JPS63136829A - Radio data system receiver - Google Patents

Abstract

PURPOSE:To very easily select a desirable program by storing the broadcasting stations classified by the main types of programs sorted with a PTY code in plural memory blocks and displaying the program types which can be received after completing a preset in a batch. CONSTITUTION:When a sweep command is issued to a system controller 9 by operating a key matrix 15, the broadcasting station which can be received is received by means of a searching function. At this time a memory control circuit 17 stores the frequency information and the PS code of the receiving station in one of the specified memory blocks of the memory blocks 10a-10n previously classified by the main program types according to the data(numerical value information) obtained by a PTY code decoder 8b of an RDS decoder 8. The system controller 9 displays the program type information stored in a buffer memory 16 on a display 14 through a character generator 12 and an LCD driver 13 in a batch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a radio receiving basin that receives broadcast waves on which data signals are superimposed.

[Background of the invention] Conventionally, in West Germany and other countries, a system in which data signals were superimposed for identifying traffic information stations (Autofahrer Rundfun) was developed.
k Information: Abbreviation ARI> has been proposed.

This ARE is 19K, which is the pilot tone of FM broadcasting.
The third harmonic of Hz, 57Kl- (Z, has a subcarrier as an identification signal, and this is frequency-converted to the main carrier and broadcast. This identification signal is called the SK signal, and is By demodulating this SK signal, it was easy to receive broadcasting stations supplying traffic information.

However, the ARI system only provides identification for traffic information stations and does not provide any further services.

Therefore, a data signal encoded with a pie-phase code with a phase 90 degrees different from that of the API is transmitted to the same 57KHz subcarrier as FSK (Frequency 5hift).
system (ltadi) that modulates and transmits
o DataSl/Ste1M: it8 RDS system) was proposed.

As seen in the baseband coding shown in FIG. 1, the data supplied in the RDS system is formed into one group of four blocks each consisting of 26 bits.

Each block consists of a 16-bit information word, a 10-bit check word, and an offset word, and the receiving side can receive various services by demodulating the information word.

Basic information will be explained based on the data format shown in FIG.

The first block contains program identification information (PI code) 1
6 pits are given. This P1 code consists of ■Country code (4 bits) ■Broadcast range code (4 bits) ■Program reference number code (8 bits) for a total of 16
It is composed of bits, and information such as which country the broadcast is from, whether the same broadcast is being broadcast in other countries, whether it is a local program or a major program, etc. is stored as data based on predetermined rules. Sent.

The second block contains the group type code (4 bits),
A group type identification code is given using a total of 5 bits including a version code (1 p!-). This group type identification code is used to identify what is being sent in the data that is sent after that.Theoretically, it is possible to identify 25 = 32 group types, but currently it is Two versions, versions A and B, are defined for the four groups O to 3, and an undefined group is added to these, making a total of nine groups identifiable. The type of data sent thereafter differs depending on the group, but its explanation will be omitted here.

Following the group type identification code: ■Transportation program code (TP code, 1 bit) ■Program type code (PTY code, 5 bits) ■Transportation announcement code (TA code, 1 bit) ■Music/speech switch code (M/S code·
(1 pit) ■Decoder control bit (DI pit, 1 pit) ■Address bit (2 bits) are given.

In the above data, the TP code and TA code indicate whether the broadcasting station is a traffic information station or whether it is currently broadcasting by a coarse combination of the respective codes.

PTY codes identify 32 types of programs from 0 to 31 (music programs, news programs, sports programs, etc.) and are stored based on predetermined rules, and a list of them is shown in Table 1. .

(Left below) Table 1 No. PTY code Program type 1 000
00 No programs 2 00001 News 3 00010 Hours 4 00011 Manga 5 00100 Sports 6 00101 Education 7 00110 Programs for children 8 0011
1 Program for young people 9 01000 Religious program 10 01001 Drama 11 01010 Rock music 12
01011 Light music 13 01100 Serious music 14
01101 Jazz 15 01110 Folk music 16
01111 Variety 17-30
Undefined 31 11111 If the emergency broadcast M/S code is i 0 n, speech is being broadcast, and if it is "1", music is being broadcast.

The DI pit provides decoding information to demodulate the incoming broadcast waves, and 1 bit is given, but by repeating this 4 times and receiving it, 4 pits of information (16 types of decoding information) can be obtained. ).

The function of the address bit differs depending on the group type described above, but in this embodiment, it indicates the address of the PS code, which will be described later, and will be explained in detail in the explanation of the PS code.

Two 8-bit pieces of other station frequency information (AF code) are given to the third block.

This AF code transmits frequency information of the station currently broadcasting and other stations broadcasting the same program. This frequency information is 100KH
Each z corresponds to 8 bits of data.

Number AF code Carrier frequency 0
00000000 87.5M, Hzl
00000001 87.6MH2204
11001100107, 98) lz The 8-bit codes corresponding to numbers above this are given other meanings, and transmit information such as how many AF stations are present. This AF code is repeatedly transmitted up to 25 stations and becomes the other station information list.

The fourth block is given a program service code (PS code) in which the name of the broadcasting station is sent in ASCII code. Since the ASCII code requires 8 bits of binary code for each character, only two characters can be transmitted in the fourth alloc. In RDS, the broadcasting station name is given using 8 characters, so the 8 characters worth of ASCII data is not available until the data is received 4 times.

At this time, it is the address bits of the second block mentioned above that determine which character of the eight characters corresponds to the PS code currently being sent, and shows the following correspondence.

Address bit Character array 00 1.2nd character 01 3.4th character 10 5.6th character 11 7.8th character In this way, the information of the PS code currently being sent by the address bits is the character of the station name. By repeating demodulation four times on the receiving/demodulating side, the
It becomes possible to demodulate broadcast station names consisting of characters.

[Prior art 1] Using the above-mentioned RDS system, listeners can know what kind of program the radio broadcast they are currently listening to is based on the PTY code, and can also display the name of the broadcasting station on a display etc. using the PS code. It becomes possible to display it.

FIG. 6 shows an embodiment using a conventional RDS tuner.

In the figure, from antenna 1 to front end 2 and F
The signal passed through the M detection circuit 3 is amplified by the amplifier 4 and output as audio from the speaker 5, and the output of the amplifier 4 is P
The aforementioned RDS data input to the ROS decoder 8 including the S code decoder 8 a and the PTY data decoder 8 b and demodulated by the RDS decoder 8 is provided to the system controller 9 . The system controller 9 identifies the presence or absence of a receiving station using the main power of the S meter detection circuit 7 which detects the S meter output obtained by direct current detection of the intermediate frequency output of the receiving station from the front end 2, and also uses the PLL 6 to detect the presence or absence of the receiving station.
Data is given to perform a well-known channel selection operation, or the reception band is sequentially swept by a dilution command signal from the input section 11.

10 is a memory for recording and polishing frequency information of the receiving station;
Frequency information is retrieved from a predetermined memory by operating the input unit 11, and the system controller 9 provides channel selection information to the PLL 6. At this time, the frequency information, broadcast station name using PS code, program content using PTY code, etc. are converted into character information using the PTY data table 9a that stores character information corresponding to the PTY code, the ASCII code conversion tool 9b, etc. After conversion, a display 1 consisting of a dot matrix display tube or the like is displayed via a character generator 12 and a liquid crystal driver 13.
4.

When the RDS receiver shown in FIG. 6 sequentially scans within the band and the S meter detection circuit 7 detects the presence of a broadcasting station, the RDS decoder 8 extracts a PTY code from the second block of RDS codes.

By demodulating the PS codes from the fourth block, the system controller displays the information on display 1.
4, and the frequency information and PS code are stored and held in the memory 10.

By calling up a broadcast station preset in the memory 10 from the input unit 11, the broadcast station is received and audio is output, and the program type and the name of the broadcast station are displayed on the display 14, providing a service to the listeners. .

[Problem to be Solved by the Invention 3] Conventional RDS receivers only learn the program content and station name being broadcast by a preset broadcasting station by calling up the preset broadcasting station as described above. If you want to catch up on the news or are there sports broadcasts somewhere, you can call up all preset channels or check the content of the broadcast stations you catch while using a sweep command. However, in the case of a vehicle-mounted receiver, since the receiver is moved, the desired program type may not be available for reception. At this time, no matter how many preset channels you call up or search, you will not be able to receive the program, so these operations will not only be a wasted effort, but also cause you to become distracted while driving. It has become a kind of social problem that is dangerous.

[Means for Solving the Problems] An object of the present invention is to provide a receiver that overcomes the problems of the prior art described above, and which sequentially sweeps within the reception band using a sweep command. The obtained broadcasting stations are classified by P-Y code and stored in different groups of memories, and if at least one broadcasting station is stored in that group memory, it is assigned to that memory block. By displaying program type names all at once on the display, the user can determine the program types that are currently available for listening.

[Embodiment of the Invention] Fig. 2 shows an embodiment of this light. Note that the same parts as those in the prior art are given the same reference numerals, and the explanation thereof will be omitted.

In this invention, the memory 10 has a plurality of memory blocks an, each of which is provided with a predetermined number of memory tables.

The key matrix 15 has the same configuration as the conventional input section 11, such as a preset channel selection key and a sweep command key, as well as a main program type input section 15a according to the PTY code classification, as shown in FIG. The number of keys on the main program type input section 15a is the same as the number of memory blocks.

System controller 9 by operating key matrix 15
When a sweep command is given to the station, receivable broadcast stations are received using well-known search techniques.

At this time, the PTY code decoder 8 of the RDS decoder 8
According to the data (numerical information) obtained by b, the memory control circuit 17 stores the frequency information and PS code of the receiving station in one of the predetermined memory blocks 10a to 10n classified in advance by major program types. do.

For example, a news program given by the PTY code N0rIJ is stored in the memory 10a as P1-Y:l-DONO[4
The sports program given by `` is stored in memory ff1ll m1 so that the broadcasting station of a predetermined program type is preset in each memory block, such as in memory 1 (l).
A circuit 17 controls operations into and out of memory. As a result, broadcasting station information classified by PTY code is stored in the memory block after the search.

At the same time, the information obtained by the PTY decoder 8b is PT
Buffer 1 of character information input to Y data table 9a
Store in memory 16.

After completing the search and presetting, the system controller 9 displays the program type information stored in the buffer 1 memory 16 on the display 14 via the character generator 12 and LCD driver 13. FIG. 4 shows an example of the display.

This display example shows that there is no preset broadcast station in the fifth memory block.

The user who has confirmed which program type is currently receivable based on the display on the Wi
By operating the program type input section 15a of the system controller 9 and pressing the "Sports" key, for example, the system controller 9
informs the memory control circuit 17 that "sports" has been selected, and the memory control circuit 17 calls the memory block 10b that stores sports programs, and reads the frequency information and broadcasting station frequency information stored in the memory block 10b. The PS code is displayed on the display via an ASCII code conversion tool 9b or the like. FIG. 5 shows an example of the display at that time.

While looking at the broadcast station name and preset key number displayed on the display, the user further selects the key matrix 15.
By operating the pre-select channel switch, it becomes possible to select an appropriate broadcasting station at will.

Of course, when another program type key on the key matrix is operated, the broadcasting station name, frequency, and preset channel number stored in the corresponding memory block are displayed.

[Another Embodiment of the Invention] In the above embodiment, the broadcasting stations stored in each memory block are stored based on the search results, so they are arranged in order of frequency. This is detected by the S meter detection circuit 7. By sorting the broadcasting stations in descending order of S meter output, the broadcasting station with the strongest electric field strength is displayed at the top of the display 14, so that the user can use this as a criterion when selecting a channel. It's okay. This can be achieved by storing frequency information, PS code, and field strength information in memory and rearranging them in order of field strength. The method of sorting is to compare the electric field strength of the preset station at the first memory location stored in advance with the electric field strength of the received broadcasting station, and if it is larger, replace the received broadcasting station information at that memory location. hand,
The previously stored information is sequentially shifted, and if the field strength of the received broadcasting station is smaller than the field strength of the preset station at the first memory location, it is compared with the field strength of the next preset station. By doing so, the broadcasting stations within each mesori block will eventually be rearranged in order of electric field strength.

The means for sorting is not limited to the above-mentioned means, and any known sorting means can be used.

[Effects of the Invention] In this invention, as described above, broadcast stations classified by major program type are stored in a plurality of memory blocks, and the receivable program types can be displayed all at once after presetting is completed. Therefore, after checking the receivable program types, the user can first select the desired program type using the key matrix and display only the receiving stations that broadcast that program type on the display. It is miserable and effective to choose, and it becomes possible to receive service provision of unprecedented reception right.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the data format of broadcast data used in the RDS system, and FIG. 2 is a diagram showing the data format of broadcast data used in the RDS system.
FIG. 3 is a front view showing one embodiment of the key matrix used in the present invention, and FIGS.
The figure is a front view showing an example of what is displayed on the display, and FIG. 6 is a block diagram showing the configuration of a conventional RDS receiver.
8...RDS decoder 9...System controller 10a-Ion...Memory block 14...Display 15...Keyma 1-Rix 16...
Buffer door memory 17...Memory control circuit Applicant Pioneer Co., Ltd. Figure 2! Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A receiver for receiving a broadcasting system that superimposes a data signal other than the main signal component on an FM broadcast wave and sends it out together with the broadcast signal, the receiver comprising a decoder that demodulates the data signal, and a receiver based on the data content demodulated by the decoder. a control circuit that stores at least frequency information and broadcasting station name data information of a received broadcasting station in a memory block predetermined according to a classification, and the broadcasting station information is stored in at least one memory area in the memory block; A radio data system receiver comprising display means for collectively displaying the classification names given to the stored memory blocks.