JPS63136828A - Radio data system receiver - Google Patents

Abstract

PURPOSE:To very easily select a desirable program by storing broadcasting stations classified by main types of programs sorted by means of a PTY code in plural memory blocks. 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 with 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, which are previously classified by the main types of programs, according to the data(numerical value information) obtained by the PTY code decoder 8b of an RDS decoder 8. The system controller 9 displays the name of program type prescribed in the memory 10b on a display 14 and at the same time displays the names of the broadcasting stations by the frequency information and the PS code stored in the memory 10b on the display 14 through an ASCII code conversion tool 9b.

Description

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

[Background of the invention] Conventionally, in West Germany and other countries, a system was developed in which data signals were superimposed for identifying traffic information stations.
nk Information: Abbreviation ARC> has been devised.

This ARE is 19K, which is the pilot tone of FM broadcasting.
A subcarrier was attached to 57KHz, which is the third harmonic of H2, as an identification signal, and this was frequency-converted to the main carrier and broadcast. This identification <g is called an SK low signal, and the demodulation side demodulates this SK low signal to facilitate reception of broadcasting stations supplying traffic information.

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

Therefore, the bi-phase coded data signal with a phase 90 degrees different from the ARE phase is transmitted to the same 57 K HZ subcarrier as FSK (Frequency 5hi).
ft) modulated and transmitted system (Rad
io Data5ysten: Abbreviation RDS system)
was proposed.

The data provided in the RDS system consists of four blocks of 26 bits each, as shown in the baseband coding system shown in FIG.

One group is formed by tsuku.

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 PT 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 bit). This group type identification code is used to identify what is being sent in the data that is sent after that, and theoretically it is possible to identify 25-32 group types, but currently Two versions, version A and B, are defined for four groups from O to 3.
By adding undefined groups to this, nine groups can be identified. The type of data sent thereafter differs depending on the group, but its explanation will be omitted here.

Following the group type identification code: ■Traffic Ill 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 bit) ■Decoder control bit <DI bit, 1 bit) ■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 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, a list of which is shown in Table 1. .

(Leaving space below) Table 1 NO, PTY code Program type 1 00000 No program 2 00001 News 3 00010 Hour 4 00011 Manga 5 00100 Sports 6 00101 Education 7 00110 Program 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 Jisez 15 01110 Folk music 16
01111 Variety 17-30
Undetermined 31 11111 v4 Rapid Broadcast ~ If the I/S code is °0'°, speech is being broadcast, if 11111, music is being broadcast.

The DI bit gives decoding information to demodulate the incoming broadcast waves, and 1 bit is given, but by repeating this 4 times and receiving it, 4 bits of information (16 types) are given. decoding information) can be iq'd.

Although the performance of the address bit differs depending on the group type described above, in the first 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 37th lock.

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 87.5MHz1 0000
0001 87.6MH22041100110010
7, 9 Goods Z 8 Pitsu i that corresponds to the number above this
The code has another meaning, for example, it sends 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 block. In RDS, since the broadcasting station name is given using 8 characters, ASCII data for 8 characters is obtained only after receiving data 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. , 2nd character 01 3. 4th character 10 5. 6th character 11 7. 8th character In this way, the address bits specify which character of the station name the PS code information currently being sent corresponds to. Therefore, on the receiving/demodulating side, by repeating the demodulation wI four times, it becomes possible to demodulate a broadcasting station name consisting of 8 characters.

[Conventional Technique 24i1 Using the above-mentioned ROS system, listeners can know what kind of program content the radio broadcast they are currently listening to by using 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. 5 shows an example using a conventional RDS tuner.

6, from antenna 1 to front end 2 and F
The signal that has passed through the M detection circuit 3 is amplified by an amplifier 4 and output as audio from a speaker 5, and the output of the amplifier 4 is P
The aforementioned RDS data input to the RDS decoder 8 including the S food decoder 8 a and the PTY data decoder 8 b and subjected to 'f5 keying 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 based on the output 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.

PLL data is given to the PLL 6 to cause it to perform a well-known channel selection operation, or the receiving band is sequentially swept in response to a crushing command signal from the input section 11.

Reference numeral 10 denotes a memory for storing frequency information of receiving stations, and frequency information is read from a predetermined memory by operation of the input section 11, and the system controller 9 gives 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 14 consisting of a dot matrix display tube or the like is displayed via a character generator 12 and a liquid crystal driver 13.
to be displayed.

When the RDS receiver shown in FIG. 5 sequentially sweeps the band and the S meter detection circuit 7 detects the presence of a broadcasting station, the RDS decoder 8 detects the PTY code from the second block of the RDS code and the PS from the fourth block. By demodulating the codes, the system controller displays the information on the display 14 and stores the frequency information and PS code 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. .

[Problems to be Solved by the Invention] As mentioned above, the conventional RDS receiver is
, when you call up a broadcast station, you will only know the content of the program being broadcast by that station and the name of the station. In such a case, you will need to search for the desired broadcast station by calling up all preset channels or by checking the contents of the broadcast stations caught while issuing a sweep command, especially when using a car receiver while driving. This has become a social problem, as it is dangerous because people's attention is distracted.

[Means for Solving the Problems] It is an object of the present invention 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. It is characterized by classifying the obtained broadcast stations by PTY code and storing them in different group memories, and further displaying on the display the program type and broadcast station name that are classified and preset in the group memory. That is.

[Embodiment of the invention FIG. 2 shows an embodiment of the invention. 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 1ba according to the PTY code classification, as shown in FIG. The number of keys on this 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 a well-known search function.

At this time, the PTY code decoder 8 of the RDS decoder 8
According to the data (liters of 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 108 to 10n, which are classified in advance by major program types. Store. For example, a news program given by PTY code N0rIJ is stored in the memory 10a as PTY-1-code No r4.
The memory control circuit 17 is configured to preset broadcast stations of a predetermined program type in each memory block such that the given sports program is stored in the memory 10b.
controls the filling operation into memory. As a result, broadcasting station information classified by PTY code is stored in the memory block after the search.

If the user wants to listen to, for example, a "sports program" after the preset is finished, by operating the "sports" key of the key matrix 15, the key decoder 1
6 controls the memory control circuit 17 to select the memory contents of the memory 10b.

The system controller 9 causes the 1tlltl type name defined in the memory 10b to be displayed on the display 14, and also displays the frequency information and broadcasting station name in PS code stored in the memory 10b on the display 14 via the ASCII code conversion tool 9b. to be displayed. A display example is shown in FIG.

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 preset channel switch, it is possible to select an appropriate broadcasting station.

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 1 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, and 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. As for the means of sorting, compare the electric field strength of the preset station at the first memory location stored before $ 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. do,
The previously stored information is shifted sequentially, 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. As a result, the broadcast stations in each memory block are finally 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] As mentioned above, in this light, broadcast stations classified by main program type are stored in multiple memory blocks, so the user first selects the desired program type using the key matrix. Since it is possible to display only the receiving stations that broadcast that program type on the display, it is extremely effective in selecting the desired program, and it is possible to receive an unprecedented service provision. It becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a data format of broadcast data used in the RDS system, Fig. 2 is a block diagram showing the configuration of a receiver of the present invention, and Fig. 3 is an example of a key matrix used in the present invention. FIG. 4 is a front view showing an example of what is displayed on the display, FIG. 5 is a front view showing an example of the conventional RD.
FIG. 2 is a block diagram showing the configuration of S reception. 8...RDS decoder 9...System controller 108-10n...Memory block 14...Display 15...Keyma i-Rix 16...
Key decoder 17... Memory control circuit manager

Claims (1)

[Claims] A receiver for receiving a broadcasting system that superimposes a data signal other than a 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 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 by classification based on the classification; A radio data system receiver comprising display means for displaying a classification name given to a memory block and a broadcasting station name stored in the memory block.