JP2688353B2 - Receiver with control function by radio data - Google Patents

Description

TECHNICAL FIELD The present invention relates to a receiver of a radio data system (hereinafter referred to as RDS).
(Referred to as a receiver). BACKGROUND ART When a broadcast station broadcasts, broadcast-related information such as information related to the program content is transmitted as data by multiplex modulation, and a desired program content can be selected on the receiving side based on the demodulated data. Radio data system (RD)
S) there. In this radio data system, 57 kHz, which is the third harmonic of the 19 KHz stereo pilot signal outside the frequency band of the FM modulation wave, is used as a subcarrier, and the subcarrier is filtered and biphase-coded. The radio data signal is amplitude-modulated by a data signal indicating information related to the broadcast such as the content, and the amplitude-modulated subcarrier is frequency-modulated to the main carrier for broadcasting. As is clear from FIG. 4 showing the baseband coding structure of the radio data signal, 104 bits correspond to 1 bit.
It is repeatedly multiplexed and transmitted as a group. One group is composed of four blocks each having a 26-bit configuration, and each block is composed of a 16-bit information word and a 10-bit check word. In FIG. 5, a block 1 broadcasts a program recognition (PI) code representing a network, a block 2 broadcasts a traffic program identification (TP) code or a traffic announcement identification (TA) code, and a block 3 broadcasts the same program. The station frequency (AF) data of the existing network station and the program service name information (PS) data such as the broadcast station name and the network name are arranged in the block 4. In addition, each group has 4 bits of type 0 to 15 according to its contents.
There are 16 distinctions, and two versions A and B are defined for each type (0 to 15), and these identification codes are arranged in block 2. In addition,
The AF data of the network station is transmitted only in the type 0A group, and the PS data is transmitted in the type 0A and 0B groups. On the other hand, in the type 3 group, related information of another network station different from the network of the own station, that is, the network to which the currently received broadcast wave including this radio data belongs is transmitted. FIG. 6 shows the format of the type 3A group. AF data of another network station is arranged in the block 3 of the type 3A group, and the PI code and the program number (as the information related to the other network station are stored in the block 4). PIN) code, TP code, program type (PTY) code,
Either the TA code or AF data is the code of block 2
It is arranged according to the contents of C ₁ and C ₀ . The information of this block 4 is also transmitted to the block 4 of the type 3B group. Store address codes D ₂ , D ₁ and D ₀ of block 2 are provided in order to determine the type of another network being transmitted in consideration of the presence of a plurality of different other networks.
Up to three, related information of other networks can be transmitted. By the way, when one RDS broadcast is received, related information of each station belonging to another network different from the broadcast network can be obtained. Therefore, by utilizing this information, a program different from the program currently being received is broadcast. It would be convenient if I could quickly switch to RDS broadcasting on the same network and listen to another program. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a receiver having a radio data control function capable of quickly selecting a broadcasting station of a network different from the currently receiving broadcasting station by utilizing related information of another network. Is to provide. A receiver according to the present invention is capable of receiving multiple broadcast waves in which radio data including self-other network information is multiplexed, and includes a preset memory for storing at least one frequency data belonging to the same network for each preset channel, A receiver having a control function by radio data capable of preset tuning using frequency data stored in the preset memory, demodulation means for demodulating a radio data signal from a received broadcast wave,
Frequency data related to at least one other network different from the network to which the received broadcast wave belongs is read from the radio data signal, and the frequency data related to the other network is associated with the preset channel corresponding to the other network in the preset mode. And a control means for storing the preset memory in a preset memory. Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the RDS receiver to which the present invention shown in FIG. 1 is applied, the FM multiplex broadcast wave received by the antenna 1 is selected by the front end 2 at a desired station and converted to an intermediate frequency (IF). , Is supplied to the FM detector 4 via the IF amplifier 3. The front end 2 obtains the local oscillation signal to the mixer by the PLL synthesizer method using the PLL circuit including the programmable frequency divider, and the frequency division ratio of the programmable frequency divider is controlled by the controller 14 described later. The channel selection operation is performed by. The detection output of the FM detector 4 is supplied to an MPX (multiplex) demodulation circuit 5 and, in the case of stereo broadcasting, separated into L (left) and R (right) channel audio signals. When the detection output of the FM detector 4 passes through the filter 6, a 57 KHz subcarrier amplitude-modulated by the biphase-coded data signal, that is, a radio data signal is extracted and demodulated by the PLL circuit 7. . This demodulated output is supplied to a digital (D) PLL circuit 8 and a decoder 9.
Supplied to In the D-PLL circuit 8, a clock for data demodulation is generated based on the demodulated output of the PLL circuit 7. The generated clock is supplied to the gate circuit 10. The lock detection circuit 11 detects that the D-PLL circuit 8 has locked, generates a lock detection signal, and supplies this to the gate circuit 10 to control the circuit 10 to open. The decoder 9 decodes the biphase-coded data signal, which is the demodulated output of the PLL circuit 7, in synchronization with the clock generated by the D-PLL circuit 8. As shown in FIG. 4, the output data of the decoder 9 is a 104-bit group unit consisting of 4 blocks having a 26-bit structure, and is sequentially supplied to the group / block synchronization & error detection circuit 12. The group / block synchronization & error detection circuit 12 synchronizes the group with the block based on the 10-bit offset word assigned to the 10-bit check word of each block, and 16-bit information based on the check word. Word error detection is performed. Then, the error-detected data is supplied to the controller 14 after the error is corrected by the error correction circuit 13 at the next stage. The controller 14 is composed of a microcomputer, and code information of each block in the radio data that is sequentially input in units of groups, that is, radio data information related to the program content of the broadcasting station currently being received (the PI code and AF data described above). , PS data, etc.) and capture it in the memory 15. In addition, the selection is performed by controlling the reception frequency data value that determines the frequency division ratio of the programmable frequency divider (not shown) of the PLL circuit that forms a part of the front end 2 based on the tuning instruction from the operation unit 16. Perform station operation.
The reception frequency data value is, for example, the count value of the counter. The memory 15 is composed of a nonvolatile RAM in which data such as reception frequency data, PI code, AF data, etc. is written, and a ROM in which programs and data are written in advance.
This RAM has preset channel 1 as shown in Fig. 2.
A preset storage area in which frequency data for 8 stations can be written for each channel from ch to 6 is formed. Further, the operation unit 16 is provided with a plurality of operation buttons such as an auto preset button 23 for designating an auto preset operation and preset channel buttons “1” to “6” 25 for preset channel selection. When any one of the preset channel buttons “1” to “6” 25 is operated, the controller 14 reads, for example, the first station data of the plurality of frequency data stored in order in the selected preset channel. And sets it as the reception frequency data in the frequency divider of the PLL circuit.
When the same preset channel button 25 is operated again, the data of the second station of the plurality of frequency data is read and set as the received frequency data in the frequency divider of the PLL circuit, and the frequency data of eight stations is stored. If the same preset channel button 25 is operated 9 times, the cycle is cycled and the frequency data of the first station is read out again. Next, the operation of the processor of the controller 14 showing the procedure of the control method according to the present invention will be described with reference to the flow chart shown in FIG. The processor first inputs the data supplied from the error correction circuit 13 (step 51) and determines whether or not it is other network related information (step 52). If the information is related to another network, the store address codes D ₂ , D ₁ and D ₀ of block 2 are read (step 53), and the AF data of the other network station is read in block 3 (step 54). As shown in Fig. 6, 1 group can contain AF data for 2 stations.
AF data for one or two stations on the same other network can be read by group transmission. Then, it is determined whether or not the auto preset is designated by the operation of the auto preset button 23 (step 55), and if the auto preset is designated, the read store address codes D ₂ , D ₁ and D ₀ are set. Accordingly, the preset channel is set (step 56). In other words, when auto preset is specified, it becomes a preset mode in which the necessary frequency data can be automatically stored in the corresponding preset storage area.In other than this mode, the user can manually store the desired frequency data in the preset channel storage area. I will remember. In step 56, it is determined which preset channel of the preset storage area stores the frequency data of the station of another network different from the network to which the received wave belongs, which is taken in from the received wave. More specifically, in this flow, by designating the memory address indicating the storage area of the preset channel corresponding to the store address codes D ₂ , D ₁ , and D ₀ that classify the other network acquired from the received wave in this flow. The preset channels are set. It is determined whether or not the AF data for 8 stations has already been written in the preset storage area corresponding to the set preset channel by the auto preset (step 57). If the AF data for 8 stations has not been written, it is set. Write the read AF data as frequency data in the empty position of the preset memory area corresponding to the preset channel (step 5
8). If the frequency data for 8 stations has been written, the read AF data is not written. Therefore, by repeating this operation, it is possible to write the AF data of another network different from the current received wave into each storage area associated with the preset channel corresponding to the other network, for each channel at most 8 stations. it can. The preset channel setting operation in step 56 is, for example, determined from the preset channel 1ch in the order of the store address codes D ₂ , D ₁ and D ₀ read after the designation of the auto preset. Further, the user may be allowed to specify the preset channel by button operation each time the read store address codes D ₂ , D ₁ and D ₀ are different. In this case, store address codes D ₂ , D ₁ ,
It is better to read all AF data for 8 stations for each D ₀ and 1 network and place them to let the user specify the preset channel. Further, up to eight AF data of other networks can be obtained by the store address codes D ₂ , D ₁ and D ₀ , but when the number of other networks is the preset channel number of 6 channels as in the above embodiment. Anything beyond that number of channels is ignored. In the embodiment described above, even if there is a channel in which frequency data is already stored in the preset storage area before the designation of the auto preset, it is assumed that all the frequency data is erased by the designation of the auto preset. Not limited to this, AF data of another network may be automatically preset only to preset channels in which frequency data is not stored. Further, it is not limited to writing the AF data in the preset storage area each time the AF data is read from the received wave, and the AF data for eight stations may be read and then written in the preset storage area. Further, although the store address codes D ₂ , D ₁ and D ₀ are used as the type data of the other network in the above-mentioned embodiment, the PI code can also be used. As described above, according to the present invention, frequency data relating to at least one other network different from the network to which the received broadcast wave belongs is read from the radio data signal obtained from the received broadcast wave, and preset. In the mode, the frequency data related to the other network is
Since it is stored in the preset memory in correspondence with the preset channel corresponding to the other network, it is possible to set the frequency data of the broadcasting station of the other network different from the network of the broadcasting currently being received in the preset channel, After the setting, the preset memory is used to facilitate the operation of receiving the broadcast of the other network, so that the broadcast station of the other network can be quickly selected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an RDS receiver to which the present invention is applied, FIG. 2 is a diagram showing a preset storage area in a RAM, and FIG. 3 is a receiver shown in FIG. FIG. 4 is a flowchart showing the operation of the processor in the controller, FIG. 4 is a diagram showing the baseband coding structure of the radio data signal, FIG. 5 is a diagram showing the format of the type 0A group, and FIG.
The figure shows the format of a type 3A group. Description of symbols of main parts 1 ... Antenna 2 ... Front end, 4 ... FM detector 5 ... Multiplex demodulation circuit 8 ... Digital PLL circuit 9 ... Decoder, 14 ... Controller

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Junichi Nishida               Saitama Prefecture Kawagoe City Oji Yamada 25 Nishimachi 1               Pioneer Corporation Kawagoe Factory                (56) References JP-A-56-89123 (JP, A)                 JP 59-25430 (JP, A)                 "Nikkei Electronics" August 1987               24th issue P. 202 ~ 217

Claims (1)

(57) [Claims] A preset memory that can receive multiple broadcast waves in which radio data including own and other network information is multiplexed and that stores at least one frequency data belonging to the same network for each preset channel is stored in the preset memory. A receiver having a control function by radio data capable of preset tuning using frequency data, comprising demodulation means for demodulating a radio data signal from a received broadcast wave, and the received broadcast wave from the radio data signal. The frequency data related to at least one other network different from the network to which the other network belongs, and the frequency data related to the other network in the preset mode are stored in the preset memory in association with the preset channel corresponding to the other network. Receiver having a control function by radio data, characterized in that it comprises a control means, a to.