioned terrestrial antenna 141 to antenna cable 145 and the distributor 151 to the high-sensitivity receiver 154 may be provided alone or in plurality. Also, these numbers do not have to match each other.

<Transmission of received signal>
As described above, the received signal (information transmitted from the transmitter 101) received by the antenna 143 is mixed with the broadcast signal by the mixer 144 and transmitted via the antenna cable 145. Therefore, in order to transmit the received signal so as not to interfere with the broadcast signal, it is necessary to transmit the received signal using a frequency band that is not used by the broadcast signal. However, in the method described in Patent Document 1, a contractor or the like examines a frequency band (free band) that is not used for a broadcast signal, and manually sets a band for transmitting a transmission signal or a reception signal to the free band. This requires complicated setting work, which may increase the cost.

Therefore, a free band, which is an unused frequency band within the transmittable band, which is a frequency band in which signals can be transmitted, is obtained from the antenna cable 145, which is a transmission line, and a part or all of the free band is used as a reception signal. To be set to be used for transmission of.

For example, the high-sensitivity receiver 154 receives a part or all of an unused frequency band in the transmittable frequency band of the antenna cable 145, which is a transmission line, in a free band. A setting unit for setting to be used for signal transmission is provided. Then, the control signal including the information indicating the transmission band is transmitted to the mixer 144 via the antenna cable 145. Further, for example, control in which the control signal is acquired by the mixer 144, the received signal is frequency-converted to the transmission band based on the information indicating the transmission band included in the acquired control signal, and transmitted to the antenna cable 145. Make sure to provide a part.

That is, the high-sensitivity receiver 154 is set to detect a free band that is not used for the broadcast signal from the transmittable band and use the available free band as the transmission band of the received signal. Further, the high-sensitivity receiver 154 notifies the mixer 144 of the setting. According to the setting, the mixer 144 frequency-converts the received signal into its transmission band, mixes it with the broadcast signal, and transmits the mixed signal to the high-sensitivity receiver 154 via the antenna cable 145. The high-sensitivity receiver 154 extracts the received signal in the transmission band from the transmitted mixed signal, demodulates the signal, and obtains the transmission information transmitted from the transmitter 101.

By doing so, the received signal can be transmitted in an appropriate frequency band (frequency band that does not interfere with the broadcast signal) according to the band of the broadcast signal, regardless of the installed area. Therefore, since the received signal can be transmitted more easily by using the existing equipment, the signal transmission line can be constructed more easily.

<Transmitter>
Next, the transmitter 101 will be described. The method of transmitting and receiving a wireless signal between the transmitter 101 and the high-sensitivity receiver 154 is arbitrary, and any communication standard may be compliant. For example, a frequency band including 925 MHz (also referred to as a 920 MHz band) may be used so that long-distance communication is possible.

FIG. 4 is a diagram showing a main configuration example of the transmitter 101. In the case of the example shown in FIG. 4, the transmitter 101 includes a pseudo-random number sequence generation unit 161, a carrier oscillation unit 162, a multiplication unit 163, a bandpass filter (BPF) 164, an amplification unit 165, and an antenna 166.

The information (transmission information) transmitted from the transmitter 101 is encoded and transmitted as a pseudo-random number string. The pseudo-random number sequence generation unit 161 generates the pseudo-random number sequence. The pseudo-random number sequence generation unit 161 includes a transmission information generation unit 171, a CRC (Cyclic Redundancy Check) addition unit 172, a synchronization signal generation unit 173, a selection unit 174, a frame counter 175, a register 176, an interleave unit 177, and a Gold code generation unit 178. , And a multiplication unit 179.

The transmission information generation unit 171 generates transmission information TM, which is information to be transmitted as a radio signal. This transmission information TM is arbitrary information. For example, the transmission information generation unit 171 receives a GNSS signal from the GNSS satellite, which is an artificial satellite of the global positioning system, and uses the GNSS signal to provide position information (for example, latitude and longitude) indicating the current position of the transmitter 101. It may be generated and the transmission information TM including the position information may be generated. Further, for example, the transmission information generation unit 171 may generate the transmission information TM including the GNSS signal (or the time information included in the GNSS signal) received from the GNSS satellite. Further, for example, the transmission information generation unit 171 may generate the transmission information TM including the identification information (ID) of the transmitter 101. Further, for example, the transmission information generation unit 171 may acquire information from another device (for example, a sensor or the like) and generate a transmission information TM including the information. The transmitter 101 generates a transmission signal TX using the transmission information TM. The transmission information generation unit 171 supplies the generated transmission information TM to the CRC addition unit 172.

The CRC addition unit 172 adds a cyclic redundancy check code (CRC) for error detection to the transmission information TM supplied from the transmission information generation unit 171. The cyclic redundancy check code may be anything, and its data length is arbitrary. The CRC addition unit 172 supplies the transmission signal TM to which the cyclic redundancy check code is added to the selection unit 174. The synchronization signal generation unit 173 generates a predetermined synchronization pattern. This synchronization pattern may be any, and its data length is arbitrary. The synchronization signal generation unit 173 supplies the synchronization pattern to the selection unit 174. The selection unit 174 adds the synchronization pattern supplied from the synchronization signal generation unit 173 to the transmission information TM to which the cyclic redundancy check code supplied from the CRC addition unit 172 is added by appropriately selecting the input. The selection unit 174 supplies and holds the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added to the register 176.

The transmitter 101 transmits the transmission signal TX using radio waves in the 920 MHz band (for example, the frequency band of 920 MHz to 930 MHz). The 920MHz band is a frequency band that was lifted by the Ministry of Internal Affairs and Communications from July 2011, and anyone can use it without a license. However, according to the regulations (ARIB (Association of Radio Industries and Businesses) STD T-108), the maximum continuous transmission time is limited to 4 seconds. If the continuous transmission time is further shortened to, for example, 0.2 seconds, more channels can be allocated and transmission / reception can be performed with less interference.

Therefore, the transmitter 101 performs one data transmission in units of a super frame (Super Frame) for a predetermined time as shown in FIG. 5, for example. The length of this predetermined time is arbitrary. For example, it may be 30 seconds or 5 minutes. Within this predetermined time, the frame of 0.192 seconds is repeated up to 100 times. That is, since the continuous transmission time is less than 0.2 seconds, many transmission channels can be assigned to this transmission. As a result, it becomes possible to select and transmit a relatively vacant channel, and it is possible to construct a system that is more resistant to interference.

The gap x between frames is a time of at least 2 ms or more. When using the 920MHz band in Japan, it is necessary to perform carrier sense to confirm whether communication is being performed in that band before signal transmission. Then, the signal can be transmitted only when the band is free. Therefore, it is not always possible to use 920 MHz. Therefore, the gap x can be different each time depending on the result of carrier sense (ie, how busy the channels are). The frame is configured to be transmitted approximately once every 0.3 seconds on average for 30 seconds. As a result, 100 frames are transmitted within a predetermined time of the super frame. The number of frames that can be transmitted varies slightly depending on the degree of channel congestion. The signals transmitted in 100 frames are arbitrary, but will be described below assuming that they are all the same.

In this way, in order to repeatedly transmit the same frame, the register 176 holds the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added, which is supplied from the selection unit 174. Then, the register 176 supplies the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added to the interleaving unit 177 repeatedly a predetermined number of times.

At that time, the frame counter 175 repeats the transmission of the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added, that is, the transmission to which the cyclic redundancy check code and the synchronization pattern are added, which is held in the register 176. The number of times the information TM is read is counted. The frame counter 175 supplies such a count value to the register 176. The register 176 grasps the number of times of supply based on the count value. When the register 176 repeats reading the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added a predetermined number of times (for example, 100 times), the register 176 discards the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added. Next, the transmission information TM to which the new cyclic redundancy check code and the synchronization pattern supplied from the selection unit 174 are added is acquired and held.

That is, the frame counter 175 determines the number of times the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added is read up to the maximum number of frames transmitted in the super frame (100 times in the case of FIG. 5). Counting (for example, the frame counter 175 starts counting from a count value of 0 and counts until the count value reaches 99). Then, when the count value reaches the maximum value (for example, 99), the count value is reset to the initial value (for example, 0).

FIG. 6 is a schematic diagram showing an example of a frame format of a transmission packet. As shown in the first row from the top of FIG. 6, the transmitted packets are a 2-octet preamble (Preamble), a 1-octet SFD (start-of-frame delimiter), and a 16-octet PSDU (PHY Service Data Unit). Consists of. Here, the preamble and SFD are fixed data. Its value is arbitrary. The preamble may be, for example, a bit string of "0011111101011001". Further, the SFD may be, for example, a bit string of "00011100".

As shown in the second row from the top of FIG. 6, the 16-octet PSDU includes frame control (FC), sequence number (SN), transmitter / receiver address (ADR), payload (PAYLOAD), and frame check sequence (FCS). ).

The frame control (FC) is 2-octet digital information, and is information representing the structure of information following the frame control and the number of bits. The frame control is an arbitrary fixed bit string, and may be, for example, a bit string of "0010000000100110". The sequence number (SN) is one octet of digital information and is counted up each time new data is transmitted. By checking this sequence number, the receiver can determine whether or not the data is new. The transmitter / receiver address (ADR) is information of 4 octets and includes a transmitter address number (transmitter ID) that identifies the transmitter 101. The payload (PAYLOAD) is 4-octet digital information, and the transmission information TM is set as it is. That is, the payload (PAYLOAD) is generated by the transmission information generation unit 171. The frame check sequence (FCS) is a 2-octet cyclic redundancy check code, and is information for checking whether or not an error has occurred in communication data. This frame check sequence (FCS) is added by the CRC addition unit 172.

Here, the information from the preamble to the transmitter / receiver address (ADR) is generated by the synchronization signal generation unit 173 as a synchronization pattern (SYNC). This 13-octet synchronization pattern (SYNC) is added by the selection unit 174 to the payload (PAYLOAD) to which the frame check sequence (FCS) is added, that is, the 6-octet UND.

The transmission packet having such a configuration is held in the register 176 as a transmission information TM to which a cyclic redundancy check code and a synchronization pattern are added.

The interleaving unit 177 decomposes the synchronization pattern of the transmission information TM to which the cyclic redundancy check code and the synchronization pattern are added, and as shown in the fourth row from the top of FIG. 6, between the other parts (UND). Disperse. This dispersion is performed so that the synchronous patterns are distributed almost evenly.

In the case of the example of FIG. 6, as shown in the third row from the top, the synchronization pattern (SYNC) is information of 13 octets, and UND is information of 6 octets. The interleaving unit 177 decomposes the 13-octet synchronization pattern (SYNC) by 1 octet into SYNC0 to SYNC12, decomposes the 6-octet UND by 1 octet into UND0 to UND5, and sets these into 4 stages from the top of FIG. They are sorted in the order shown (the following order).

SYNC0, SYNC1, UND0, SYNC2, SYNC3, UND1, ..., UND5, SYNC12

In this way, in the high-sensitivity receiver 154, the synchronization pattern (SYNC) known to the high-sensitivity receiver 154 that receives the signal transmitted by the transmitter 101 is distributed (distributed) over the entire frame and transmitted. , The frequency and initial phase estimation of the transmitting carrier can be performed more accurately for each short frame. As a result, the high-sensitivity receiver 154 can receive with higher sensitivity even with a short continuous transmission time. That is, longer-distance communication becomes possible.

An example of the rearranged transmission information QD is shown in the fifth row from the top of FIG. The interleaving unit 177 supplies the transmission information QDs sorted as described above to the multiplication unit 179. The Gold code generator 178 generates a pseudo-random number sequence to be added to the transmission information QD. This pseudo-random number sequence may be anything, and its data length is arbitrary. For example, the Gold code generator 178 may generate a bit string of a predetermined pattern having a length of 256 bits as a pseudo-random number sequence. For example, the Gold code generator 178 may be composed of two M-sequence (Maximum Sequence) generators. The Gold code generation unit 178 supplies the generated pseudo-random number sequence to the multiplication unit 179. The multiplication unit 179 generates a pseudo-random number sequence PN by multiplying the transmission information QD supplied from the interleaving unit 177 and the pseudo-random number sequence supplied from the Gold code generation unit 178.

That is, the multiplication unit 179 allocates a pseudo-random number sequence to each bit of the transmission information QD, and generates, for example, a pseudo-random number sequence PN of 38400 bits (152 bits x 256 chips) from each transmission packet. At that time, a pseudo-random number string assigned to the bit (QD = 0) having a value of "0" and a pseudo-random number string assigned to the bit (QD = 1) having a value "1" in the transmission information QD. Is that the value of each bit is inverted from each other. That is, for example, the multiplication unit 179 allocates a pseudo-random number string to a bit (QD = 0) whose transmission information QD value is "0", and a bit (QD = 1) whose transmission information QD value is "1". A pseudo-random number sequence in which the value of each bit is inverted is assigned to. For example, as shown in the lowermost part of FIG. 6, the multiplication unit 179 has a pseudo-random number sequence “1101000110100 ...... 1001” for a bit (QD = 1) having a value of “1” in the transmission information QD. Is assigned, and the pseudo-random number sequence “0010111001011 ...... 0110” is assigned to the bit (QD = 0) whose value is “0”.

In this pseudo-random number sequence PN, the diffusion coefficient is 256 and the chip interval Δ is 5 μs. The multiplication unit 179 supplies the pseudo-random number sequence PN generated as described above to the multiplication unit 163.

The carrier oscillation unit 162 oscillates at a predetermined frequency (carrier frequency) and generates a carrier signal used for transmission of a radio signal. For example, the carrier oscillator 162 transmits the transmission signal at a center frequency of 925 MHz so as to transmit the transmission signal in the 920 MHz band. The carrier oscillation unit 162 supplies the generated carrier signal to the multiplication unit 163. The multiplication unit 163 modulates the polarity of the carrier signal supplied from the carrier oscillation unit 162 according to the pseudo-random number sequence PN supplied from the multiplication unit 179. For example, the multiplication unit 163 performs BPSK modulation. For example, when the pseudo-random number sequence PN is "1", the carrier phase is modulated to be π, and when the pseudo-random number sequence PN is "0", the carrier phase is −π (polarity inversion). It is modulated. The multiplication unit 163 supplies the modulation result as a modulation signal CM to the bandpass filter (BPF) 164. The BPF 164 limits the band of the modulated signal CM supplied from the multiplication unit 163 to the band of the carrier frequency. The BPF 164 supplies the modulated signal CM whose band is limited in this way to the amplification unit 165 as a transmission signal TX. The amplification unit 165 amplifies the transmission signal TX supplied from the BPF 164 at a predetermined transmission timing, and transmits the amplified transmission signal TX as a radio signal via the antenna 166.

<Mixer>
Next, the side that receives the radio signal transmitted from the transmitter 101 will be described. FIG. 7 is a diagram showing a main configuration example of the mixer 144 of the on-roof equipment 131. In the case of the example shown in FIG. 7, the mixer 144 includes a bandpass filter (BPF) 191 and a low noise amplifier (LNA) 192, a capacitor 193, and a SAW (Surface Acoustic Wave). ) It has a filter 194, a low noise amplifier (LNA) 195, a multiplication unit 196, a mixing unit 197, a capacitor 198, and a distribution unit 199. Further, the mixer 144 has a terminal 201. Further, the mixer 144 includes a power supply filter (PF (Power Filter)) 202, a CPU (Central Processing Unit) 211, and an oscillation unit 212.

The signal received by the terrestrial antenna 141 is supplied to the BPF 191 of the mixer 144 via the antenna cable. BPF191 is a band filter that allows signals in a predetermined frequency band to pass through. For example, the BPF 191 filters the signal received by the terrestrial antenna 141 so as to pass the broadcast signal of the terrestrial TV broadcast and block other signals in an unnecessary frequency band. For example, in Japan, the frequency band of a TV broadcast signal (VHF signal) in the VHF band (30 MHz to 300 MHz) is 90 MHz to 222 MHz. The frequency band of the TV broadcast signal (UHF signal) in the UHF band (300 MHz to 3000 MHz) is 470 MHz to 770 MHz. The BPF191 passes signals in the frequency band of 90 MHz to 770 MHz so as to pass these broadcast signals (VHF / UHF signals), for example.

The output signal (VHF / UHF signal) of BPF191 is supplied to LNA192. The LNA192 amplifies the output signal (VHF / UHF signal) of the BPF191 at a predetermined amplification factor. The LNA192 supplies the amplified VHF / UHF signal to the mixing unit 197.

The signal received by the satellite antenna 142 is supplied to the capacitor 193 of the mixer 144 via the antenna cable. The capacitor 193 functions as a high-pass filter that passes a signal in a band higher than a predetermined cutoff frequency. For example, the capacitor 193 passes a broadcast signal of satellite broadcasting (BS broadcasting / CS broadcasting) through the signal received by the satellite antenna 142, and performs a filtering process so as to block an unnecessary low-frequency component signal. For example, in the case of Japan, the frequency band of the BS broadcast broadcast signal (BS signal) and the CS broadcast broadcast signal (CS signal) is 950 MHz to 2150 MHz. For example, the capacitor 193 passes signals in frequencies lower than 950 MHz as a cutoff frequency so as to pass these broadcast signals (BS / CS signals). For example, the cutoff frequency may be between 770 MHz and 950 MHz so that the broadcast signal of terrestrial TV broadcasting can be blocked.

The output signal (BS / CS signal) of the capacitor 193 is supplied to the mixing unit 197.

The signal received at the antenna 143 is supplied to the SAW filter 194 of the mixer 144 via the antenna cable. The SAW filter 194 applies the characteristics of surface acoustic waves propagating on the surface of a substance, and uses a regular comb-shaped electrode (IDT (Interdigital Transducer)) formed on a thin film of piezoelectric material or a substrate to specify a specific frequency. It is a band filter that extracts the electric signal of the band. The center frequency and band can be determined by the structural period of the comb-shaped electrode and the physical properties of the piezoelectric body and the electrode. For example, the SAW filter 194 filters the signal received by the antenna 143 so as to pass the received signal of the radio signal transmitted from the transmitter 101 and block signals in other unnecessary frequency bands. Do. For example, the frequency band of the radio signal (that is, the received signal) transmitted from the transmitter 101 is 920 MHz to 930 MHz. The SAW filter 194 passes a signal in the frequency band of 920 MHz to 930 MHz so as to pass this received signal.

The output signal (received signal) of the SAW filter 194 is supplied to the LNA 195. The LNA 195 amplifies the output signal (received signal) of the SAW filter 194 at a predetermined amplification factor. The LNA 195 supplies the amplified received signal to the multiplication unit 196.

The multiplication unit 196 converts the frequency of the received signal into the frequency of the carrier signal for transmission by multiplying the reception signal supplied from the LNA 195 by the carrier signal for transmission supplied from the oscillation unit 212. The multiplication unit 196 supplies the frequency-converted received signal to the mixing unit 197.

The mixing unit 197 mixes the VHF / UHF signal supplied from the LNA 192, the BS / CS signal supplied from the capacitor 193, and the received signal supplied from the multiplying unit 196 to generate a mixed signal. In this way, the received signal is mixed with the broadcast signal and transmitted (as a mixed signal) to the indoor distributor 151. Therefore, the multiplication unit 196 frequency-converts the received signal into a frequency band (free band) that is not used by the broadcast signal so that the received signal does not interfere with the broadcast signal (VHF / UHF signal or BS / CS signal). .. The mixing unit 197 supplies the mixing signal to the capacitor 198.

As will be described later, power (DC component), a control signal, and the like are superimposed on the mixed signal when the antenna cable 145 is transmitted. These superposed components (DC components, control signals, etc.) are components supplied from indoor equipment (distributor 151, etc.) to PF202 and CPU211 of the mixer 144. The capacitor 198 is filtered so as to pass the mixed signal and block the superposed components (DC component, control signal, etc.) (so that the superposed component does not enter the mixing unit 197 side). The mixed signal that has passed through the capacitor 198 is supplied to the distribution unit 199.

As described above, the distribution unit 199 is supplied with a signal in which a superimposed component such as a DC component or a control signal is superimposed on the mixed signal that has passed through the capacitor 198. The distribution unit 199 extracts those superimposed components transmitted from the indoor equipment via the antenna cable 145 and supplies them to the PF 202 and the CPU 211. Further, the mixed signal that has passed through the capacitor 198 is supplied to the terminal 201 via the distribution unit 199.

An antenna cable 145 is connected to the terminal 201. That is, the mixed signal is output from the terminal 201 to the antenna cable 145 and transmitted to the distributor 151 via the antenna cable 145.

The PF202 filters the signal (superimposed component) supplied from the distribution unit 199 and extracts the electric power (DC component). The PF185 supplies the extracted electric power to, for example, the satellite antenna 142 or the like. The satellite antenna 142 is driven by its electric power and receives a broadcast signal of satellite broadcasting. Further, this electric power may also be used to drive each processing unit of the mixer 144.

The CPU 211 is a processing unit that performs processing related to control of frequency conversion of the received signal. The CPU 211 has a configuration necessary for control and calculation, such as RAM (Random Access Memory). The CPU 211 controls the frequency conversion of the received signal, for example, based on the control signal included in the signal (superimposed component) supplied from the distribution unit 199. For example, the control signal includes information on the frequency band of the frequency conversion destination of the received signal, and the CPU 211 controls to convert the frequency of the received signal into the frequency specified by the information. More specifically, the CPU 211 controls the oscillating unit 212 to oscillate at a frequency specified by the information included in the control signal.

The oscillating unit 212 oscillates according to the control of the CPU 211, and generates a carrier signal (carrier signal for transmission) having a frequency specified by the CPU 211. The oscillator unit 212 supplies the generated carrier signal for transmission to the multiplication unit 196. As described above, the multiplication unit 196 multiplies the received signal by the carrier signal for transmission, so that the frequency of the received signal is frequency-converted to the frequency of the carrier signal for transmission. That is, the frequency of the received signal is frequency-converted to the transmission band specified by the control signal. Therefore, for example, the mixer 144 can mix the received signal so as not to interfere with the broadcast signal and transmit the antenna cable 145. That is, the signal transmission line can be constructed more easily.

<PF>
A main configuration example of the PF202 is shown in FIG. As shown in FIG. 8, the PF202 includes inductors 221 to 223, and capacitors 224 to 226. The inductors 221 to 223 are connected in series with each other. One of the inductors 221 is connected to the distribution unit 199 and the other is connected to the inductor 222. One of the inductor 222 is connected to the inductor 221 and the other is connected to the inductor 223. One of the inductors 223 is connected to the inductor 222, and the other is connected to each processing unit of the satellite antenna 142 and the mixer 144.

One of the capacitors 224 is connected between the inductor 221 and the inductor 222, and the other is grounded. One of the capacitors 225 is connected between the inductor 222 and the inductor 223, and the other is grounded. One of the capacitors 226 is connected between the inductor 223 and the processing units of the satellite antenna 142 and the mixer 144, and the other is grounded.

For example, the PF202 performs filtering by such an LC circuit to extract electric power (DC component).

<High-sensitivity receiver>
FIG. 9 is a diagram showing a main configuration example of the high-sensitivity receiver 154. As shown in FIG. 9, the high-sensitivity receiver 154 has a signal processing unit 231 and an information processing unit 232. Further, the signal processing unit 231 and the information processing unit 232 are connected to each other via the bus 233.

The signal processing unit 231 performs signal processing for extracting a received signal from the mixed signal transmitted from the mixer 144. The signal processing unit 231 includes a switching unit 241, a SAW filter 242, an LNA 243, an oscillator unit 244, a frequency dividing unit 245, an IQ generator 246, a multiplication unit 247, an LPF248, an AAF (Anti-Aliasing Filter) 249, and an ADC (Analog Digital Converter). It has 250, a multiplication unit 251, LPF252, AAF253, ADC254, and bus 255.

The switching unit 241 is controlled by, for example, the control unit 261 to switch the connection destination of the external terminal of the high-sensitivity receiver 154 on the internal side of the high-sensitivity receiver 154. For example, the switching unit 241 uses the external terminal as an input terminal by connecting the external terminal to a configuration on the input side (for example, a SAW filter 242 or the like). Further, for example, the switching unit 241 uses the external terminal as an output terminal by connecting the external terminal to a configuration on the output side (for example, bus 255 or the like). On the external side of the high-sensitivity receiver 154, this external terminal is connected to the distributor 151.

The SAW filter 242 performs a filter process on the mixed signal supplied via the switching unit 241 so that it passes through the signal components of the transmission band and blocks the components of the other bands. This transmission band is a frequency band for transmitting a received signal set by the transmission band setting unit 263, or a wider frequency band including the frequency band. This transmission band setting is set in the SAW filter 242 under the control of the control unit 261. The SAW filter 242 performs a filter process so as to pass through the set transmission band. The SAW filter 242 supplies the extracted signal component (that is, the received signal) to the LNA 243. The LNA 243 amplifies the supplied received signal and supplies it to the multiplication unit 247 and the multiplication unit 251.

The oscillating unit 244 oscillates at a predetermined frequency under the control of the control unit 261 and supplies an oscillation signal of that frequency to the frequency dividing unit 245. The frequency dividing unit 245 divides the oscillation signal supplied from the oscillating unit 244 according to the control of the control unit 261. The frequency dividing unit 245 supplies the divided oscillation signal to the IQ generator 246. The IQ generator 246 uses the oscillation signal supplied from the frequency divider 245 to generate an oscillation signal for each of I and Q. That is, the IQ generator 246 controls the phase of the signal and generates two oscillation signals that are 90 degrees out of phase with each other. The IQ generator 246 supplies the generated oscillation signal for I to the multiplication unit 247, and supplies the oscillation signal for Q to the multiplication unit 251.

The multiplication unit 247 multiplies the received signal supplied from the LNA 243 with the oscillation signal supplied from the IQ generator 246 to generate a baseband InPhase signal (I signal). The multiplication unit 247 supplies the I signal to the LPF248. The LPF248 extracts a frequency component lower than a predetermined cutoff frequency by performing a low-pass filter process on the supplied I signal. The LPF248 supplies the I signal of the filtering result to the AAF249. The AAF249 filters the supplied I signal so as to suppress aliasing (aliasing error). For example, the AAF249 performs a low-pass filter process so that the supplied I signal passes a frequency component lower than a predetermined cutoff frequency. The AAF249 supplies the I signal of the filtering result to the ADC 250. The ADC 250 converts the supplied I signal from an analog signal to a digital signal (A / D conversion). The ADC 250 supplies the I signal of the digital signal to the information processing unit 232 (for example, the demodulation unit 265 and the like) via the bus 233.

Further, the multiplication unit 251 multiplies the received signal supplied from the LNA 243 with the oscillation signal supplied from the IQ generator 246 to generate a baseband Quadrature signal (Q signal). The multiplication unit 251 supplies the Q signal to the LPF252. The LPF252 performs a low-pass filter processing on the supplied Q signal. The LPF252 supplies the Q signal of the filter processing result to the AAF253. The AAF253 filters the supplied Q signal so as to suppress aliasing. The AAF253 supplies the Q signal of the filter processing result to the ADC 254. The ADC 254 A / D-converts the supplied Q signal, and supplies the Q signal of the obtained digital signal to the information processing unit 232 (for example, the demodulation unit 265, etc.) via the bus 233.

That is, the signal processing unit 231 is controlled by the control unit 261 to perform signal processing on the received signal that has been frequency-converted to the transmission band set by the transmission band setting unit 263 and transmitted, and the I signal and the Q signal are processed. It is generated and supplied to the information processing unit 232.

The bus 255 transmits the control signal generated by the control signal processing unit 264, which is supplied from the information processing unit 232 via the bus 233, to the switching unit 241. When the switching unit 241 connects the external terminal to the bus 255, the control signal transmitted via the bus 255 is supplied to the antenna cable 145 via the switching unit 241. That is, it is transmitted to the mixer 144.

The information processing unit 232 performs information processing on the I signal and the Q signal supplied from the signal processing unit 231, that is, the information (received information) transmitted from the transmitter 101. As shown in FIG. 9, the information processing unit 232 includes a bus 260, a control unit 261 and a memory 262, a transmission band setting unit 263, a control signal processing unit 264, a demodulation unit 265, and a communication unit 266.

The processing units of the control unit 261 to the communication unit 266 are connected to each other via the bus 260, and can exchange information. A bus 233 is also connected to the bus 260. Therefore, each processing unit of the information processing unit 232 can exchange information with each processing unit of the signal processing unit 231.

The control unit 261 performs processing related to control of each processing unit of the memory 262 to the communication unit 266. The control unit 261 also performs processing related to control of each processing unit of the signal processing unit 231. The memory 262 has an arbitrary writable (rewritable) recording medium (storage medium) such as a semiconductor memory such as RAM, SSD (Solid State Drive), or flash memory, or a magnetic recording medium such as a hard disk. The memory 262 stores various information (programs, data, etc.) supplied from, for example, the control unit 261 and the transmission band setting unit 263 to the communication unit 266 by the recording medium (storage medium). Further, the memory 262 can also supply the information stored by itself to, for example, the control unit 261 and the transmission band setting unit 263 to the communication unit 266. Further, the memory 262 can store the information supplied from the signal processing unit 231 via the bus 233, and the stored information can be supplied to the signal processing unit 231 via the bus 233. ..

The transmission band setting unit 263 is controlled by the control unit 261 to perform processing related to the setting of the transmission band. The control signal processing unit 264 is controlled by the control unit 261 to perform processing related to the control signal. The demodulation unit 265 is controlled by the control unit 261 to perform processing related to demodulation of the I signal and the Q signal supplied from the signal processing unit 231. The communication unit 266 is controlled by the control unit 261 to perform processing related to communication with other devices.

When the signal processing unit 231 processes the received signal, the received signal is detected as, for example, a waveform as shown in FIG. The demodulation unit 265 extracts frame data from such a waveform based on the peak position and the like, and corrects the frequency, the initial phase, and the like. The upper part of FIG. 11 shows an example of the phase change in the frame. In FIG. 11, frames 5 (Frame 5) to 8 (Frame 8) are extracted and displayed, but the phases and frequencies of each are slightly changed. The demodulation unit 265 obtains a straight line that best approximates the phase change with respect to the phase fluctuating in this way, and obtains a correlation value β2 (n), as shown in the lower part of FIG. In the lower part of FIG. 11, the slope of each straight line corresponds to γ (n), and the initial phase corresponds to θ (n). Further, the correlation value β2 (n) changes according to the correlation between the phase fluctuation and the approximate straight line. The demodulation unit 265 adds the frame data using such a correlation value β2 (n) as a weighting coefficient.

The constellation of the result of decoding as described above is shown in FIG. As shown in FIG. 12, since the two points are separated as BPSK modulation, in this case, the data is correctly decoded. The demodulation unit 265 demodulates this by BPSK to obtain received information.

As described above, the transmitter 101 can be set to shorten the maximum continuous transmission time. For example, by setting 0.2 seconds in the 920 MHz band, it is possible to select and transmit from many frequency channels. It is possible to build a transmission / reception system that is stronger against interference. Further, by accumulating a large number of frames for a short time, it is possible to improve the effective SNR without exceeding the limit of the maximum transmission time stipulated by the Radio Law. At this time, since the synchronization signal is dispersed over the entire frame, even if there is a phase fluctuation in the frame, the phase and frequency can be corrected more appropriately. As a result, for example, the high-sensitivity receiver 154 can obtain the received information more accurately even if the received signal is so weak that it is buried in noise and difficult to decode by the conventional method. That is, the high-sensitivity receiver 154 can receive the radio signal transmitted by the transmitter 101 with higher sensitivity, and can widen the communicable range with the transmitter 101.

<Transmission band setting>
In the case of Japan, the broadcast signal is distributed in the frequency band as shown in FIG. 13, for example. However, not all of these frequency bands are used, and there are free bands that are not used even within these frequency bands. The mixer 144 and the high-sensitivity receiver 154 utilize this free band to transmit the received signal (including the information transmitted from the transmitter 101) received by the antenna 143. As a result, the received signal can be transmitted via the existing transmission line (antenna cable 145). Therefore, the signal transmission line can be constructed more easily.

However, in terrestrial TV broadcasting, the frequency band (channel) used differs depending on the region. Therefore, the transmission band setting unit 263 scans the received signal (I signal and Q signal) processed by the signal processing unit 231 to detect the unused free band by the broadcast signal, and the available free band (detected). Part or all of the free band) is set as the transmission band of the received signal.

For example, as shown in FIG. 14, the transmission band setting unit 263 detects a signal level of 90 MHz to 770 MHz by 1 MHz, and when a signal of a predetermined level or higher is detected, detects the signal as a broadcast signal. .. In other words, the band in which no signal above a predetermined level is detected is detected as a free band. For example, when a broadcast signal is detected as in the example of FIG. 14 and a free band such as a shaded portion is detected, the transmission band setting unit 263 sets a part or all of the free band as a transmission band. To do. Since a certain amount of bandwidth (for example, 10 MHz) is required for transmission of the received signal, the transmission band setting unit 263 searches for a free band having a bandwidth equal to or greater than that bandwidth, and selects a part or all of the free band. Set as the transmission band.

The scanning (free band detection) method is arbitrary. For example, the frequency bandwidth for scanning is arbitrary. At least, scanning may be performed in a part or all of the transmittable band, which is the frequency band that can be transmitted in the existing equipment (transmission line). More specifically, for example, scanning may be performed at a part or all of 90MHz to 770MHz, or scanning may be performed at a part or all of 90MHz to 2150MHz, or 90MHz thereof. Scanning may be performed in part or all of a range wider than 90MHz to 2150MHz, including from 2150MHz. Further, the frequency interval for searching the signal level is arbitrary, and may be wider or narrower than 1 MHz. Also, this interval does not have to be constant.

The bandwidth used as the transmission band is arbitrarily set according to the specifications of the signal to be transmitted (specifications of communication with the transmitter 101). For example, when a maximum of 77 channels and a bandwidth of 13.8 MHz are required as a received signal, a bandwidth of 15 MHz may be secured as a transmission band. Of course, the bandwidth of the transmission band may be wider or narrower than this example.

The transmission band of the received signal may be set to a frequency band to which the broadcast signal is not assigned. For example, in the case of Japan, the broadcast signal is assigned as shown in FIG. 13, and there is a frequency band to which the broadcast signal is not assigned. However, existing equipment (transmission line) such as the antenna cable 145 is equipment for transmitting a broadcast signal, and transmission in a frequency band to which a broadcast signal is not assigned may not be guaranteed. For example, there is a possibility that an unnecessary frequency band to which a broadcast signal is not assigned is blocked by a filter or the like. Further, in the case of a country other than Japan, the frequency band to which the broadcast signal is assigned may be different from the example of FIG. Furthermore, even if the existing equipment (transmission line) is not for broadcast signals, there is no guarantee that the signal allocation will be the same as in the example of FIG.

Therefore, as described above, the transmission band setting unit 263 transmits the received signal by searching for a free band for a part or all of the transmittable band, which is the frequency band that can be transmitted in the existing equipment (transmission line). The transmission band that can be set can be set more reliably.

The transmission band of the received signal may be limited to the frequency band to which the broadcast signal is assigned as in the example of FIG. For example, the transmission band setting unit 263 may scan only within this frequency band and search for a free band within this frequency band.

The control signal processing unit 264 generates a control signal including information indicating the transmission band set by the transmission band setting unit 263, and via the signal processing unit 231 (bus 255, etc.), the distributor 151, the antenna cable 145, and the like. , Supply to the mixer 144. The mixer 144 frequency-converts the received signal into an empty band according to the control signal and supplies the received signal to the high-sensitivity receiver 154. Further, the signal processing unit 231 acquires the reception signal of the transmission band set by the transmission band setting unit 263. By doing so, the mixer 144 and the high-sensitivity receiver 154 transmit the received signal via the existing transmission line (antenna cable 145) regardless of the position (region) where the relay station 102 is installed. Can (send and receive). That is, the signal transmission line can be constructed more easily regardless of the area of the relay station 102.

<Flow of control processing>
An example of the flow of control processing executed in the relay station 102 of the position notification system 100 having the above configuration will be described with reference to the flowchart of FIG. The relay station 102 sets the transmission band of the received signal and transmits the received signal by performing the control process as shown in the flowchart of FIG.

The execution timing of this control process is arbitrary. For example, this control process may be executed when the antenna 143, the mixer 144, the distributor 151, the high-sensitivity receiver 154, etc. of the relay station 102 are newly installed or updated. .. Further, for example, it may be executed when the high-sensitivity receiver 154 is activated. Further, for example, it may be executed when a predetermined date and time arrives, or when some state change occurs.

When the control process is started, the transmission band setting unit 263 of the high-sensitivity receiver 154 scans and broadcasts a part or all of the transmittable band of the existing transmission line (for example, the antenna cable 145) in step S101. Detect the signal.

In step S102, the transmission band setting unit 263 sets a part or all of the free band, which is a frequency band in which the broadcast signal could not be detected by the process of step S101, as the transmission band of the received signal.

In step S103, the control signal processing unit 264 notifies the mixer 144 of the setting of the transmission band by transmitting the control signal to the mixer 144. Further, each processing unit of the signal processing unit 231 also reflects the setting of the transmission band.

The CPU 211 of the mixer 144 acquires the notification (control signal) in step S111. Further, in step S112, the CPU 211 sets the transmission band of the received signal according to the notification.

In step S113, the multiplication unit 196 frequency-converts the received signal supplied from the LNA 195 into its transmission band. The mixing unit 197 mixes the frequency-converted received signal with the broadcast signal and transmits it as a mixed signal. The transmitted mixed signal is transmitted to the distributor 151 via the antenna cable 145.

In step S104, the signal processing unit 231 of the high-sensitivity receiver 154 receives the mixed signal via the distributor 151, and generates the I signal and the Q signal of the received signal.

In step S105, the demodulation unit 265 performs processing such as demodulation on the received signals (I signal and Q signal) received by the processing of step S104, and acquires the information transmitted from the transmitter 101. This information is supplied to the server 104 via the network 103, for example, by the communication unit 266.

By performing the control process as described above, the relay station 102 can transmit the received signal by using the existing equipment. That is, the signal transmission line can be constructed more easily.

<Transmission band setting process flow>
An example of the flow of the transmission band setting process executed by the information processing unit 232 of the high-sensitivity receiver 154 in order to perform such a control process will be described with reference to the flowchart of FIG.

When the transmission band setting process is started, the transmission band setting unit 263 sets the signal level in a part or all of the transmittable band of the existing transmission line (for example, the antenna cable 145) in step S121, for example, at 1 MHz intervals. Measure. This process corresponds to the process of step S101 of FIG.

In step S122, the transmission band setting unit 263 determines whether or not there is a free band having a predetermined bandwidth or more based on the scan result. If it is determined that there is available free bandwidth, the process proceeds to step S123.

In step S123, the transmission band setting unit 263 sets the free band as the transmission band of the received signal. This process corresponds to the process of step S102 in FIG.

In step S124, the control signal processing unit 264 notifies the mixer 144 of the setting of the transmission band. For example, the control signal processing unit 264 generates a control signal including the setting of the transmission band, and supplies the control signal to the mixer 144. This process corresponds to the process of step S103 of FIG.

When the process of step S124 is completed, the transmission band setting process is completed. If it is determined in step S122 that there is no available free band, the process proceeds to step S125.

In step S125, the transmission band setting unit 263 performs a predetermined error process and ends the transmission band setting process. The content of this error handling is arbitrary.

By performing the transmission band setting process as described above, the high-sensitivity receiver 154 can more easily set the transmission band of the received signal so as not to interfere with other signals. Therefore, since the received signal can be transmitted more easily by using the existing equipment, the signal transmission line can be constructed more easily.

<2. Second Embodiment>
<Transmission band setting using GNSS signal>
In the first embodiment, the transmission band is set by scanning the transmittable band, but the method of setting the transmission band is not limited to this example. For example, the transmission band may be set based on the channel information of the broadcast signal for each region according to the position information obtained from the GNSS signal or the like.

<Relay station>
FIG. 17 shows a main configuration example of the relay station 102 and the like in this case. In the case of the example of FIG. 17, the relay station 102 basically has the same configuration as that of the example of FIG. 3, but in the case of the example of FIG. 17, a GNSS antenna 281 is further provided.

The GNSS antenna 281 receives a GNSS signal transmitted from the GNSS satellite 282, which is an artificial satellite of the global positioning system. The high-sensitivity receiver 154 acquires the GNSS signal received by the GNSS antenna 281.

The high-sensitivity receiver 154 obtains its own position information based on the GNSS signal, and obtains information on the free band in the area corresponding to the position information. Then, the high-sensitivity receiver 154 sets a part or all of the free band as the transmission band of the received signal.

By doing so, the high-sensitivity receiver 154 can grasp the free band without scanning and set it as the transmission band of the received signal.

<High-sensitivity receiver>
A main configuration example of the high-sensitivity receiver 154 in this case is shown in FIG. The high-sensitivity receiver 154 in this case has basically the same configuration as the case described with reference to FIG. 9, but the information processing unit 232 further includes a GNSS signal processing unit 291.

The GNSS signal processing unit 291 performs processing related to the GNSS signal received via the GNSS antenna 281. For example, the GNSS signal processing unit 291 receives a GNSS signal via the GNSS antenna 281. Further, for example, the GNSS signal processing unit 291 uses the GNSS signal to obtain position information (coordinates, etc.) of the high-sensitivity receiver 154.

The communication unit 266 supplies the position information to the server 104 via the network 103, and acquires the free band information (information indicating which frequency band is the free band) corresponding to the position information from the server 104. To do. For example, the server 104 stores information on the free band for each area in advance, and when the position information is supplied from the communication unit 266, the information on the free band in the area corresponding to the position information is transmitted to the communication unit 266. It may be supplied.

The transmission band setting unit 263 sets a part or all of the free band as the transmission band based on the information of the free band.

Therefore, the high-sensitivity receiver 154 can grasp the free band and set it as the transmission band of the received signal without performing scanning.

The communication unit 266 may acquire the channel information (that is, the frequency distribution of the broadcast signal) corresponding to the supplied position information instead of the free band information. For example, the server 104 stores the channel information for each region in advance, and when the location information is supplied from the communication unit 266, the channel information of the region corresponding to the location information is supplied to the communication unit 266. You may. In this case, the transmission band setting unit 263 obtains a free band based on the channel information, and sets a part or all of the free band as a transmission band.

Further, the position information (coordinates, etc.) of the high-sensitivity receiver 154 may be obtained by an external device (for example, server 104, etc.) of the high-sensitivity receiver 154. In that case, the communication unit 266 supplies the GNSS signal received by the GNSS signal processing unit 291 to, for example, the server 104 via the network 103. The server 104 uses the GNSS signal to obtain the position information of the high-sensitivity receiver 154. The server 104 may supply the position information to the high-sensitivity receiver 154, generate information on the free band corresponding to the position information, and supply the information on the free band to the high-sensitivity receiver 154. You may try to do it.

Further, the calculation of such position information (coordinates, etc.) may be performed manually by a device (other server) other than the server 104. For example, a dedicated server for obtaining the position information (coordinates, etc.) of the high-sensitivity receiver 154 may be prepared.

<Server>
FIG. 19 is a block diagram showing a main configuration example of the server 104. As shown in FIG. 19, the server 104 includes a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, a RAM (Random Access Memory) 303, a bus 304, an input / output interface 310, an input unit 311 and an output unit. It has 312, a storage unit 313, a communication unit 314, and a drive 315.

The CPU 301, ROM 302, and RAM 303 are connected to each other via the bus 304. The input / output interface 310 is also connected to the bus 304. The input unit 311 to the drive 315 are connected to the input / output interface 310.

The input unit 311 has an arbitrary input device such as a keyboard, a mouse, a touch panel, an image sensor, a microphone, a switch, and an input terminal. The output unit 312 has an arbitrary output device such as a display, a speaker, and an output terminal. The storage unit 313 has an arbitrary storage medium such as a hard disk, a RAM disk, a non-volatile memory such as an SSD (Solid State Drive) or a USB (Universal Serial Bus) memory, and the like. The communication unit 314 is an arbitrary communication standard of wired or wireless, or both, such as Ethernet (registered trademark), Bluetooth (registered trademark), USB, HDMI (registered trademark) (High-Definition Multimedia Interface), IrDA, etc. Has a communication interface. The drive 315 drives a removable medium 321 having an arbitrary storage medium such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

In the server 104 configured as described above, the CPU 301 loads the program stored in the ROM 302 or the storage unit 313 into the RAM 303 and executes the program, thereby performing the above-mentioned series of processes. The RAM 303 also appropriately stores data and the like necessary for the CPU 301 to execute various processes.

Further, the program executed by the server 104 (CPU301) can be recorded and applied to the removable media 321 as a package media or the like, for example. In that case, the program can be installed in the storage unit 313 via the input / output interface 310 by mounting the removable media 321 in the drive 315.

The program can also be provided via wired or wireless transmission media such as local area networks, the Internet, and digital satellite broadcasting. In that case, the program can be received by the communication unit 314 and installed in the storage unit 313.

In addition, this program can be pre-installed in the ROM 302 or the storage unit 313.

<Flow of control processing>
An example of the flow of control processing in this case will be described with reference to the flowchart of FIG. When the control process is started, the GNSS signal processing unit 291 of the high-sensitivity receiver 154 receives the GNSS signal transmitted from the GNSS satellite 282 via the GNSS antenna 281 in step S141, and uses the GNSS signal. Get location information. In step S142, the communication unit 266 supplies the position information to the server 104.

In step S151, the communication unit 314 of the server 104 acquires the position information. In step S152, the CPU 301 of the server 104 searches for a free band according to the position of the high-sensitivity receiver 154 based on the position information. In step S153, the communication unit 314 supplies the high-sensitivity receiver 154 with information indicating the searched free band (free band corresponding to the position information).

In step S143, the communication unit 266 of the high-sensitivity receiver 154 acquires information indicating the free band. In step S144, the transmission band setting unit 263 sets a part or all of the free band as the transmission band of the received signal based on the information indicating the free band.

Subsequent processing is executed in the same manner as in the case of FIG. That is, each process of steps S145 to S147 of FIG. 20 is executed in the same manner as each process of steps S103 to S105 of FIG. Further, each process of steps S161 to S163 of FIG. 20 is executed in the same manner as each process of steps S111 to S113 of FIG.

By performing the control process as described above, the relay station 102 can set the transmission band without performing scanning. That is, the relay station 102 can transmit the received signal by using the existing equipment as in the case described above in the first embodiment. That is, the signal transmission line can be constructed more easily.

<Transmission band setting process flow>
An example of the flow of the transmission band setting process in this case will be described with reference to the flowchart of FIG.

When the transmission band setting process is started, the GNSS signal processing unit 291 receives the GNSS signal in step S181, and obtains the position information of the high-sensitivity receiver 154 using the GNSS signal in step S182. These processes correspond to the processes of step S141 of FIG.

In step S183, the communication unit 266 supplies the position information of the high-sensitivity receiver 154 to the server 104, and causes the server 104 to search for the free band corresponding to the position information. In step S184, the communication unit 266 determines whether or not the free band information corresponding to the supplied position information has been acquired, and waits until it is determined that the information has been acquired. If it is determined that the free band information has been acquired, the process proceeds to step S185. These processes correspond to the processes of steps S142 and S143 of FIG.

In step S185, the transmission band setting unit 263 sets a part or all of the free band corresponding to the position information of the high-sensitivity receiver 154 as the transmission band of the received signal based on the acquired free band information. This process corresponds to the process of step S144 of FIG.

In step S186, the control signal processing unit 264 transmits the transmission band setting of the received signal to the mixer 144 as a control signal (notifies the transmission band setting). This process corresponds to the process of step S145 of FIG.

When the process of step S186 is completed, the transmission band setting process is completed.

By performing the transmission band setting process as described above, the high-sensitivity receiver 154 can set the transmission band without scanning. That is, the high-sensitivity receiver 154 can more easily set the transmission band of the received signal so as not to interfere with other signals, as in the case described above in the first embodiment. Therefore, since the received signal can be transmitted more easily by using the existing equipment, the signal transmission line can be constructed more easily.

The high-sensitivity receiver 154 may be able to obtain a free band according to the position of the high-sensitivity receiver 154. For example, when the memory 262 or the like stores information on the free band for each region in advance and the position information is obtained by the GNSS signal processing unit 291, the transmission band setting unit 263 is obtained by the GNSS signal processing unit 291. The free band information of the area corresponding to the position information may be read from the memory 262. In this case, the transmission band setting unit 263 further sets a part or all of the free band as the transmission band based on the information of the free band.

That is, in this case, the high-sensitivity receiver 154 can set the transmission band of the received signal using the GNSS signal without accessing an external device such as the server 104.

<3. Third Embodiment>
<Adjusting the gain of the received signal>
FIG. 22 shows an example of the state of the mixed signal transmitted to the high-sensitivity receiver 154. For example, when the signal level of the received signal received by the antenna 143 is smaller than the signal level of other broadcast signals, the signal level of the mixed signal transmitted to the high-sensitivity receiver 154 is shown in FIG. 22A. It will be like that. In FIG. 22, the vertical direction in the figure shows an example of the signal level, and the horizontal direction in the figure shows an example of the frequency band. The shaded area in the figure indicates the signal level of the received signal. As shown by the dotted line and the double-headed arrow, if the difference in signal level between the received signal and the broadcast signal is large, the required performance on the receiver side is significantly increased, and the cost may increase.

Further, for example, when the signal level of the terrestrial broadcast signal is smaller than the signal level of the received signal or the broadcast signal of satellite broadcasting, the signal level of the mixed signal transmitted to the high-sensitivity receiver 154 is shown in FIG. It will be as shown in B. Also in this case, as shown by the dotted line and the double-headed arrow, the difference in signal level between the received signal and the broadcast signal is large, and the required performance on the receiver side is significantly increased as in the case of A in FIG. The cost may increase.

Therefore, the mixer 144 is provided with an amplification unit having a variable amplification factor for amplifying the received signal so that the signal level of the received signal can be controlled. Here, the amplification factor includes a value less than 1 time. That is, amplification includes not only increasing the signal level but also decreasing it.

More specifically, for example, the high-sensitivity receiver 154 is provided with a gain setting unit for setting the gain amount of the signal level of the received signal. Further, for example, the high-sensitivity receiver 154 notifies the mixer 144 of the setting of the gain amount. Further, for example, the mixer 144 is made to acquire information regarding the setting of the amount of gain supplied. Further, for example, the amplification unit of the mixer 14 may amplify the received signal with a gain amount according to the information regarding the acquisition of the gain amount setting.

By doing so, it is possible to suppress the difference in signal level between the received signal and the broadcast signal, so that it is possible to suppress an increase in required performance and an increase in cost of the high-sensitivity receiver 154 and the like.

<Mixer>
FIG. 23 shows a main configuration example of the mixer 144 in this case. The mixer 144 in this case has basically the same configuration as the case described with reference to FIG. 7, but further has an amplification unit 331 between the LNA 195 and the multiplication unit 196. The amplification unit 331 further amplifies the received signal amplified by the LNA 195. The amplification factor of the amplification unit 331 is variable and is controlled by the CPU 211. The CPU 211 controls the amplification factor (gain) of the amplification unit 331 based on the gain setting information included in the control signal acquired via the distribution unit 199.

<High-sensitivity receiver>
FIG. 24 shows a main configuration example of the high-sensitivity receiver 154 in this case. The high-sensitivity receiver 154 in this case has basically the same configuration as the case described with reference to FIG. 9, but the information processing unit 232 further includes a gain setting unit 332.

The gain setting unit 332 sets the gain (amplification rate) of the amplification unit 331. This setting method is arbitrary. For example, it may be set based on the mixed signal supplied to the high-sensitivity receiver 154, it may be set to a predetermined value, or it may be set according to other conditions. It may be.

The control signal processing unit 264 generates a control signal including the gain setting information generated by the gain setting unit 332, and uses it as a bus 260, a bus 233, a bus 255, a switching unit 241, a distributor 151, an antenna cable 145, and the like. Is transmitted to the mixer 144 via.

<Flow of control processing>
An example of the flow of control processing in this case will be described with reference to the flowchart of FIG. The processes of steps S201 to S203 of FIG. 25 are executed in the same manner as the processes of steps S101 to S103 of FIG. Further, each process of step S211 and step S212 of FIG. 25 is executed in the same manner as each process of step S111 and step S112 of FIG.

In step S204 of FIG. 25, the gain setting unit 332 measures the signal level of the mixed signal (that is, the signal level of each broadcast signal and the signal level of the received signal) so as to reduce the difference between the signal levels. Set the gain amount (amplification rate) of the received signal.

In step S205, the control signal processing unit 264 supplies the setting of the gain amount to the mixer 144 as a control signal (notifies the gain).

In step S213, the CPU 211 of the mixer 144 acquires the control signal and sets the gain amount (amplification rate) of the amplification unit 331 according to the setting of the gain amount included in the control signal. Therefore, when transmitting the received signal, the received signal is amplified by the amplification unit 331 with a set gain amount and transmitted. That is, the signal level difference from the broadcast signal is suppressed.

Subsequent processing is executed in the same manner as in the case of FIG. That is, each process of step S206 and step S207 of FIG. 25 is executed in the same manner as each process of step S104 and step S105 of FIG. Further, the process of step S214 of FIG. 25 is executed in the same manner as the process of step S113 of FIG.

By performing the control processing as described above, the relay station 102 can suppress the difference in signal level between the received signal and the broadcast signal, and can suppress the increase in cost. Further, the relay station 102 can transmit the received signal by using the existing equipment as in the case described above in the first embodiment. That is, the signal transmission line can be constructed more easily.

<Flow of gain setting process>
An example of the flow of the gain setting process executed by the gain setting unit 332 or the like of the high-sensitivity receiver 154 in order to perform such a control process will be described with reference to the flowchart of FIG.

When the gain setting process is started, the gain setting unit 332 detects the signal level of the broadcast signal or the received signal in the mixed signal transmitted from the mixer 144 in step S231.

In step S232, the gain setting unit 332 sets the gain amount (amplification rate) of the amplification unit 331 according to the difference in signal level between the broadcast signal and the reception signal (so as to reduce the difference).

In step S233, the control signal processing unit 264 supplies the gain setting to the mixer 144 as a control signal (notifies the gain setting). When the process of step S233 is completed, the gain setting process is completed.

By performing the gain setting process as described above, the high-sensitivity receiver 154 can suppress the difference in signal level between the broadcast signal and the received signal.

The transmission band setting process may be executed in the same manner as in the case described in the first embodiment (example of FIG. 16). Therefore, in this case as well, the high-sensitivity receiver 154 can more easily set the transmission band of the received signal so as not to interfere with other signals, as in the case described above in the first embodiment. Therefore, since the received signal can be transmitted more easily by using the existing equipment, the signal transmission line can be constructed more easily.

In the above, the transmission band setting unit 263 has been described so as to scan the transmittable band and set the transmission band as in the case described in the first embodiment, but the present invention is not limited to this. The transmission band may be set by using the GNSS signal as in the case described in the second embodiment.

<4. Fourth Embodiment>
<High-sensitivity transmitter / receiver>
In the above, the relay station 102 has been described as receiving the signal from the terminal (transmitter 101), but the relay station 102 may be able to transmit the signal to the terminal.

FIG. 27 shows a main configuration example of the relay station 102 in that case. In the example of FIG. 27, the relay station 102 has basically the same configuration as that of FIG. 3, but has a high-sensitivity transmitter / receiver 341 instead of the high-sensitivity receiver 154.

The high-sensitivity transmitter / receiver 341 can transmit a wireless signal to the high-sensitivity transmitter / receiver 342, which is a terminal, or receive a wireless signal transmitted from the high-sensitivity transmitter / receiver 342 via the antenna 143.

That is, in this case, not only the received signal and the control signal but also the transmission signal (transmission information) transmitted from the high-sensitivity transmitter / receiver 341 to the high-sensitivity transmitter / receiver 342 is transmitted to the antenna cable 145 or the like which is an existing facility. To. In the case of such bidirectional communication, by applying the present technology, the existing equipment can be used more easily as in the case of each of the above-described embodiments. That is, the signal transmission line can be constructed more easily.

<Mixer>
FIG. 28 shows a main configuration example of the mixer in this case. The mixer 144 in this case has basically the same configuration as the case described with reference to FIG. 7, but further has a switching unit 351 on the antenna 143 side of the SAW filter 194. Further, a signal transmission unit 352 is provided between the switching unit 351 and the CPU 211.

The switching unit 351 switches the configuration for connecting to the antenna 143 depending on whether the signal is transmitted or received. For example, when receiving a signal, the switching unit 351 connects the SAW filter 194 to the antenna 143. Further, for example, when transmitting a signal, the switching unit 351 connects the signal transmitting unit 352 to the antenna 143. This switching is controlled by the CPU 211.

Based on the control of the CPU 211, the signal transmission unit 352 converts the transmission information supplied from the CPU 211 into a transmission signal, supplies the transmission signal to the antenna 143 via the switching unit 351 and transmits the transmission information as a wireless signal. The signal transmission unit 352 has a PLL 353, an oscillation unit 354, and an amplification unit 355.

The transmission information to be transmitted to the high-sensitivity transmitter / receiver 342 is generated by the high-sensitivity transmitter / receiver 341 and transmitted to the mixer 144 via the antenna cable 145. That is, this transmission information is superimposed on the broadcast signal and the received signal and transmitted as a signal in a predetermined frequency band. That is, this transmission information is transmitted as a signal in a frequency band that does not interfere with the mixed signal.

This transmission information is extracted by the distribution unit 199 and supplied to the CPU 211. Before the transmission information is transmitted, the CPU 211 is notified by the control signal of the setting of the transmission band of the transmission information from the high-sensitivity transmitter / receiver 341, as in the case of the transmission band of the reception signal. When the CPU 211 acquires the control signal, the CPU 211 reflects the setting of the transmission band of the transmission information in the distribution unit 199. As a result, the distribution unit 199 can extract the transmission information transmitted from the high-sensitivity transmitter / receiver 341 and supply it to the CPU 211.

The CPU 211 supplies the supplied transmission information to the PLL 353. Further, the CPU 211 controls the oscillating unit 354 and oscillates at, for example, 925 MHz to generate a carrier signal. This carrier signal is modulated according to the output from the PLL 353, that is, the transmission information, and a transmission signal is generated. The amplification unit 355 amplifies the transmission signal and supplies it to the switching unit 351.

When the transmission information is supplied, the CPU 211 controls the switching unit 351 to connect the signal transmission unit 352 (amplification unit 355) to the antenna 143. Therefore, the output of the amplification unit 355 is transmitted as a radio signal from the antenna 143.

<High-sensitivity transmitter / receiver>
FIG. 29 is a diagram showing a main configuration example of the high-sensitivity transmitter / receiver 341. The high-sensitivity transmitter / receiver 341 has basically the same configuration as the high-sensitivity receiver 154 described with reference to FIG. 9, but the information processing unit 232 further includes a transmission information generation unit 361.

The transmission information generation unit 361 generates transmission information which is information to be transmitted to the high-sensitivity transmitter / receiver 342. The content of this information is arbitrary. Therefore, the transmission information generation unit 361 may have any configuration and how the transmission information may be generated. For example, the transmission information generation unit 361 may have the same configuration as the pseudo-random number sequence generation unit 161 (FIG. 4) of the transmitter 101, and may generate a similar pseudo-random number sequence PN as transmission information.

Further, the transmission information generation unit 361 transmits the generated transmission information to the mixer 144 via the bus 260, the bus 233, the bus 255, the switching unit 241, the distributor 151, the antenna cable 145, and the like. As described above, since the transmission information is transmitted through the same transmission line as the mixed signal, it is transmitted in a frequency band different from that of the broadcast signal and the received signal.

That is, in this case, the transmission band setting unit 263 sets not only the transmission band of the received signal but also the transmission band of the transmission information. At that time, the transmission band setting unit 263 sets the transmission band of the received signal and the transmission band of the transmission information to different free bands, for example, as in the example shown in FIG. The method of setting the transmission band of the transmission information is the same as that of the received signal. The free band may be detected by scanning as described in the first embodiment, or the free band may be obtained by using the GNSS signal as described in the second embodiment. May be good.

The bandwidth of the transmission band of the transmission information is arbitrary and does not have to be the same as the bandwidth of the transmission band of the received signal. The bandwidth used as the transmission band is arbitrarily set according to the specifications of the transmitted signal (specifications of communication with the high-sensitivity transmitter / receiver 342), as in the case of the transmission band of the received signal. For example, when a maximum of 77 channels and a bandwidth of 13.8 MHz are required as a transmission signal, a bandwidth of 15 MHz may be secured as a transmission band. Of course, the bandwidth of the transmission band may be wider or narrower than this example.

The transmission information generation unit 361 frequency-converts the generated transmission information and transmits it to the mixer 144 as a signal in the transmission band of the transmission information.

By doing so, not only the received signal but also the transmission information can be transmitted (transmitted / received) via the existing transmission line (antenna cable 145). That is, it is possible to more easily construct a signal transmission line capable of bidirectional information transmission.

The configuration of the high-sensitivity transmitter / receiver 342 is arbitrary. For example, the transmitter 101 shown in FIG. 4 may be configured to transmit a signal, and the signal processing unit 231 shown in FIG. 9 may be configured to receive the signal.

<Flow of control processing>
An example of the flow of control processing in this case will be described with reference to the flowchart of FIG. The processes of steps S251 and S252 of FIG. 31 are executed in the same manner as the processes of steps S101 and S102 of FIG. That is, in step S251, the transmission band setting unit 263 of the high-sensitivity receiver 154 scans a part or all of the transmittable band of the existing transmission line (for example, the antenna cable 145) to detect the broadcast signal, and is free. Detect the band. Then, in step S252, the transmission band setting unit 263 sets a part of the free band as the transmission band of the received signal.

In step S253, the transmission band setting unit 263 of the high-sensitivity receiver 154 sets the other part of the free band as the transmission band of the transmission information.

In step S254, the control signal processing unit 264 notifies the mixer 144 of the setting of the transmission band of the received signal and the setting of the transmission band of the transmission information by transmitting the control signal to the mixer 144. Further, each processing unit of the signal processing unit 231 also reflects the setting of the transmission band. Further, the transmission information generation unit 361 is also notified of the information.

The CPU 211 of the mixer 144 acquires the notification (control signal) in step S261. Further, in step S262, the CPU 211 sets the transmission band of the received signal according to the notification. The CPU 211 also sets the transmission band of the transmission information according to the notification.

The process of step S263 of FIG. 31 is executed in the same manner as the process of step S113 of FIG. Further, each process of step S255 and step S256 of FIG. 31 is executed in the same manner as each process of step S104 and step S105 of FIG.

In step S257 of FIG. 31, the transmission information generation unit 361 generates transmission information. In step S258, the transmission information generation unit 361 frequency-converts the transmission information into the transmission band of the transmission information and transmits the transmission information, and transmits the transmission information to the mixer 144 via the antenna cable 145 or the like.

In step S264, the CPU 211 of the mixer 144 receives the transmission information signal transmitted from the high-sensitivity transmitter / receiver 341 in the transmission information transmission band. In step S265, the signal transmission unit 352 frequency-converts the transmission information into the 920 MHz band to obtain a transmission signal, and transmits the transmission information from the antenna 143 as a radio signal.

By performing the control process as described above, the relay station 102 can transmit not only the received signal but also the transmission information by using the existing equipment. That is, it is possible to more easily construct a signal transmission line capable of bidirectional information transmission.

<Transmission band setting process flow>
An example of the flow of the transmission band setting process in this case will be described with reference to the flowchart of FIG.

The processes of steps S281 and S282 of FIG. 32 are executed in the same manner as the processes of steps S121 and S122 of FIG.

In step S283, the transmission band setting unit 263 sets a part of the detected free band as the transmission band of the received signal. This process corresponds to the process of step S252 in FIG. In step S284, the transmission band setting unit 263 sets the other part of the detected free band as the transmission band of the transmission information. This process corresponds to the process of step S253 in FIG.

In step S285, the control signal processing unit 264 notifies the mixer 144 of the setting of the transmission band of the received signal and the setting of the transmission band of the transmission information. For example, the control signal processing unit 264 generates a control signal including the setting of those transmission bands, and supplies the control signal to the mixer 144. This process corresponds to the process of step S254 of FIG.

When the process of step S285 is completed, the transmission band setting process is completed. If it is determined in step S282 that there is no available free band, the process proceeds to step S286.

In step S286, the transmission band setting unit 263 performs a predetermined error process and ends the transmission band setting process. The content of this error handling is arbitrary.

By performing the transmission band setting process as described above, the high-sensitivity receiver 154 can more easily set the transmission band of the received signal and the transmission band of the transmission information so as not to interfere with other signals. it can. Therefore, it is possible to more easily transmit not only the received signal but also the transmitted information by using the existing equipment. That is, it is possible to more easily construct a signal transmission line capable of bidirectional information transmission.

<5. Fifth Embodiment>
<Spectrum diffusion of control signal>
In the above, the control signal transmitted from the high-sensitivity receiver 154 to the mixer 144 has been described as being transmitted as a signal having a predetermined frequency, but the control signal is not limited to this, and the control signal is the transmittable band of the existing equipment. The spectrum may be spread over the entire or a part of the band for transmission. For example, as shown in the example of FIG. 33, the control signal is spread over 90 MHz to 770 MHz, which is the band in which the broadcast signal (VHF / UHF signal) of terrestrial TV broadcasting is transmitted. May be good.

By spreading the spectrum in this way, the control signal can be transmitted at a signal level sufficiently lower than the broadcast signal, and the influence on the TV receiver 153 can be reduced. For example, when the TV receiver 153 communicates with the satellite antenna 142, a signal of several kHz is superimposed on the DC component and transmitted, but by spreading the spectrum of the control signal as described above, the influence on the signal is also suppressed. be able to.

<Mixer>
A main configuration example of the mixer 144 in this case is shown in FIG. The mixer 144 in this case has basically the same configuration as the case described with reference to FIG. 7, but has an ADC 371 and a spectral back diffusion processing unit 372 between the distribution unit 199 and the CPU 211. The distribution unit 199 supplies the spectrum-spread control signal to the ADC 371. The ADC 371 A / D-converts the spectrum-spread control signal. The spectrum despreading processing unit 372 spectrum despreads the spectrum-spreaded control signal of the digital data to restore the control signal and supplies the control signal to the CPU 211. The CPU 211 performs various controls based on the content of the control signal.

<High-sensitivity receiver>
FIG. 35 shows a main configuration example of the high-sensitivity receiver 154 in this case. The high-sensitivity receiver 154 in this case has basically the same configuration as the case described with reference to FIG. 9, but the signal processing unit 231 further includes a spectrum diffusion unit 381 on the bus 255.

The spectrum spreading unit 381 spreads the control signal transmitted via the bus 255 in a predetermined frequency band. The spectrum diffusion unit 381 has an oscillation unit 382, a multiplication unit 383, and an amplification unit 384. The oscillating unit 382 transmits in a predetermined frequency band. The multiplication unit 383 multiplies the control signal by the oscillation signal transmitted in a predetermined frequency band to spread the spectrum. The amplification unit 384 amplifies the control signal whose spectrum has been diffused as described above, adjusts the gain, and transmits the control signal via the switching unit 241. As described above, this spectrum-spread control signal is transmitted to the mixer 144 via an existing transmission line such as the antenna cable 145.

<Flow of control processing>
An example of the flow of control processing in this case will be described with reference to the flowchart of FIG. The processes of step S301 and step S302 of FIG. 36 are executed in the same manner as the processes of step S101 and step S102 of FIG.

In step S303, the control signal processing unit 264 transmits the setting of the transmission band of the received signal as a control signal. The spectrum diffusion unit 381 spreads the control signal and transmits the control signal.

The distribution unit 199 of the mixer 144 supplies the spectrum-spread control signal transmitted from the high-sensitivity receiver 154 to the ADC 371. The ADC 371 A / D-converts the spectrum-spread control signal. The spectrum back-diffusion processing unit 372 recovers the control signal by spectrally back-spreading the spectrum-spread control signal. The CPU 211 acquires the setting of the transmission band of the received signal included in the control signal.

The processes of steps S312 and S313 of FIG. 36 are executed in the same manner as the processes of steps S112 and S113 of FIG. Further, each process of step S304 and step S305 of FIG. 36 is executed in the same manner as each process of step S104 and step S105 of FIG.

<Transmission band setting process flow>
An example of the flow of the transmission band setting process in this case will be described with reference to the flowchart of FIG. 37.

The processes of steps S331 to S333 and step S335 of FIG. 37 are executed in the same manner as the processes of steps S121 to S123 and step S125 of FIG.

In step S334, the control signal processing unit 264 transmits the setting of the transmission band of the received signal as a control signal. The spectrum diffusion unit 381 spreads the control signal and transmits the control signal. This process corresponds to the process of step S303 of FIG.

By spreading the spectrum of the control signal as described above, the control signal can be transmitted at a signal level sufficiently lower than the broadcast signal, and the influence on the TV receiver 153 can be reduced.

<6. 6th Embodiment>
<Use of information on TV receivers>
Further, the information on the free band for setting the transmission band may be obtained by using, for example, the channel information which is the frequency distribution of the broadcast signal possessed by the TV receiver 153.

The TV receiver 153 indicates which channel is effective in the area in order to receive the broadcast signal of each broadcast station, that is, which frequency band the broadcast signal of each broadcast station uses (). It has channel information).

Therefore, for example, as shown in FIG. 38, the high-sensitivity receiver 154 accesses the TV receiver 153 to acquire the channel information stored in the TV receiver 153 (dotted arrow 391), and the channel is obtained. The transmission band may be set using the information.

<High-sensitivity receiver>
FIG. 39 shows a main configuration example of the high-sensitivity receiver 154 in this case. The high-sensitivity receiver 154 in this case has basically the same configuration as the case described with reference to FIG. 9, but the information processing unit 232 further includes a channel information acquisition unit 392.

The channel information acquisition unit 392 acquires channel information from the TV receiver 153 via the communication unit 266. The transmission band setting unit 263 sets the transmission band of the received signal using the channel information acquired by the channel information acquisition unit 392.

Therefore, also in this case, the high-sensitivity receiver 154 can grasp the free band and set it as the transmission band of the received signal without scanning and further using the GNSS signal.

The configuration of the TV receiver 153 is arbitrary. The TV receiver 153 may have a configuration capable of storing channel information in the area and communicating with the high-sensitivity receiver 154.

<Flow of control processing>
An example of the flow of control processing in this case will be described with reference to the flowchart of FIG. When the control process is started, the channel information acquisition unit 392 of the high-sensitivity receiver 154 acquires the channel information from the TV receiver 153 via the communication unit 266 in step S351. In step S352, the transmission band setting unit 263 obtains a free band using the channel information acquired by the channel information acquisition unit 392, and sets a part or all of the free band as the transmission band of the received signal.

The processes of steps S353 to S355 of FIG. 40 are executed in the same manner as the processes of steps S103 to S105 of FIG. Further, each process of steps S361 to S363 of FIG. 40 is executed in the same manner as each process of steps S111 to S113 of FIG.

By performing the control process as described above, the relay station 102 can set the transmission band without scanning and further without using the GNSS signal. That is, the relay station 102 can transmit the received signal by using the existing equipment as in the case described above in the first embodiment. That is, the signal transmission line can be constructed more easily.

<Transmission band setting process flow>
An example of the flow of the transmission band setting process in this case will be described with reference to the flowchart of FIG.

When the transmission band setting process is started, the channel information acquisition unit 392 of the high-sensitivity receiver 154 acquires the channel information from the TV receiver 153 via the communication unit 266 in step S381. This process corresponds to the process of step S351 in FIG. 40.

Based on the channel information, each process of steps S382 to S385 of FIG. 41 is executed in the same manner as each process of steps S122 to S125 of FIG.

By performing the transmission band setting process as described above, the high-sensitivity receiver 154 can set the transmission band without scanning and further without using the GNSS signal. That is, the high-sensitivity receiver 154 can more easily set the transmission band of the received signal so as not to interfere with other signals, as in the case described above in the first embodiment. Therefore, since the received signal can be transmitted more easily by using the existing equipment, the signal transmission line can be constructed more easily.

<7. Seventh Embodiment>
<Other signal transmission / reception systems>
In the above, the position notification system 100 has been described as an example, but the present technology can be applied to systems other than the above-mentioned position notification system 100. For example, the transmitter 101 may be installed not only on a person but also on a moving body or the like.

For example, the present technology can also be applied to an anti-theft system 410 for preventing theft of automobiles, motorcycles, etc. as shown in FIG. 42. In the case of the anti-theft system 410, the transmitter 101 is installed on an object whose position is monitored by the user, for example, a car 411 or a motorcycle 412 owned by the user. As in the case of the position notification system 100, the transmitter 101 appropriately notifies the relay station 102 of its own position information (that is, the position information of the automobile 411 and the motorcycle 412). That is, the user can access the server 104 from the terminal device 105 and grasp the positions of the automobile 411 and the motorcycle 412, as in the case of the position notification system 100. Therefore, the user can grasp the position of the automobile 411 or the motorcycle 412 even if the vehicle is stolen, so that the automobile 411 or the motorcycle 412 can be easily recovered.

In the case of such an anti-theft system 410, the present technology can be applied to the relay station 102 as in the case of the position notification system 100. Then, by applying this technology, it is possible to suppress an increase in power consumption of a device (for example, a high-sensitivity receiver 154 or the like) constituting the relay station 102.

Further, the information transmitted and received is also arbitrary and is not limited to the above-mentioned position information. For example, the transmission information generation unit 171 of the transmitter 101 can generate transmission information including arbitrary information. For example, the transmission information generation unit 171 may generate transmission information including images, sounds, measurement data, identification information of devices and the like, parameter setting information, control information such as commands, and the like. Of course, information other than these examples may be included. Further, the transmission information may include a plurality of types of information such as images and sounds, identification information, setting information, control information, and the like.

Further, for example, the transmission information generation unit 171 may generate transmission information including information supplied from another device. For example, the transmission information generator 171 can perform image, light, brightness, saturation, electricity, sound, vibration, acceleration, velocity, angular velocity, force, temperature (not temperature distribution), humidity, distance, area, volume, shape, Generate transmission information including information (sensor output) output from various sensors that detect or measure an arbitrary variable such as flow rate, time, time, magnetism, chemical substance, or odor, or the amount of change thereof. You may do so.

That is, this technology is not limited to the system that notifies the position information as described above, for example, three-dimensional shape measurement, spatial measurement, object observation, moving deformation observation, biological observation, authentication processing, monitoring, autofocus, imaging control. , Lighting control, tracking processing, input / output control, electronic device control, actuator control, etc., can be applied to a system used for any purpose.

In addition, this technology can be applied to systems in any field such as transportation, medical care, crime prevention, agriculture, livestock industry, mining, beauty, factories, home appliances, weather, and nature monitoring. For example, the present technology can also be applied to a system for capturing an image used for viewing, which uses a digital camera, a portable device having a camera function, or the like. In addition, for example, this technology monitors an in-vehicle system that photographs the front, rear, surroundings, interior of a vehicle, etc., a traveling vehicle, and a road for safe driving such as automatic stop and recognition of the driver's condition. It can also be applied to systems used for traffic such as surveillance camera systems for driving and distance measuring systems for measuring distances between vehicles. Further, for example, the present technology can be applied to a system used for security, which uses a surveillance camera for crime prevention, a camera for personal authentication, and the like. Further, for example, the present technology can be applied to a system used for sports, which uses various sensors and the like that can be used for sports applications such as wearable cameras. Further, for example, the present technology can be applied to a system used for agriculture, which uses various sensors such as a camera for monitoring the state of fields and crops. Further, for example, the present technology can be applied to a system used for the livestock industry, which uses various sensors for monitoring the condition of livestock such as pigs and cattle. Furthermore, this technology includes systems that monitor natural conditions such as volcanoes, forests, and oceans, meteorological observation systems that observe weather, temperature, humidity, wind speed, and sunshine time, and, for example, birds, fish, and reptiles. It can also be applied to systems for observing the ecology of wildlife such as species, amphibians, mammals, insects, and plants.

Furthermore, the specifications of the radio signals and information transmitted and received are arbitrary. That is, the present technology can be applied to an arbitrary signal transmission / reception system (any device constituting the system) for transmitting / receiving signals using an existing transmission line.

<Computer>
The series of processes described above can be executed by hardware or by software. When a series of processes are executed by software, for example, the transmission information generation unit 171 of the transmitter 101 (may include a part or all of the other processing units), the CPU 211 of the mixer 144 (a part of the other processing units). Or all of them may be included), and the signal processing unit 231 and the information processing unit 232 (each of these processing units) of the high-sensitivity receiver 154 have a configuration as a computer capable of executing the software. You can do it like this. This computer includes, for example, a computer embedded in dedicated hardware, a general-purpose computer capable of executing an arbitrary function by installing various programs, and the like.

FIG. 43 is a block diagram showing a configuration example of hardware of a computer that executes the above-mentioned series of processes programmatically.

In the computer 600 shown in FIG. 43, the CPU (Central Processing Unit) 611, the ROM (Read Only Memory) 612, and the RAM (Random Access Memory) 613 are connected to each other via the bus 614.

An input / output interface 620 is also connected to the bus 614. An input unit 621, an output unit 622, a storage unit 623, a communication unit 624, and a drive 625 are connected to the input / output interface 620.

The input unit 621 has an arbitrary input device such as a keyboard, a mouse, a touch panel, an image sensor, a microphone, a switch, and an input terminal. The output unit 622 has an arbitrary output device such as a display, a speaker, and an output terminal. The storage unit 623 has an arbitrary storage medium such as a hard disk, a RAM disk, a non-volatile memory such as an SSD (Solid State Drive) or a USB (Universal Serial Bus) memory, and the like. The communication unit 624 is an arbitrary communication standard of wired or wireless, or both, such as Ethernet (registered trademark), Bluetooth (registered trademark), USB, HDMI (registered trademark) (High-Definition Multimedia Interface), IrDA, etc. Has a communication interface. The drive 625 drives a removable medium 631 having an arbitrary storage medium such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

In the computer configured as described above, the CPU 611 loads the program stored in the storage unit 623 into the RAM 613 via the input / output interface 620 and the bus 614 and executes the above-described series. Is processed. The RAM 613 also appropriately stores data and the like necessary for the CPU 611 to execute various processes.

The program executed by the computer (CPU611) can be recorded and applied to the removable media 631 as a package media or the like, for example. In that case, the program can be installed in the storage unit 623 via the input / output interface 620 by attaching the removable media 631 to the drive 625.

The program can also be provided via wired or wireless transmission media such as local area networks, the Internet, and digital satellite broadcasting. In that case, the program can be received by the communication unit 624 and installed in the storage unit 623.

In addition, this program can be pre-installed in the ROM 612 or the storage unit 623.

Similarly, the series of processes executed by the server 104 can be executed by hardware or by software. In that case, the CPU 301 loads the program stored in the ROM 302 or the storage unit 313 into the RAM 303 and executes the program, so that the above-mentioned series of processes is performed. The RAM 303 also appropriately stores data and the like necessary for the CPU 301 to execute various processes. The program executed by the server (CPU301) can be installed in the storage unit 313 via the input / output interface 310 by mounting the removable media 321 as a package media or the like on the drive 315, for example. The program can also be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting, which can be received by the communication unit 314 and installed in the storage unit 623. In addition, this program can be pre-installed in the ROM 302 or the storage unit 313.

The program executed by the computer may be a program that is processed in chronological order in the order described in this specification, or may be a program that is processed in parallel or at a necessary timing such as when a call is made. It may be a program in which processing is performed.

Further, in the present specification, the steps for describing a program recorded on a recording medium are not only processed in chronological order in the order of description, but also in parallel or not necessarily in chronological order. It also includes processes that are executed individually.

It should be noted that the series of processes described above may be partially executed by hardware and others executed by software.

Further, the processing of each step described above can be executed in each device described above or in any device other than each device described above. In that case, the device that executes the process may have the above-mentioned functions (functional blocks, etc.) necessary for executing the process. In addition, the information required for processing may be appropriately transmitted to the device.

Further, in the present specification, the system means a set of a plurality of components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Therefore, a plurality of devices housed in separate housings and connected via a network, and a device in which a plurality of modules are housed in one housing are both systems. ..

Further, in the above, the configuration described as one device (or processing unit) may be divided and configured as a plurality of devices (or processing units). On the contrary, the configurations described above as a plurality of devices (or processing units) may be collectively configured as one device (or processing unit). Further, of course, a configuration other than the above may be added to the configuration of each device (or each processing unit). Further, if the configuration and operation of the entire system are substantially the same, a part of the configuration of one device (or processing unit) may be included in the configuration of another device (or other processing unit). ..

For example, the transmission band may be set in a device other than the high-sensitivity receiver 154 or the high-sensitivity transmitter / receiver 341. For example, this process may be performed in the mixer 144, in the server 104, or in another device. That is, the transmission band setting unit 263 may be included in any of the above-mentioned devices, or may be configured as an independent device.

Although the preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that anyone with ordinary knowledge in the technical field of the present disclosure may come up with various modifications or modifications within the scope of the technical ideas set forth in the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

For example, the present technology can have a cloud computing configuration in which one function is shared by a plurality of devices via a network and processed jointly.

Further, each step described in the above-mentioned flowchart can be executed by one device or can be shared and executed by a plurality of devices.

Further, when a plurality of processes are included in one step, the plurality of processes included in the one step can be executed by one device or shared by a plurality of devices.

Further, the present technology is not limited to this, and any configuration mounted on such a device or a device constituting the system, for example, a processor as a system LSI (Large Scale Integration) or the like, a module using a plurality of processors, or a plurality of modules. It can also be implemented as a unit using the above-mentioned module, a set in which other functions are added to the unit (that is, a part of the configuration of the device).

The present technology can also have the following configurations.
(1) Set a part or all of an unused frequency band in the transmittable frequency band of the transmission line to be used for transmitting a predetermined signal. An information processing device equipped with a setting unit.
(2) The transmission line is a coaxial cable that transmits a received broadcast signal.
The setting unit is a frequency band used for transmission of the predetermined signal when a part or all of the free band is mixed with the broadcast signal and transmitted using the coaxial cable. The information processing apparatus according to (1), which is configured to be set as a certain transmission band.
(3) The setting unit detects the free band by detecting a signal transmitted in the transmittable band, and sets a part or all of the detected free band as the transmission band (2). The information processing device described.
(4) The setting unit obtains the free band based on information on the frequency band of the broadcast signal corresponding to the position of the information processing device, and sets a part or all of the obtained free band as the transmission band. The information processing device according to (2).
(5) Further provided with an acquisition unit for acquiring information on the frequency band of the broadcast signal from another device.
The information processing apparatus according to (4), wherein the setting unit is configured to set the transmission band using information on the frequency band of the broadcast signal acquired by the acquisition unit.
(6) Further provided with a position calculation unit that receives a GNSS (Global Navigation Satellite System) signal and obtains the position information.
The information processing according to (4), wherein the setting unit is configured to set the transmission band using information on the frequency band of the broadcast signal corresponding to the position information obtained by the position calculation unit. apparatus.
(7) The setting unit supplies the position information obtained by the position calculation unit to another information processing device, and relates to a frequency band of the broadcast signal corresponding to the position information from the other information processing device. The information processing apparatus according to (6), wherein the information processing device acquires information and sets the transmission band using the acquired information on the frequency band of the broadcast signal.
(8) Control of frequency-converting the predetermined signal into the transmission band and supplying the information indicating the transmission band set by the setting unit to the signal processing unit which is mixed with the broadcast signal and transmitted to the coaxial cable. The information processing apparatus according to any one of (2) to (7), further comprising a unit.
(9) The information processing apparatus according to (8), wherein the control unit supplies information indicating the transmission band as a spectrum-spread control signal via the coaxial cable.
(10) The signal processing unit further includes a receiving unit that receives the predetermined signal transmitted from the signal processing unit in the transmission band set by the setting unit via the coaxial cable (8) or (9). The information processing device according to any one.
(11) Further provided with a transmitter for transmitting a predetermined signal to the coaxial cable.
The setting unit is configured to set two transmission bands using the free areas that are different from each other.
The control unit is configured to supply information indicating the two transmission bands set by the setting unit to the signal processing unit.
The receiving unit is configured to receive the predetermined signal transmitted from the signal processing unit in one of the transmission bands set by the setting unit.
The information processing according to (10), wherein the transmission unit is configured to frequency-convert the predetermined signal into the other transmission band set by the setting unit and transmit the signal via the coaxial cable. apparatus.
(12) The information processing apparatus according to (1) to (11), further comprising a gain setting unit for setting a gain amount of a signal level of the predetermined signal.
(13) The information processing apparatus uses a part or all of an unused frequency band in the transmittable frequency band of the transmission line, which is a frequency band in which a signal can be transmitted, for transmitting a predetermined signal. Information processing method to be set to.
(14) Computer
As a setting unit that sets a part or all of an unused frequency band in the transmittable band of the transmission line to be used for transmitting a predetermined signal. A program to make it work.
(15) A control signal including information indicating a transmission band, which is a frequency band used for transmitting a predetermined signal, is acquired, and based on the acquired information indicating the transmission band, the predetermined signal has a frequency in the transmission band. An information processing device equipped with a control unit that converts and transmits to the transmission line.
(16) The transmission line is a coaxial cable that transmits a received broadcast signal.
The control unit acquires the control signal supplied via the coaxial cable, frequency-converts the predetermined signal into the transmission band based on the acquired information indicating the transmission band, and uses the broadcast signal. The information processing apparatus according to (15), which is configured to be mixed and transmitted to the coaxial cable.
(17) Further provided with a spectral back-spreading unit that spectrally back-spreads the spectrum-spreading control signal supplied via the coaxial cable.
The information processing apparatus according to (16), wherein the control unit is configured to acquire the control signal whose spectrum is back-spread by the spectrum back-diffusion unit.
(18) The control unit is configured to acquire a control signal including information regarding the setting of the gain amount.
The information processing apparatus according to any one of (15) to (17), further comprising an amplification unit that amplifies the predetermined signal with a gain amount specified by the information regarding the setting of the gain amount acquired by the control unit.
(19) The information processing apparatus acquires a control signal including information indicating a transmission band which is a frequency band used for transmitting a predetermined signal, and based on the acquired information indicating the transmission band, the predetermined signal is transmitted. An information processing method that converts a frequency into the transmission band and transmits it to a transmission line.
(20) Computer
A control signal including information indicating a transmission band, which is a frequency band used for transmitting a predetermined signal, is acquired, and the predetermined signal is frequency-converted to the transmission band based on the acquired information indicating the transmission band. A program for functioning as a control unit that transmits to a transmission line.

100 location notification system, 101 transmitter, 102 relay station, 104 server, 130 building, 131 rooftop equipment, 141 terrestrial antenna, 142 satellite antenna, 143 antenna, 144 mixer, 145 antenna cable, 151 distributor, 152 power supply , 153 TV receiver, 154 high-sensitivity receiver, 171 transmission information generator, 194 SAW filter, 195 LNA, 196 multiplication unit, 197 mixing unit, 198 capacitor, 199 distribution unit, 211 CPU, 212 oscillation unit, 231 signal processing Unit, 232 Information processing unit, 261 control unit, 262 memory, 263 transmission band setting unit, 264 control signal processing unit, 265 demodulation unit, 266 communication unit, 281 GNSS antenna, 291 GNSS signal processing unit, 331 amplification unit, 332 gain Setting unit, 341 high-sensitivity transmitter / receiver, 342 high-sensitivity transmitter / receiver, 351 switching unit, 352 signal transmitter, 353 PLL, 354 oscillator, 355 amplification unit, 361 transmission information generator, 371 ADC, 372 spectrum reverse diffusion processing unit , 381 spectrum spreading part, 382 oscillating part, 383 multiplying part, 384 amplification part, 392 channel information acquisition part, 410 anti-theft system, 600 computer

Claims (14)

A part or all of the free band, which is a frequency band not used for transmission of the broadcast signal, in the transmittable band, which is the frequency band in which the signal can be transmitted, of the coaxial cable for transmitting the received broadcast signal . A transmission band setting unit that sets a transmission band, which is a frequency band used for transmitting a predetermined signal, and a transmission band setting unit .
A gain setting unit that sets the gain amount of the signal level of the predetermined signal so as to reduce the difference in signal level between the predetermined signal and the broadcast signal.
It controls a signal processing unit that transmits a mixed signal of the predetermined signal and the broadcast signal via the coaxial cable, and converts the frequency band of the predetermined signal into the transmission band set by the transmission band setting unit. An information processing device including a control unit for amplifying the signal level of the predetermined signal with the gain amount set by the gain setting unit . The broadcast signal includes a broadcast signal of terrestrial broadcasting and a broadcasting signal of satellite broadcasting.
The information processing device according to claim 1 , wherein the gain setting unit sets the gain amount so as to reduce the difference in signal level between the predetermined signal and the broadcast signal of the terrestrial broadcasting . Further provided is a receiving unit that receives the mixed signal transmitted via the coaxial cable.
The information processing device according to claim 1 or 2. The gain setting unit measures the signal level of the broadcast signal and the predetermined signal included in the mixed signal received by the receiving unit, and sets the gain amount based on the measurement result.
The information processing device according to claim 3 . The transmission band setting unit identifies the free band by detecting the broadcast signal included in the mixed signal received by the receiving unit, and uses a part or all of the specified free band as the transmission band. Set
The information processing device according to claim 3 or 4. Further provided with an acquisition unit for acquiring information on the frequency band of the broadcast signal from another device.
The transmission band setting unit identifies the free band based on the information about the frequency band of the broadcast signal acquired by the acquisition unit, and sets a part or all of the specified free band as the transmission band.
The information processing apparatus according to any one of claims 1 to 4. Further provided with a position specifying unit for specifying the position of the information processing device based on a GNSS (Global Navigation Satellite System) signal.
The acquisition unit acquires information on the frequency band of the broadcast signal corresponding to the position specified by the position identification unit.
The transmission band setting unit identifies the free band based on the information about the frequency band of the broadcast signal corresponding to the position acquired by the acquisition unit , and a part or all of the specified free band is described. The information processing apparatus according to claim 6, which is set as a transmission band. The control unit transmits a control signal including information indicating the transmission band set by the transmission band setting unit and information indicating the gain amount set by the gain setting unit via the coaxial cable. Send to the signal processor
The information processing apparatus according to any one of claims 1 to 7. The information processing device according to claim 8, wherein the control unit transmits the control signal as a signal having a predetermined frequency . The information processing device according to claim 8 , wherein the control unit transmits the control signal by spreading the spectrum . The transmission signal, Ru further comprising a transmission unit to be transmitted through the coaxial cable
The information processing apparatus according to any one of claims 1 to 10. The transmission band setting unit further sets a frequency band used for transmission of the transmission signal.
The transmission unit transmits the transmission signal using the frequency band set by the transmission band setting unit.
The information processing device according to claim 11 . Information processing device
A part or all of the free band, which is the frequency band not used for the transmission of the broadcast signal, in the transmittable band, which is the frequency band in which the signal can be transmitted, of the coaxial cable for transmitting the received broadcast signal . Set as the transmission band, which is the frequency band used for transmitting a predetermined signal ,
The gain amount of the signal level of the predetermined signal is set so as to reduce the difference in signal level between the predetermined signal and the broadcast signal.
The signal processing unit that transmits a mixed signal of the predetermined signal and the broadcast signal is controlled via the coaxial cable, the frequency band of the predetermined signal is converted into the set transmission band, and the predetermined signal is transmitted. An information processing method for amplifying the signal level of the above with the set gain amount . Computer,
A part or all of the free band, which is a frequency band not used for transmission of the broadcast signal, in the transmittable band, which is the frequency band in which the signal can be transmitted, of the coaxial cable for transmitting the received broadcast signal . A transmission band setting unit that sets a transmission band, which is a frequency band used for transmitting a predetermined signal, and a transmission band setting unit .
A gain setting unit that sets the gain amount of the signal level of the predetermined signal so as to reduce the difference in signal level between the predetermined signal and the broadcast signal.
A signal processing unit that transmits a mixed signal of the predetermined signal and the broadcast signal is controlled via the coaxial cable, and the frequency band of the predetermined signal is converted into the transmission band set by the transmission band setting unit. A program for causing the signal to function as a control unit for amplifying the signal level of the predetermined signal with the gain amount set by the gain setting unit .

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