DE3322987A1 - Receiver with automatic location finding - Google Patents

Abstract

In a broadcast receiver in which the data of all transmitters which can be received in a region are stored, an automatic location-finding operation is carried out. After all received frequencies have been determined, the frequencies are compared with an electronically stored first table and, in the case of receivability in several regions, with a second table. In the case of the received frequencies having the three greatest received field strengths, the region counter belonging to the location of a transmitter is incremented by a further amount if the frequency corresponds to the first table. <IMAGE>

Description

Recipients with an automatic location determination

The invention relates to a receiver with automatic location determination according to the preamble of claim 1.

From DE-OS 30 40 465.0 a receiver with automatic location determination known who gains location information by being in a reception area received transmitters are determined and from the determined combination of receivable Transmitter is closed to the location.

In an operating state of the receiver that is used for initialization, are initially all receivable in one frequency range, e.g. the VHF range Stations tuned one after the other.

The frequency values determined during the search at which stations receive are cached in a memory in the following called RAM. Subsequently, by evaluating the cached data and the Using the transmitter data for the entire area determines how many of the The frequency values determined by the search run in the individual sub-ranges as receivable are stored.

The setting of the receiving frequencies can be done, for example, in the following way as described in DE-OS 27 16 044.

In poor reception conditions or when using a directional antenna it can be with an automatic location determination, as suggested in DE-OS 30 40 465 it can happen that the determined reception frequencies are in the same number in several geographically distant areas, corresponding to those stored in a ROM Table, occur more than once. The location can then no longer be clearly determined will.

The invention is based on the object with a receiver automatic location determination to determine a unique location, if reception conditions are poor or if a directional antenna is used.

The object is achieved by the features specified in claim 1 solved.

After a new location determination has been triggered by the operator is, will all of the. Broadcasters used frequencies from 87.60 to 108.00 MHz one after the other checked whether they are received or not. During this During the search, a table with reception frequencies is created in a RAM. After this Search run, the received field strength is measured at each of the received frequencies and saved. The frequencies with the greatest determined field strengths are for the security of the automatic Positioning is important and are therefore specially marked.

The area in which the recipient is located results from the Receiving frequencies, the weighted frequencies with the greatest field strengths and 2 Transmitter tables, which are stored in a read-only memory, hereinafter called ROM are. Once the recipient's location is known, the two Transmitter tables in the ROM contain the names of the broadcasters with their program numbers The reception frequencies determined during the search are assigned in the RAM.

To determine the location of the recipient, a distinction is made between an area A in which the specified station can be received and an area B, in which he will definitely be received. Every receivable frequency is in the RAN own area counter assigned which at the beginning of a location determination the value Have "0". The counters are incremented differently during the determination of the position. After the determination, the meter with the highest meter reading becomes the location area derived from the recipient.

From the station table determined during the search, the two in the ROM stored Tables 1 and 2 and the by the field strength measurement based on the The receiving frequencies weighted with the greatest field strengths result in the receiving area of the receiver in the following way: 1. Each frequency received during the search is compared with the frequencies contained in Table 1. If there is agreement the area counter in the RAM is increased by the value "one", which is indicated by the area A in Table 1 and, if applicable, Table 2 are identified.

2. At the frequencies received, those with the greatest field strength will count if the frequencies match with table 1 of the the area counter specified for area B is increased. The amount by which the area counter is increased is equal to the number of frequency matches that a transmitter has to be established.

With the procedures mentioned under points 1 and 2, it is possible to with the worst reception, e.g. if only the local station is received, the Clearly determine the reception area. Even when using a directional antenna there is no need to worry about false displays, because either is due to the directional characteristic the receiving location of the antenna appears to be relocated to a neighboring receiving area, so that the stations received from there are displayed, or it will, as below Point 2 described, the reception area due to the greater weighting of local channels determines where the recipient is really located.

The invention is described below using an exemplary embodiment described in more detail. The figures show: FIG. 1 a first transmitter table, FIG. 2 a second Station table.

The first transmitter table shown in FIG. 1 is in data blocks structured. Each block begins with a maximum of three bytes 11-13, the common data from transmitters.

In byte 11 from bit 0 to bit 6 is the number of the broadcasting company for the following stations are entered. A distinction can be made between up to 128 broadcasters will. The transmission frequencies 87.60 ... 108.00 MHz are with a grid of 50 kHz the numbers 1 to 409 have been assigned. If frequency information is given in a data block occur that are greater than 100.30 MHz (255), then bit 7 of byte 11 is set and a code word 12 follows. Bits 0 to 7 of byte 13 are Programs assigned from one to eight. Existing programs are given a logical "1" marked. Analogous to this, the programs in code word 12 have a logical one 12 marks9 whose frequency number is greater than 255. Within a data block 15-18 are given from byte 14 frequency numbers and area information of transmitters that all can be summarized under the first three bytes 11-13.

The number and order of the frequency numbers of each transmitter is determined by byte 13. According to the frequency numbers of each transmitter in the bytes 14-15 are followed by area information, which has been subdivided into areas A and B, and by bytes 16 and 17 for area A and byte 18 for area B. are.

In the area A, the frequency numbers given by the preceding specified transmitters, as they are identified in bytes 14-15, due to their reach can be received. Within area B, the transmitter is at least definitely received in one part because the transmitter is located there.

Bit 0 to bit 6 of byte 16 contains a first area number, from which further can be derived with Table 2 of the second table. the FRG with neighboring countries can be divided into 68 areas, for example. If several Areas are provided, bit 7 of byte 16 is equal to 1 and an address word follows 17 for table 2. In byte 18, bits 0 to 6 are also used for specifying the area. Bit 7 of byte 18 signals the end of the data block with the value logical "1".

In Fig. 2 the structure of a second transmitter table is shown. The address word 17 in Fig. 1 contains a constant with which a group 20-22 of Area markers can be found. Each group 20-22 contains a different one Number of bytes that belong together, starting with 1 numbered consecutively are.

For example, if in Fig. 1 the address word 17 from the constant C2 for group 21 added with a "one", so C2 + 1, then in Fig. 2 is the group Go to C2. Two bytes that belong together are processed in each case.

Because of the 1 added to C2, the first two bytes are the Skipped group. For example, if byte 16 is also area number 4 in Fig. 1 contains, then in Fig. 2 the bit 7 of the 3rd byte symbolizes the area 5 and the of the 4th byte is area 13. All other bits have the same meaning. Areas in which the station could be received are marked with a 1.

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Claims (1)

Claim 1. Receiver with automatic location determination for determining transmitters that can be received in a reception area (VHF), characterized in that that all frequencies received during a search with one in a first electronic Memory stored first table (Fig. 1) are compared that if there are matches of the receivable frequencies with those stored in the first table (Fig. 1) Frequencies (14, 15) one for the received frequency in a second electronic Memory provided area counter is increased by a predetermined amount that if there are several reception areas for a received frequency die-in a second table stored in a third electronic memory (Fig. 2) marked area counter can be increased by a predetermined amount and that at the received frequencies that correspond to those with the greatest reception field strength count and that are received by only one transmitter, if the frequencies match with the first table of the area counter associated with the location of a broadcaster is increased by a second amount.