JPH0511809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Technical Field] The present 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 (Autofahrer Rundfunk
Information (abbreviated as ARI) has been devised.

This ARI is the pilot tone of FM broadcasting.
A subcarrier was added to 57KHz, which is the third harmonic of 19KHz, as an identification signal, and this was frequency-converted to the main carrier for broadcasting. This identification signal
It was called the SK signal, and by demodulating this SK signal, the demodulator side made it easier to receive broadcasting stations that provided traffic information.

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

Therefore, we use FSK (Frequency Shift Keying) to transmit biphase coded data signals on the same 57KHz subcarrier with a phase that is 90° different from the ARI phase.
A system that modulates and transmits (Radio Data
System (abbreviated as RDS system) was proposed.

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

Each block contains 16-bit information words and 10
It consists of a 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 is given 16 bits of program identification information (PI code). This PI code consists of a total of 16 bits: a country code (4 bits), a broadcast range code (4 bits), and a program reference number code (8 bits), and it is used to determine which country the broadcast is from and whether the same broadcast is available in other countries. Information such as whether the program is being played, whether it is a local program or a major program, etc., is sent as data based on predetermined rules.

The second block is given a group type identification code consisting of a group type code (4 bits) and a version code (1 bit), a total of 5 bits. This group type identification code is used to identify what data is being sent after that, and theoretically it is possible to identify 2 ⁵ = 32 group types, but currently Two versions, versions A and B, are defined for the four groups 0 to 3, and an undefined group is added to these to make a total of nine groups identifiable. Although the types of data that are subsequently sent differ depending on the group, their explanation will be omitted here.

Following the group type identification code: Traffic program code (TP code, 1 bit) Program type code (PTY code, 5
Traffic announcement code (TA code, 1 bit) Music/speech switch code (M/S code, 1 bit) Decoder control bit (DI bit,
Address bits (1 bit) and address bits (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.

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

No. PTY code Program type 1 00000 No program 2 00001 News 3 00010 Current events 4 00011 Manga 5 00100 Sports 6 00101 Education 7 00110 Children's programs 8 00111 Youth programs 9 01000 Religious programs 10 01001 Drama 11 01010 Rotskuiyujitsuk 12 01011 Light music 13 01100 Serious music 14 01101 Jazz 15 01110 Folk music 16 01111 Variety 17-30 Undefined 31 11111 Emergency broadcast If the M/S code is “0”, it is speech, “1”
If so, it indicates that music is being broadcast.

The DI bit provides decoding information to demodulate the incoming broadcast waves.One bit is given, but by repeating this 4 times and receiving it, 4 bits 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.

The third block contains other station frequency information (AF code)
Two 8-bits are given.

This AF code transmits frequency information of other stations that are broadcasting the same program as the station that is currently broadcasting. This frequency information corresponds to 8-bit data every 100KHz.

Number AF code Carrier frequency 0 00000000 87.5MHz 1 00000001 87.6MHz ・ ・ ・ ・ ・ ・ 204 11001100 107.9MHz The 8-bit code corresponding to a number above this has a different meaning, for example, how many AF stations there are It sends information such as whether it exists. this
The AF code is repeatedly transmitted to 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. Although ASCII code requires 8 bits of binary code for each character, only 2 characters can be transmitted in the fourth block. In RDS, broadcast station names are given using 8 characters, so ASCII data for 8 characters is obtained only after receiving data 4 times.

At this time, the second step mentioned above is to determine which character out of eight characters corresponds to the currently sent PS code.
This is the address bit of the block and indicates the following correspondence.

Address bit character arrangement 0 0 1st and 2nd characters 0 1 3rd and 4th characters 1 0 5th and 6th characters 1 1 7th and 8th characters In this way, the information of the PS code currently being sent by the address bits is the station name. This designates the number of characters corresponding to the 8-character broadcasting station name, and by repeating the demodulation four times on the receiving/demodulating side, it becomes possible to demodulate the eight-character broadcasting station name.

[Prior art] Using the above-mentioned RDS system, listeners can tell what kind of program the radio broadcast they are currently listening to is.
You can know the name of the broadcasting station using the PTY code, and the PS code allows you to display the name of the broadcasting station on a display.

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

In the figure, a signal from an antenna 1 via a front end 2 and an FM 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 sent to a PS code decoder 8a.
The above-mentioned RDS data inputted to the RDS decoder 8 including the PTY data decoder 8b and demodulated with the RDS data 8 is given 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 provides PLL data to the PLL 6. A well-known channel selection operation is performed using the input section 11, or the reception band is sequentially swept in response to a sweep 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 operating the input section 11, and the system controller 9 gives channel selection information to the PLL 6. At this time, the frequency information, the broadcasting station name using the PS code, the program content using the PTY code, etc.
PTY that stores character information corresponding to the PTY code
After the information is converted into character information using a data table 9a and an ASCII code conversion tool 9b, it is displayed on a display 14 such as a dot matrix display tube via a character generator 12 and a liquid crystal driver 13.

When the RDS receiver shown in FIG. 6 sequentially sweeps within the band and the S meter detection circuit 7 detects the presence of a broadcasting station, the RDS decoder 8 decodes the PTY code from the second block of the RDS code. of,
By demodulating the PS codes from the fourth block, the system controller displays the information on the display 14 and stores the frequency information and PS codes in the memory 10.

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

[Problems to be Solved by the Invention] Conventional RDS receivers only learn the program content and station name being broadcast by the preset broadcasting station by calling up the preset broadcasting station as described above. If you want to listen to the news or are there sports broadcasts somewhere, call up all the preset channels or check the content of the broadcast station you caught while using the sweep command. However, in the case of a vehicle-mounted receiver, since the receiver is moved, it may not be possible to receive the desired type of program. 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 will also distract you while driving. It has become a kind of social problem because of its dangers.

[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. The broadcast stations obtained are classified by PTY code and stored in different groups of memories, and if at least one broadcast station is stored in that group memory, the broadcast stations assigned to that memory block are 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 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 a to n, and each memory 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 classification of PTY codes, as shown in FIG. The number of keys on this program type input section 15a is the same as the number of memory blocks.

When a sweep command is given to the system controller 9 by operating the key matrix 15, receivable broadcast stations are received using a well-known search function.
At this time, according to the data (numerical information) obtained by the PTY code decoder 8b of the RDS decoder 8, the memory control circuit 17 selects one of the predetermined memory blocks 10a to 10n classified in advance by major program type. The receiving station's frequency information and PS code are stored in the . For example PTY code
The news program given by No. “1” has 10 memory
In a, the memory control circuit 17 controls the memory so that the sports program given by PTY code No. "4" is preset in the memory 10b, and the broadcast station of a predetermined program type is preset in each memory block. Control write operations. As a result, after one round of searching, broadcasting station information classified by PTY code is stored in the memory block.

At the same time, the information obtained by the PTY decoder 8b is input to the PTY data table 9a, and the character information is stored in the buffer memory 16.

After completing one search and presetting, the system controller 9 displays the program type information stored in the buffer 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.

After confirming which program type is currently receivable from the display, the user operates the program type input section 15a of the key matrix 15 and presses, for example, the "Sports" key, thereby inputting information to the system controller. 9 notifies the memory control circuit 17 that "sports" has been selected;
The memory control circuit 17 calls the memory block 10b in which sports programs are stored, and converts the broadcasting station frequency information and PS code stored in the memory block 10b into the ASCII code conversion tool 9.
It is displayed on the display via b, etc. Fifth
The figure shows an example of the display at that time.

While viewing the broadcast station name and preset key number displayed on the display, the user can further select an appropriate broadcast station by operating the preset channel switch of the key matrix 15. It becomes possible.

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.

[Other Embodiments of the Invention] In the above embodiment, the broadcast stations stored in each memory block are written based on the search results, so they are arranged in frequency order. By sorting the detected S meter output in descending order of magnitude, the broadcasting station with the strongest electric field strength is displayed at the top of the display 14. It may also be used as a criterion. This is accomplished 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. Then, 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 sequentially compared with the field strength of the next preset station. By doing so, the broadcasting stations in each memory 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] This invention allows broadcast stations classified by major program types classified by PTY codes as described above to be stored in a plurality of memory blocks, and to collectively display the program types that can be received after a preset is completed. After confirming 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. This is extremely effective in selecting a desired program, and it becomes possible to receive unprecedented service provision from a receiver.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the data format of broadcast data used in the RDS system, Fig. 2 is a block diagram showing the configuration of the receiver of the present invention, and Fig. 3 is an example of the key matrix used in the present invention. 4 and 5 are front views showing an example of what is displayed on the display, and Fig. 6 is a front view showing an example of what is displayed on the display.
FIG. 2 is a block diagram showing the configuration of an RDS receiver. 8...RDS decoder, 9...System controller, 10a-10n...Memory block, 14...Display, 15...Key matrix, 16...Buffer memory, 17...Memory control circuit.

Claims (1)

[Claims] 1 A receiver that receives a broadcasting system that superimposes a data signal other than the main signal component on an FM broadcast wave and sends it out along with the broadcast signal, which includes a decoder that demodulates the data signal, and a decoder that demodulates the data signal, and the data demodulated by the decoder. A control circuit is provided for storing at least frequency information and broadcasting station name data information of a received broadcasting station in a memory block predetermined by classification based on content, and the control circuit stores at least frequency information and broadcasting station name data information of a received broadcasting station in a memory block predetermined based on classification, and the control circuit stores broadcasting information in at least one of the memory areas in the memory block. A radio data system receiver comprising display means for collectively displaying classification names given to memory blocks in which station information is stored.