TWI548279B - Multimedia transceiver system, multimedia transmission apparatus, and multimedia receiving apparatus - Google Patents

Description

Multimedia transmission receiving system, multimedia transmission device and multimedia receiving device

The invention relates to a signal transmission technology, in particular to a multimedia transmission receiving system, a multimedia transmission device and a multimedia receiving device.

In the current life, usually one family has at least two display devices, and each display device is coupled to a multimedia signal source. It is worth noting that the multimedia signal source transmits multimedia data to each display device through a conventional image transmitting device, and the conventional image transmitting device transmits multimedia data through a coaxial cable. However, coaxial cable is expensive and its price is proportional to the cable length. Once the length of the coaxial cable is as long as 500 meters, the cost is considerable. In actual situations, the weight of the coaxial cable is heavier, which often leads to the inconvenience of the worker to carry out the cable construction.

In order to solve the cost problem, the manufacturer tried to improve the wired transmission (coaxial cable) to wireless transmission, wherein the wireless transmission includes radio frequency transmission. However, in general, each display device is disposed in a different space, and the spaces are separated by a cement wall or other shield. In actual situations, when performing RF transmission, the RF signal is easily blocked by the cement wall, so that the RF signal received by the display device is poor.

In view of the above prior art problems, the present invention proposes an effective reduction in the amount of expensive coaxial wire used to reduce wire cost or avoid wireless A multimedia transmission receiving system, a multimedia transmission device, and a multimedia receiving device that are shielded by obstacles and further extend the signal transmission distance.

In one aspect, the present invention provides a multimedia transmission and reception system capable of transmitting low frequency control data through one of the twisted pairs of cables to achieve the effect of controlling the remote receiving apparatus.

In another aspect, the present invention further provides a multimedia transmission and reception system capable of transmitting power to a remote receiving device through one of the cables to reduce the volume of the receiving device and the effect of not additionally increasing the power supplied by the transformer.

One aspect of the present invention provides a multimedia transmission and reception system including a multimedia transmission device and a multimedia reception device. In one embodiment, the multimedia transmission device converts the processed multimedia signal to at least one differential signal suitable for transmission by at least one first pair of signal lines coupled to an output interface of the outer end of the multimedia transmission device. In addition, the multimedia receiving device is coupled to the multimedia transmitting device to receive the at least one differential signal via the first pair of signal transmission lines, and the multimedia receiving device converts and processes the at least one differential signal into a radio frequency multimedia signal.

Another aspect of the present invention provides a multimedia transmission device including a multimedia input interface, an output interface, and a multimedia modulation module. In one embodiment, the multimedia input interface receives the multimedia signal, and the output interface is adapted to couple the cable having the plurality of pairs of signal lines. It is noted that the multimedia modulation module is coupled to the multimedia input interface and converts the multimedia signal to at least one differential signal and to the at least one first pair of signal lines of the plurality of pairs of signal lines.

Another aspect of the present invention provides a multimedia receiving device including an input interface and a multimedia mixing module. In one embodiment, the input interface is adapted to couple a cable having a plurality of pairs of signal lines, wherein at least one of the first pair of signal lines is loaded with at least one differential signal. In addition, the multimedia mixing module is coupled to the cable and receives at least one differential signal, and carries at least one differential signal to the RF signal to form a radio frequency multimedia signal.

Compared with the prior art, the multimedia transmission receiving system, the multimedia transmission device and the multimedia receiving device according to the present invention are modulated by multimedia The module converts the multimedia signal to at least one differential signal, thereby transmitting the intermediate frequency signal to the display device. In an actual case, at least one pair of differential signals may be by a cable having a plurality of pairs of twisted pairs, such as a Category 5 transmission line (CAT-5 Cable) or a Category 6 transmission line (CAT-6) or an equivalent effect cable thereof. For transmission, the Category 5 twisted pair is a low-cost, lightweight, and construction-friendly material that can significantly reduce costs without compromising signal quality. In other words, the multimedia transmission receiving system of the present invention can effectively solve the problem of long-distance transmission and high cost, and can directly apply the current display device to display multimedia pictures.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

[this invention]

1, 1A‧‧‧Multimedia transmission and reception system

10, 10A, 10B‧‧‧ multimedia transmission device

20‧‧‧ cable

30, 30A, 30B‧‧‧ multimedia receiving device

80‧‧‧Multimedia source

90‧‧‧ display device

100‧‧‧Multimedia input interface

110‧‧‧Signal Enhancement Module

120‧‧‧Power Conversion Module

130‧‧‧Transmission Control Module

140, 140A‧‧‧Multimedia Modulation Module

141‧‧‧Decoding unit

142‧‧‧Compression unit

143‧‧‧Modulation unit

150‧‧‧Output interface

210‧‧‧ first pair of signal lines

220‧‧‧ second pair of signal lines

230‧‧‧ third pair of signal lines

310‧‧‧Signal Compensation Module

320‧‧‧voltage regulator

330‧‧‧ Receive Control Module

340‧‧‧Multimedia Mixing Module

350‧‧‧Input interface

900‧‧‧Decoding module

S1‧‧‧Multimedia signal

S2‧‧‧Differential signal

S3‧‧‧RF multimedia signal

1 is a schematic diagram of an embodiment of a multimedia transmission device of the present invention.

2 is a schematic diagram of an embodiment of a multimedia receiving device of the present invention.

3 is a schematic diagram of an embodiment of a multimedia transmission and reception system of the present invention.

4 is a schematic diagram of another embodiment of a multimedia transmission and reception system of the present invention.

According to an embodiment of the present invention, a multimedia transmission device is provided. Specifically, the multimedia transmission device of the present invention can convert a multimedia signal into an intermediate frequency signal, and then transmit the transmission line formed by multiple pairs of twisted pairs to the playback end. Reaching the extended transmission IF signal reduces the use of expensive coaxial cables.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an embodiment of a multimedia transmission apparatus according to the present invention. As shown in FIG. 1 , the multimedia transmission device 10 includes a multimedia input interface 100 , an output interface 150 , and a multimedia modulation module 140 . In the actual situation, the multimedia input interface 100 receives the multimedia signal S1, wherein the multimedia signal S1 includes an image signal, a video signal or an audio signal, and the video signal The number contains image data and sound data, and there are no specific restrictions. In this embodiment, the multimedia signal S1 is preferably a high definition multimedia interface signal (HDMI Signal or Digital Visual Interface (DVI), etc., but is not limited thereto.

In addition, the output interface 150 is adapted to couple a cable having a plurality of pairs of signal lines, such as a transmission line such as CAT-5 or CAT-6. In this embodiment, the transmission line is a CAT-5 transmission line having four pairs of signal lines, each pair of signal lines being twisted-pair. It should be noted that the multimedia modulation module 140 is coupled to the multimedia input interface 10 and converts the multimedia signal S1 into at least one pair of differential signals S2 and is carried to the first pair of signal lines 210 of the plurality of pairs of signal lines. The at least one pair of differential signals may be a pair of intermediate frequency differential signals (IF±) or a pair of in phase differential signals (I±) and a pair of quadrature (quadrature) In the embodiment, the at least one pair of differential signals S2 is a pair of intermediate frequency differential signals (IF±), hereinafter referred to as intermediate frequency signals, for explanation.

The multimedia modulation module 140 is configured to convert the multimedia signal S1 to the physical layer of the corresponding multimedia signal format, and then convert the image into a differential signal S2 through image compression processing. The architecture of the multimedia modulation module 140 is a modulation module conforming to the DVB-T (Digital Video Broadcasting-Terrestrial) standard in the embodiment, and the internal structure and the multimedia signal are converted into The mode of the intermediate frequency signal (IF) or the I/Q signal is well known to those skilled in the art and will not be described herein. As shown in FIG. 1, the first pair of signal lines 210 are used to transmit a differential signal S2, wherein the differential signal S2 includes video and audio data, and the frequency range of the differential signal S2 is between 0 MHz and 30 MHz, but Not limited to this. In addition, it should be noted that if the at least one pair of differential signals is a combination of I±/Q±, transmission is performed through two pairs of twisted pairs.

According to another embodiment of the present invention, a multimedia receiving apparatus is provided; in particular, the multimedia receiving apparatus of the present invention can convert and process a differential signal transmitted from at least one pair of twisted wires, for example, an intermediate frequency differential The signal is either a combination of the in-phase differential signal (I±) and a pair of quadrature differential signals (Q±), and the differential signal is transmitted to the external or built-in set-top box via the wireless or wired method. (set-top box) display device. Please refer to FIG. 2. FIG. 2 is a schematic diagram of an embodiment of a multimedia receiving apparatus according to the present invention. As shown in FIG. 2, the multimedia receiving device 30 includes an input interface 350 and a multimedia mixing module 340. In this embodiment, the input interface 350 is adapted to couple a cable having a plurality of pairs of signal lines, such as a CAT-5 or CAT-6 cable, wherein the first pair of signal lines 210 are loaded with a differential signal. S2. For example, the multimedia receiving device 30 can be connected to the multimedia transmitting device 10 of FIG. 1 by using the first pair of signal lines 210, so that the differential signal S2 is transmitted from the multimedia transmitting device 10 to the multimedia receiving device 30. In other words, the present invention converts the multimedia signal S1 into the differential signal S2 by the multimedia transmitting device 10, and receives the processed differential signal S2 using the multimedia receiving device 30, and transmits the processed differential signal S2 to other devices.

As shown in FIG. 2, the multimedia mixing module 340 is coupled to the cable 210 and receives the differential signal S2, and carries the differential signal S2 to an RF signal (radio-frequency signal) to form a radio frequency multimedia signal. S3, and output the radio frequency multimedia signal S3 to the display device (not shown). It is worth noting that the current display device can have a built-in or external module capable of receiving and processing the RF multimedia signal S3, such as a set-top box, to restore the RF multimedia signal S3 to a compressed image signal, and then compress the image signal. Decompression processing is performed to obtain an audio/video signal, an audio signal, or an image signal, which is then provided to the display device for output. It should be noted that the radio frequency multimedia signal S3 outputted from the multimedia mixing module 340 can be transmitted to the built-in or external set-top box of the display device by wireless transmission, or can be transmitted through a wired transmission, for example, through a coaxial cable. Signal S3 connects the built-in or external set-top box of the display device.

According to the architecture of FIG. 1 and FIG. 2, it should be noted that, conventionally, the multimedia signal S1 usually includes a high-frequency image signal, and because the high-frequency signal is more easily attenuated during transmission, the high-frequency multimedia signal S1 ( Such as HDMI or DVI signals) often exceed the bandwidth of the Category 5 transmission line load transmission (about 100MH), or the bandwidth of the Category 6 transmission line (250MHz), therefore, if multimedia If the signal S1 is not processed, it is difficult to transmit over long distances through Category 5 or Category 6 transmission lines. However, the multimedia transmission device 10 of the present invention first converts the multimedia signal S1 into a differential signal S2 with a frequency less than or equal to 30 MHz by using the multimedia modulation module 140. This embodiment is an intermediate frequency signal, so that the differential signal S2 can be applied. It is transmitted on a Category 5 or Category 6 transmission line. Since the IF signal is not first carried on the transmitting device side to the RF signal, it is transmitted first with a low-cost Category 5 or Category 6 transmission line, and when it is close to the display device side, The intermediate frequency signal is converted into an RF signal through the receiving device, so that the intermediate frequency signal is transmitted through a long-distance coaxial cable, so that the use of a high-cost cable, such as a coaxial cable, can be reduced to reduce the cost of the wiring. It should be noted that the aforementioned 30 MHz is a frequency value of an embodiment, and is not limited by this value.

According to another embodiment of the present invention, a multimedia transmission and reception system is provided. Please refer to FIG. 3. FIG. 3 is a schematic diagram of an embodiment of a multimedia transmission and reception system according to the present invention. As shown in FIG. 3, the multimedia transmission receiving system 1 includes a multimedia transmission device 10A and a multimedia receiving device 30A. The multimedia transmission device 10A is further coupled to the multimedia input interface 100 and the signal transmission line and the multimedia signal source 80 connected thereto. The multimedia signal source 80 transmits a multimedia signal S1, such as an HDMI or DVI signal, to the multimedia transmission device 10A via the transmission line and the multimedia input interface 100. In an actual situation, the multimedia input interface 100 can be an HDMI interface or a DVI interface, and the multimedia signal source 80 can be a multimedia player, a multimedia interactive device with multimedia output or other multimedia signal output device, or can output audio and video information. Computers, etc., but there are no specific restrictions. The multimedia transmission device 10A is connected to the multimedia receiving device 30A via an output interface 150 and a cable 20, such as a CAT-5 or CAT-6 cable. In this embodiment, the output interface is an RJ45 interface, and the cable 20 is a CAT-5 cable.

As shown in FIG. 3, the multimedia transmission device 10A converts and processes the multimedia signal S1 into at least one pair of differential signals by using the multimedia modulation module 140, for example, an intermediate frequency differential signal (IF±) or an in-phase differential signal and a A combination of quadrature differential signals (I±/Q±). In this embodiment, the multimedia modulation module 140 For the DVB-T modulation module, the differential signal is an intermediate frequency differential signal, hereinafter referred to as a differential signal. The differential signal S2 output by the multimedia transmitting device 10A is carried to the first pair of twisted wires 210 in the cable 20. Similarly, if the multimedia transmission device 10A outputs two pairs of differential signals I±/Q±, the two pairs of differential signals I±/Q± are respectively carried on two pairs of twisted wires for transmission.

The multimedia receiving device 30A has a multimedia mixing module 340 for transmitting the received differential signal S2 to a radio frequency signal having a specific frequency band to form a radio frequency multimedia signal S3. The multimedia receiving device 30A is further coupled to the display device 90, and has a decoding module 900 for receiving the radio frequency multimedia signal S3 and decoding the radio frequency multimedia signal S3 to a video signal, an image signal or the image signal that the display device 90 can accept. Sound signal. In this embodiment, the decoding module 900 is connected to the multimedia receiving device 30A by a coaxial cable. In another embodiment, the decoding module 900 can also receive the radio frequency multimedia signal S3 output by the multimedia receiving device 30A in a wireless manner. In addition, although the decoding module 900 in this embodiment is built in the display device 90, in another embodiment, the decoding module 900 can also be designed as an external interface, and received by multimedia through a wired or wireless manner. The devices 30A are connected. In addition, it should be noted that if the external decoding module 900 is used, the restored information can be transmitted to the display device 90 through a wired connection.

Please refer to FIG. 4. FIG. 4 is a schematic diagram of another embodiment of a multimedia transmission and reception system according to the present invention. As shown in FIG. 4, the multimedia transmission receiving system 1A includes a multimedia transmission device 10B and a multimedia receiving device 30B. In addition, the multimedia transmission device 10B has an output interface 150 coupled to the multimedia receiving device 30B by a cable 20, wherein the cable 20 includes a plurality of pairs of signal lines. In the embodiment, the cable 20 is a CAT. The -5 cable has four pairs of signal lines, each pair of signal lines being twisted pairs.

The multimedia transmission device 10B of the present embodiment further includes a multimedia modulation module 140A, a signal enhancement module 110, a power conversion module 120, and a transmission control module 130, with respect to the multimedia transmission device 10A of FIG. Further, with respect to the multimedia receiving device 30A of FIG. 3, the multimedia receiving device 30B includes The signal compensation module 310, the voltage stabilization module 320, the reception control module 330, and the multimedia mixing module 340.

As shown in FIG. 4, the multimedia modulation module 140A includes a decoding unit 141, a compression unit 142, and a modulation unit 143. The decoding unit 141 is coupled to the multimedia input interface 100, and the compression unit 142 is coupled to the decoding unit 141. The compression unit 142 is coupled. In this embodiment, the decoding unit 141 receives the multimedia signal S1 from the multimedia input interface 100 and decodes the multimedia signal S1 to generate a decoded multimedia signal. In this embodiment, the multimedia signal S1 is an HDMI signal, and the decoding unit 141 has an HDMI physical layer. In addition, the decoding unit 141 transmits the decoded multimedia signal to the compression unit 142, and the compression unit 142 compresses the decoded multimedia signal into a compressed multimedia signal. In this embodiment, the compressed format is the MPEG-2 video and audio compression standard, but Not limited to this. The compression unit 142 transmits the compressed multimedia signal to the modulation unit 143, and the modulation unit 143 modulates the compressed multimedia signal into at least one pair of differential signals. In this embodiment, the pair of intermediate frequency differential signals, hereinafter referred to as the differential signal S2. In another embodiment, the at least one pair of differential signals may also be two pairs of differential signals I±/Q±. In other words, the multimedia modulation module 140A converts the format and frequency of the multimedia signal S1, and outputs the differential signal S2. In this embodiment, the differential signal S2 is transmitted using only a pair of signal lines (the first pair of signal lines 210). In other embodiments, if it is an I±/Q± signal, it can be transmitted through two pairs of signal lines, and is not limited to this example.

In addition, the signal enhancement module 110 is coupled to the multimedia modulation module 140 for increasing the signal strength of the differential signal S2 and carrying it to the first pair of signal lines 210 included in the cable. Specifically, the signal enhancement module 110 carries the enhanced differential signal S2 to the first pair of signal lines 210 via the output interface 150. The signal enhancement module 110 can increase the signal strength of the differential signal S2, and enhance the current driving force and improve the frequency response to avoid the phenomenon of signal attenuation after long-distance transmission, thereby extending the differential signal S2. Transmission distance.

As shown in FIG. 4, the signal compensation mode of the multimedia receiving device 30B Group 310 receives and compensates for the loss caused by the differential signal S2 over long distance transmissions. The differential signal S2 is prevented from being distorted, and the compensated differential signal S2 is transmitted to the multimedia mixing module 340. The multimedia mixing module 340 is coupled to the signal compensation module 310 for receiving the compensated differential signal S2 and carrying the differential signal S2 to the RF signal to form the RF multimedia signal S3. In this embodiment, the frequency range of the radio frequency multimedia signal S3 is between 100 MHz and 800 MHz, but not limited thereto.

As shown in FIG. 4, the power conversion module 120 and the transmission control module 130 are disposed in the multimedia transmission device 10B. In this embodiment, the power conversion module 120 is configured to convert the first voltage signal having the first voltage level into the second voltage signal having the second voltage level, and load the second voltage signal to the complex pair. The second pair of signal lines 220 in the signal line are output to the multimedia receiving device 30B to provide power for the multimedia receiving device 30B. By carrying power to the second pair of signal lines by the power conversion module 120, the remote multimedia receiving device 30B does not need to add an additional power providing device, such as a transformer plug, so that the volume of the multimedia receiving device 30B can be further reduced.

In a preferred embodiment, the first voltage level of the first voltage signal ranges from about 3 volts to about 7 volts, but is not limited thereto. In this embodiment, the first voltage level is 5 volts. In addition, the second voltage level of the second voltage signal ranges from about 10 volts to 14 volts, but is not limited thereto. In this embodiment, the second voltage level is 12 volts. The purpose of pulling up the second voltage signal is to prevent the voltage signal from attenuating after long-distance transmission.

It should be noted that although in this embodiment, the second pair of signal lines 220 are used to transmit the second voltage signal. However, in other embodiments, the power conversion module 120 can be coupled to another pair of ground signal lines to transmit a ground signal having a ground level to the multimedia receiving device, without particular limitation. In a practical situation, the power conversion module 120 is a level shifter that adjusts the level of the voltage signal and transmits the second voltage signal to the voltage regulator module 320 via the second pair of signal lines 220.

In addition, the voltage stabilization module 320 is disposed at the multimedia receiving device 30B. The second voltage signal is received by the voltage regulator module 320, and the third voltage signal is output according to the second voltage signal to supply the power of the multimedia receiving device 30B. The magnitude of the voltage level of the third voltage signal can be determined according to the actual power consumption of the multimedia receiving device 30B. It should be noted that the power conversion module 120 and the voltage regulator module 320 are not essential components of the present invention, and may be determined according to the power supply design manner of the multimedia receiving device 30B.

In some use cases, the remote multimedia receiving device 30B needs to be controlled. For example, the multimedia mixing module 340 in the multimedia receiving device 30B is controlled to carry the differential signal to the band of the set frequency signal, and the band corresponds to a specific channel. . Therefore, in order to meet such a demand, in this embodiment, as shown in FIG. 4, in an embodiment, the modulation unit 143 generates a control signal to the transmission control module 130 of the multimedia transmission device 10B, which is specific. The communication protocol transmits the control signal to the third pair of signal lines 230 of the plurality of signal lines for transmission to the multimedia receiving device 30B. The receiving control module 330 of the multimedia receiving device 30B is coupled to the third pair of signal lines 230 to receive the control signals, and controls the multimedia mixing module 340 according to the control signals. In other words, the present invention transmits the control signal by the transmission control module 130 to control the multimedia mixing module 340 of the multimedia receiving module 30B, thereby controlling the frequency modulation of the differential signal S2. In this embodiment, the communication protocol includes RS485 or an Inter-Integrated Circuit (I2C), but is not limited thereto. In this embodiment, the transmission control module 130 and the reception control module 330 can be an RS485 microcontroller (MCU, microcontroller), which has the advantages of small size, low price, and control signal transmission. In other words, the multimedia transmission receiving system 1A can transmit the differential signal S2, and the cost of the multimedia transmission device 10B and the multimedia receiving device 30B is not high, thereby achieving the effect of maintaining signal quality and reducing cost. It should be noted that the transmission control module 130 and the reception control module 330 are determined according to the use requirements, and are not essential elements of the present invention.

In an embodiment, the multimedia receiving device 30B can be configured as a connector, and is coupled to the display device 90 by a short length coaxial cable, but is not limited thereto. In other embodiments, the multimedia receiving device Instead of being coupled to the display device by a physical wire, the radio frequency multimedia signal S3 is transmitted through the antenna through the radio frequency transmission, and then the data is transmitted to the decoding module of the built-in or external display device 90. The decoding module is capable of demodulating and processing the radio frequency multimedia signal S3 into readable data, thereby allowing the display device 90 to output multimedia images, sounds or audio and video. In an embodiment, the display device 90 is applicable to the DVB-T standard, and thus has a module capable of processing the radio frequency multimedia signal S3, thereby outputting a multimedia picture.

Compared with the prior art, the multimedia transmission receiving system, the multimedia transmission device and the multimedia receiving device according to the present invention convert the multimedia signal into a differential signal by the multimedia modulation module, thereby transmitting the intermediate frequency signal to the display device. In one embodiment, the differential signal can be transmitted by a Category 5 twisted pair (CAT-5 Cable), and the Category 5 twisted pair is a low cost, light weight, and construction-friendly material that can significantly reduce costs. Does not reduce the quality of the signal. In other words, the multimedia transmission receiving system of the present invention can effectively solve the problem of long-distance transmission and high cost, and can directly apply the current display device to display multimedia pictures.

In addition, taking the DVB-T signal transmission as an example, since the multimedia receiving apparatus of the present invention, as shown in FIG. 2 to FIG. 4, the multimedia transmission receiving system of the present invention can not only extend the distance of the DVB-T signal, Moreover, the architecture of DVB-T demodulation does not require any change design, so that any display or output device under the DVB-T architecture can be used in combination with the multimedia transmission receiving system of the present invention, which increases the traditional DVB-T architecture. The display or output device expands the scalability of the DVB-T signal transmission distance solution. In addition, although the foregoing is exemplified by DVB-T, those skilled in the art can apply different signal transmissions according to the spirit of the present invention.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

1‧‧‧Multimedia transmission and reception system

10A‧‧‧Multimedia transmitter

20‧‧‧ cable

30A‧‧‧Multimedia Receiver

80‧‧‧Multimedia source

90‧‧‧ display device

100‧‧‧Multimedia input interface

140‧‧‧Multimedia Modulation Module

150‧‧‧Output interface

210‧‧‧ first pair of signal lines

340‧‧‧Multimedia Mixing Module

900‧‧‧Decoding module

S1‧‧‧Multimedia signal

S2‧‧‧Differential signal

S3‧‧‧RF multimedia signal

Claims (14)

A multimedia transmission and reception system includes: a multimedia transmission device that converts and processes a multimedia signal into at least one differential signal, and is adapted to be coupled to at least one first pair of signal lines coupled to an output interface of an outer end of the multimedia transmission device And a multimedia receiving device coupled to the multimedia transmitting device to receive the at least one differential signal via the at least one first pair of signal lines, wherein the multimedia receiving device converts and processes the at least one differential signal into a radio frequency multimedia signal The multimedia transmission device further includes: a multimedia input interface for receiving the multimedia signal; and a multimedia modulation module, comprising: a decoding unit coupled to the multimedia input interface and decoding the multimedia signal to generate a decoded multimedia a compression unit coupled to the decoding unit and compressing the decoded multimedia signal into a compressed multimedia signal; and a modulation unit coupled to the compression unit, wherein the modulation unit modulates the compressed multimedia signal to the at least one Differential signal. The multimedia transmission receiving system of claim 1, wherein the multimedia transmission device comprises: a signal enhancement module, configured to increase a signal strength of the at least one differential signal, and carry the signal strength to the at least one first pair of signal lines . The multimedia transmission receiving system of claim 1, wherein the multimedia receiving device comprises: The signal compensation module receives the at least one differential signal via the at least one first pair of signal lines to compensate the at least one differential signal. The multimedia transmission receiving system of claim 3, wherein the multimedia receiving device further comprises: a multimedia mixing module coupled to the signal compensation module for receiving the compensated at least one differential signal, and The at least one differential signal is carried on an RF signal to form the RF multimedia signal. The multimedia transmission receiving system of claim 1, further comprising: a power conversion module disposed in the multimedia transmission device for converting a first voltage signal having a first voltage level to have a first a second voltage signal of the second voltage level is output to a second pair of signal lines for transmission to the multimedia receiving device; and a voltage stabilizing module is disposed in the multimedia receiving device to receive the second voltage signal, The voltage regulator module outputs a third voltage signal according to the second voltage signal to supply power of the multimedia receiving device. The multimedia transmission receiving system of claim 1, wherein the multimedia receiving device is further coupled to a display device for receiving the radio frequency multimedia signal and decoding the radio frequency multimedia signal to the multimedia signal, wherein the display device is The multimedia receiving device is coupled by means of coaxial cable or wireless communication. The multimedia transmission receiving system according to claim 4, further comprising: a transmission control module is disposed in the multimedia transmission device, wherein the transmission control module transmits a control signal to a third pair of signal lines to the multimedia receiving device by using a communication protocol; and a receiving control module And the third pair of signal lines are coupled to receive the control signal, and the multimedia mixing module is controlled according to the control signal. A multimedia transmission device includes: a multimedia input interface for receiving a multimedia signal; an output interface adapted to couple a cable having a plurality of pairs of signal lines; and a multimedia modulation module coupled to the multimedia input interface Converting the multimedia signal to the at least one differential signal and carrying the at least one first pair of signal lines to the plurality of signal lines; wherein the multimedia modulation module further comprises: a decoding unit coupled to the multimedia input interface And decoding the multimedia signal to generate a decoded multimedia signal; a compression unit coupled to the decoding unit and compressing the decoded multimedia signal into a compressed multimedia signal; and a modulation unit coupled to the compression unit and the signal enhancement module Between the groups, wherein the modulation unit modulates the compressed multimedia signal to the at least one differential signal. The multimedia transmission device of claim 8, further comprising: a signal enhancement module coupled to the multimedia modulation module for increasing a signal strength of the at least one differential signal and outputting the signal strength through the output The enhanced at least one differential signal is carried to the at least one first pair of signal lines. The multimedia transmission device of claim 8, further comprising: a power conversion module disposed in the multimedia transmission device for converting a voltage signal having a first voltage level to have a second voltage level And a second voltage signal is applied to the second pair of signal lines of the plurality of signal lines. The multimedia transmission device of claim 8, further comprising: a transmission control module that carries a control signal to a third pair of signal lines of the plurality of pairs of signal lines by a communication protocol. A multimedia receiving device includes: an input interface, configured to couple a cable having a plurality of pairs of signal lines, wherein at least one of the first pair of signal lines is loaded with at least one differential signal; and a multimedia mixing module The at least one differential signal is coupled to the cable and the at least one differential signal is carried to an RF signal to form a radio frequency multimedia signal; wherein the third pair of signals in the plurality of signal lines The multimedia transmission device further includes: a receiving control module coupled to the third pair of signal lines to receive the control signal, and controlling the multimedia mixing module according to the control signal. The multimedia receiving device of claim 12, further comprising: The signal compensation module receives and compensates the at least one differential signal, and transmits the compensated at least one differential signal to the multimedia mixing module for conversion into the RF multimedia signal. The multimedia receiving device of claim 12, wherein the second pair of signal lines of the plurality of signal lines transmit a second voltage signal, and the multimedia receiving device further comprises: a voltage stabilizing module for receiving the And a second voltage signal, the voltage regulator module outputs a third voltage signal according to the second voltage signal to supply power of the multimedia receiving device.