JPH06338814A - Multiplex broadcast receiver - Google Patents

Abstract

PURPOSE:To suppress the omission of RDS data to a minimum by interrupting the reception of a receiving station conforming to the input timing of prescribed data with comparatively low frequency in use in the RDS data being received, and checking the receiving state of one alternate station during that time. CONSTITUTION:A controller 14 demodulates and inputs the RDS data sent by multiplexing with the FM broadcasting wave of the present receiving station via a BPF 9, an RDS decoder 10, and an error correction circuit 11, and stores it in data memory 14e. While, the detected output of a signal meter 12 is fetched at a fixed interval, and the receiving state is judged. When it is judged that the receiving state of the receiving station becomes worse, the controller 14 decides the input timing of a first block in which a PI code is arranged with comparatively low use frequency in the RDS data being received while the data is being inputted. The reception of the receiving station is interrupted conforming to the input timing of the PI code on a timing decision result, and the receiving state of the alternate station is checked during that time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex broadcast receiver which utilizes RDS data multiplexed on FM broadcast waves, and more specifically, it has a good reception state in accordance with the input timing of predetermined data of RDS data. The present invention relates to a multiple broadcast receiver that automatically selects the same program broadcasting station.

[0002]

Radio data systems (RDS) are FM
Various digital data related to broadcast information (RDS
Data) is frequency-multiplexed and broadcast, and is proposed by the European Broadcasting Union and put into practical use in European countries. A similar system is being studied in the United States. Table 1 shows RDS data.

[0003]

[Table 1]

As shown in the data structure of FIG. 7, RDS data is repeatedly multiplexed and broadcast with 104 bits (87.6 msec) as one group unit. One group consists of four blocks each having a 26-bit (21.9 msec) structure, and each block consists of a 16-bit information word and a 10-bit check word + offset word. In addition, each group is classified into 16 types of types 0 to 15 in 4 bits according to the content, and two versions A and B are defined for each type (0 to 15). PI codes (program identification codes) are arranged in the first blocks of all groups.

Therefore, on the side of a multiplex broadcast receiver using RDS, for example, when the reception state of the broadcast signal of the current receiving station is deteriorated due to a decrease in received electric field strength or an increase in noise due to multipath, it is included in the RDS data. By utilizing the AF list and PI code, etc., the other stations that are broadcasting the same program and have a good reception status are automatically selected, or the current receiving station or the broadcasting stations of other networks are used for traffic information broadcasting. When the traffic starts, it becomes possible to automatically switch from another source such as tape to a radio by using TP, TA data, etc. and listen to the traffic information ("Nikkei Electronics", August 1987). See No. 24).

In order to automatically select the same program broadcasting station having a good reception state, the reception state of the AF station is checked by switching the front end from the reception station to an alternative station (AF station) on the AF list. It is also necessary to check whether the PI codes of the AF station and the receiving station match.
As a multiplex broadcast receiver capable of such automatic channel selection,
There are a two-tuner system using two tuners and a one-tuner system using one tuner.
At present, single-tuner multiplex broadcast receivers are mainly used in terms of cost.

[0007]

In the above-mentioned one-tuner multiplex broadcast receiver, the broadcast reception from the receiving station is interrupted when the AF station is checked and the PI code thereof is checked. Generally, one AF station can be checked in a shorter time (10 to 20 msec) than the PI code check time (100 msec or more).
The interruption time of the receiving station required for the checking operation of the two AF stations has almost no effect on the audio signal such as music and conversation. However, the input of the RDS data of the receiving station is also interrupted during the checking of the AF station, which causes a loss of data. In recent years, the information amount of RDS data such as EON and TMC is increasing, and the data cycle tends to be long. Therefore, if the check of a plurality of AF stations included in the AF list is prioritized, the RDS data from the receiving station will be transmitted. The problem that it takes a long time to input all, conversely, if the input of RDS data from the receiving station is prioritized, the check of all AF stations is delayed, so the automatic channel selection operation is delayed and the recovery of the reception state is delayed. The problem arises.

In view of the above problems, it is an object of the present invention to improve both the input efficiency of RDS data multiplexed on a broadcast wave being received and the efficiency of checking the reception status of an alternative station based on the RDS data. An object of the present invention is to provide a multi-broadcast receiver that can be used.

[0009]

The invention according to claim 1 is
The receiving status of the alternative station is checked based on the alternative station frequency list included in the RDS data multiplexed in the broadcast wave of the receiving station, and the same program broadcasting station with a good receiving status is selected based on the check result. In a multiplex broadcast receiver including a station control unit, the channel selection control unit includes a timing determination unit that determines an input timing of predetermined data that is relatively infrequently used among RDS data that is being received; It is characterized by further comprising: an alternative station check unit for interrupting the reception of the receiving station at the input timing of the predetermined data based on the determination result, and checking the reception state of one alternative station during that time.

According to a second aspect of the present invention, in the multiplex broadcast receiver according to the first aspect, the RDS data is repeatedly multiplexed and broadcast with a predetermined number of bits of data as one group unit. And the predetermined data is a program identification code arranged in a predetermined block of each group.

According to a third aspect of the present invention, in the multiplex broadcast receiver according to the first aspect, the tuning control section determines whether the receiving state of the receiving station is good or bad, and operates the timing determining section when the receiving state is bad. RDS of the receiving station and the alternative station
And a program identification code check unit that compares the program identification code included in the data with the program identification code included in the RDS data of the receiving station to check whether the two codes match. If the reception status of the alternative station is worse than the reception status of the receiving station, the check processing of the alternative station is terminated, and the reception status of the alternative station is greater than the reception status of the receiving station. Is good, the program identification code check unit is operated, the program identification code check unit ends the channel selection when the two codes match, and ends the checking process of the AF station when they do not match. And

According to a fourth aspect of the present invention, in the multiple broadcast receiver according to the first aspect, the tuning control section further includes a data storage processing section for storing the check result of the alternative station check section in a data storage section. A reception state determination unit that determines whether the reception state of the reception station is good or bad, and a reception state based on the check result stored in the data storage processing unit when the reception state determination unit determines that the reception state of the reception station is bad. Is the best alternative station and the program identification code included in the RDS data of the broadcast wave received from this alternative station is compared with the program identification code of the receiving station to determine whether the two codes match. And a program identification code check unit for terminating the channel selection when both codes match and deleting the data of the alternative station and operating the selection processing unit when they do not match. And it features.

It is preferable that the reception state determination unit includes a level check unit for checking the level of the received electric field strength, and a noise check unit for checking the amount of reception noise due to multipath together with the level check unit. More preferably.

[0014]

In the multiplex broadcasting receiver according to the first aspect, in the tuning process of the tuning controller, first, the timing determination unit determines the input timing of the predetermined data of the RDS data which is being received and which is less frequently used. Based on the result of the determination, the alternative station check unit interrupts the reception of the receiving station at the input timing of the predetermined data, and checks the receiving state of one alternative station during that time, so that there is no loss of other RDS data. Can be kept to a minimum. Further, since the input of the information data is interrupted at the above timing to check the alternative station, the check delay of the alternative station can be minimized. Therefore, both the input of RDS data and the check of the alternative station can be efficiently performed.

In the multiplex broadcast receiver according to the second aspect, reception by the receiving station is performed in accordance with the input timing of the program identification code arranged in a predetermined block of all groups of RDS data in which a plurality of blocks are set as a group unit. Since the reception status of one alternative station is checked during the interruption, it is possible to repeat the check of the alternative station in the minimum cycle of one group while minimizing the interruption of the data input of other blocks in each group. it can.

In the multiplex broadcast receiver according to the third aspect, the timing determination unit operates when the reception state determination unit of the channel selection control unit determines that the reception state of the receiving station is poor,
Based on the determination result, the alternative station check unit checks the reception state of one alternative station at the input timing of predetermined data. Then, the alternative station check unit compares the reception statuses of the alternative station and the receiving station, and when the reception status of the alternative station is worse than the reception status of the receiving station, the check processing of the alternative station is terminated and the reception status of the alternative station. When is better than the receiving condition of the receiving station, the program identification code check unit is operated. The program identification code check unit compares the program identification code included in the RDS data of the alternative station with the program identification code of the receiving station, and terminates the channel selection when both codes match. In this way, if the reception status of the checked alternative station is better than the reception status of the receiving station, the program identification code is continuously checked, and if the program identification code of the alternative station and the receiving station match, the alternative station is selected. Since the selection of a new receiving station is completed, the receiving state of the broadcast can be quickly changed to a better state.

In the multiplex broadcasting receiver according to the fourth aspect, since the result of the reception state check performed by the alternative station check unit is temporarily stored in the data storage unit, it is minimized when the reception state of the receiving station is good. The reception status of the alternative station can be checked by interrupting the data input. Then, when the reception status determination unit determines that the reception status of the receiving station is poor, the alternative station with the best reception status is selected based on the check result stored in this data storage, and the reception is received from this alternative station. When the reception status of the receiving station deteriorates, the program identification code included in the RDS data of the broadcast wave is compared with the program identification code included in the RDS data of the receiving station, and if both codes match, the channel selection ends. It is possible to quickly select the same program broadcasting station with the best reception status.

[0018]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 is a principal block diagram showing the configuration of an RDS multiplex broadcast receiver according to the first embodiment of the present invention. This multiplex broadcast receiver can be used, for example, as a car radio or as a car audio by being integrated with a tape cassette, a deck, or the like. In the figure, 1 is an antenna, 2 is a front end, which tunes to a predetermined broadcasting station based on a tuning voltage signal output from the PLL circuit 3,
An intermediate frequency signal (IF signal) is generated. Reference numeral 4 is an intermediate frequency amplifier, which is an IF output by the front end 2.
Amplifies the signal to a predetermined level. Reference numeral 5 denotes a stereo demodulation circuit (MPX), which is I input from the intermediate frequency amplifier 4.
Demodulate the F signal into a stereo signal. 6 is a mute circuit,
7 is an amplifier (AMP), 8 is a speaker, and the amplifier 7
It is driven by and outputs voice.

9 is a 57 KHz bandpass filter (B
PF), which passes a 57 KHz subcarrier modulated based on the RDS data having the data structure shown in FIG. An RDS decoder 10 demodulates various data such as PI code and AF list from the output of the bandpass filter 9. Reference numeral 11 is an RDS data synchronization error correction circuit, which is a PI code demodulated by the RDS decoder 10.
An error in RDS data such as an AF list is detected while synchronizing with each group, and the error is corrected.

A signal meter 12 detects the received signal level (electric field strength) using the IF signal output from the intermediate frequency amplifier 3. Reference numeral 13 denotes a station detector, which determines that a receiving station exists when the received signal is within the frequency deviation Δf (bandwidth) of the received signal and the signal strength is equal to or higher than a predetermined level. Therefore, when the station detect signal SD is at a low level, even if the signal intensity detected by the signal meter 12 is high,
The broadcasting station at the tuning point does not actually exist, and it is determined that the detected signal strength is influenced by the adjacent station.

Reference numeral 14 denotes a controller composed of a microcomputer, which includes a processor (CPU) 14a, a program memory (ROM) 14b, and a data memory (RA).
M) 14c and the like. Reference numeral 15 is an operation unit. The controller 14 sequentially executes programs previously stored in the program memory 14a by the processor 14a, and fetches broadcast-related information data such as PI code and AF list in RDS data sequentially input in groups from the error correction circuit 11. Stored in the data memory 14c with the PLL circuit 3 based on the tuning instruction from the operation unit 15.
The frequency division ratio of the program frequency divider (not shown) is controlled to tune the front end 2 to a predetermined broadcasting station. Also, for example, when the AF list, PI code, etc., taken from the RDS data are used to perform the automatic tuning process described later, or when the traffic information broadcast is started at the receiving broadcasting station or the broadcasting station of another network. , TP, TA data, etc., can be used to automatically switch from another source (not shown) such as a tape to a radio mode to listen to the traffic information.

Next, the automatic channel selection processing function of the multiplex broadcast receiver will be described in detail. The controller 14 of the multiplex broadcast receiver functions as an automatic tuning control unit by executing the automatic tuning processing program stored in the program memory 14b. The station control unit determines the input timing of the first block in which the PI code that is relatively infrequently used is placed in the RDS data being received, and based on the timing determination result, the receiving station matches the input timing of the PI code. Is interrupted and the reception status of one alternative station (AF station) is checked during that time. As described above, since the PI code is placed in the first block of all group types in the RDS data, if one AF station check is performed in accordance with the input timing of the PI code, the AF station will be cycled in groups. The check can be repeated. Moreover, since the PI code is not frequently changed during program broadcasting, once the PI code of the receiving station is acquired,
Even if the input of the PI code is interrupted thereafter, there is almost no problem. Therefore, it is preferable to match the AF station check with the input timing of the first group.

More specifically, in one embodiment of the present invention, the automatic channel selection processing is performed according to the flow charts shown in FIGS. With reference to these figures,
The controller 14 first demodulates and inputs the RDS data multiplexed and transmitted to the FM broadcast wave of the current receiving station via the bandpass filter 9, the RDS decoder 10 and the error correction circuit 11, and stores it in the data memory 14c. on the other hand,
The detection output of the signal meter 12 is taken in at a constant time interval (for example, 2.5 sec) to determine whether or not the electric field strength of the broadcast wave of the current receiving station is at a predetermined level or higher, that is, whether the reception state is good or bad. Determine (Step 10
1).

When it is determined that the reception state of the receiving station is in a deteriorated state, the controller 14 determines whether or not RDS data is being input (step 102), and data is being input (YE
In the case of S), it waits until the fourth block (see FIG. 7) of the RDS data signal is received (step 103). In addition,
The first to fourth blocks can be discriminated by checking the offset words A to D included in each block.
When the reception (YES) of the fourth block is confirmed, the timer is set to, for example, 22 msec (step 104), and the AF station check process (steps 201 to 20) shown in FIG.
Proceed to 8). Therefore, the AF station check is executed at the input timing of the first block in which the PI code is arranged. Also, when it is confirmed in step 102 that the RDS data is not input (NO), the AF station check process (steps 201 to 20) is performed.
Proceed to 8).

In this AF station check processing, first, a mute command signal is sent to the mute circuit 6 to mute the sound (step 201) and the data memory 1
The i-th AF station frequency (the initial value of i is 1) is calculated from the AF list stored in 4c, and the i-th AF station frequency is stored in the PLL circuit 3.
Command the reception of the second AF station,
Tuning to the F station frequency (step 202).

Next, in the state of being tuned to the i-th AF station, it is checked whether or not the output signal SD of the station detector 13 is high level (step 203). If it is high level, there is a receiving station. , The detection output from the signal meter 12 is fetched, and the reception level of the i-th AF station is compared with the reception level of the reception station previously stored in the data memory 14c (step 204). When the reception level of the AF station is higher than the reception level of the reception station, the steps 210 to 21 are continued.
The program identification code check (PI check) process up to 2 is performed, but when the reception level of the AF station is lower than the reception level of the reception station, the processes of steps 205 to 209 are performed. In the step 203, the output signal SD
When is not at a high level, there is no receiving station at the AF frequency, so that the process proceeds to steps 205 to 209 in the same manner. That is, it is checked whether the i-th AF station is the last AF station in the AF list (step 205), and if it is not the last AF station, i is incremented by i + 1 → i (step 206). 2 is reset to the initial value 1 (step 207), the front end 2 is frequency-tuned to the original receiving station (step 208), the audio mute is released (step 209), and step 105 in FIG.
Proceed to.

Therefore, the multiplex broadcast receiver will again receive the RDS data signal of the receiving station. Therefore, the controller 14 takes in the demodulated RDS data (step 105), and the RDS data is offset B
Is included, that is, whether the captured RDS data is the second block is checked (step 105). If not offset B, step 10
In step 7, it is checked whether the timer time set in step 104 has exceeded 22 msec. In general, one AF station check process described above (step 2
Since 01 to step 209) can be performed within 22 msec, that is, during the transmission time of the PI code of the first block, the data of the first block may be fetched when the input of the RDS data of the receiving station is restarted. Many. Therefore, when 22 msec has not elapsed, the process returns to step 105 to continue inputting RDS data. Then, when the offset B is confirmed in step 106, the process proceeds to step 109 to restart the input of necessary information data. On the other hand, if 22 msec has elapsed in step 107, group synchronization input processing is performed in step 108 to determine the group type of the RDS data, and then the process proceeds to step 109.

On the other hand, in step 204 of FIG.
When it is determined that the reception level of the station is higher than the reception level of the reception station, the PI check processing from step 210 to step 212 is performed as described above. That is, the controller 14 first determines the RDS of the broadcast wave of the AF station.
The PI code included in the data is fetched (step 210), and it is checked whether or not the PI code of the AF station matches the PI code of the receiving station already stored (step 211). If the PI codes match, the AF station is the same network station that broadcasts the same program as the receiving station, so i is reset to an initial value of 1 in step 212, and then audio muting is performed in step 213. Cancel and end the tuning process. Therefore, the i-th A
Station F becomes a new receiving station to continue receiving the broadcast, and the same program can be listened to in a better receiving state than the original receiving station.

On the other hand, when the PI codes do not match in step 211, the AF station is another network station or non-network station. Therefore, PI
If the codes do not match, the above steps 205 to 2
In step 09, the check of the i-th AF station is completed.

In the first embodiment, step 204
Since the reception level of the AF station and the reception level of the reception station are compared in, the reception level (electric field strength) of the selected station is higher than the reception level (electric field strength) of the original reception station, but it has reached a certain level. It may not be possible. Therefore, in such a case, the automatic channel selection processing shown in FIGS. 2 and 3 is executed again.

FIGS. 4 to 6 show the channel selection processing operation of the second embodiment of the present invention. The block configuration of the second embodiment is the same as that of the first embodiment.

In the second embodiment, as shown in FIGS. 4 and 5, when the reception state of the current reception station is good, the reception state of the AF station is checked and the check result is stored in the data memory. However, when the receiving state of the receiving station becomes poor, the AF station having the best receiving state is selected based on the check result stored in the data memory as shown in FIG.

More specifically, the controller 14 of the second embodiment first checks whether or not RDS data is being input while receiving the current receiving station (step 301),
Next, it is checked whether or not the fourth block of RDS data has been input (step 302). Then, when the RDS data is not input and when the fourth is input, the timer is set to 22 msec (step 303) and the AF station check process shown in FIG. 5 is performed. That is, first, the audio mute command signal is output to the mute circuit 6 (step 401), and the AF stored in the data memory 14c is detected.
The i-th AF station frequency is obtained from the list (i is initially 1), the PLL circuit 3 is instructed to receive the i-th AF station, and the front end 2 is tuned to the AF station frequency (step 402). ).

Next, in the state of being tuned to the i-th AF station, it is checked whether the output signal SD of the station detector 13 is high level (step 403). If it is high level, there is a receiving station. , The reception level detection signal output from the signal meter 12 is fetched (step 404) and stored in the data memory 14c as the check result of the i-th AF station (step 4).
05).

After checking one AF station in this way, it is checked whether or not the i-th AF station is the last AF station in the AF list (step 406). Then, based on the frequency data of the original receiving station stored in the data memory 14c, the PLL circuit 3 is instructed to receive the receiving station and the front end 2 is tuned to the receiving station frequency (step 407). Four
08). Then, a mute release command is output to the mute circuit 6 (step 409), and steps 304 to 3 in FIG.
Go to 08. Steps 304 to 308 of FIG.
The processing up to is the same as the processing from step 105 to step 109 of the first embodiment.

On the other hand, when the i-th AF station is the final AF station in step 406, i is reset to the initial value 1 (step 410), and the frequency data of the original receiving station stored in the data memory 14c. Based on the above, the PLL circuit 3 is instructed to receive the receiving station, and the front end 2 is tuned to the receiving station frequency (step 411). And
A mute release command is output to the mute circuit 6 (step 412), and the check process is ended.

In this way, when the check of the final AF station is completed, the reception level data of all the AF stations whose station detection signals have been confirmed are stored in the data memory 14c. The check of one AF station is performed within the PI code transmission time according to the input timing of the PI code.
It does not hinder the input of S data. If the above AF station check processing is repeated at regular time intervals during reception by the current receiving station, the latest check result of each AF station can be stored.

On the other hand, during reception by the receiving station, the controller 14
Performs the automatic channel selection processing of FIG. 6 at regular time intervals (for example, 2.5 sec). That is, it is checked by the detection output of the signal meter 12 whether or not the reception level (electric field strength) of the broadcast wave of the current receiving station is above a certain level, that is, whether the reception state is good or bad (step 50).
1). If the reception level of the receiving station is below a certain level,
The controller 14 sorts the check results (reception level data) of the AF stations stored in the data memory 14c and selects the AF station having the highest reception level (step 502). Then, a mute command signal is sent to the mute circuit 6 to mute the sound (step 503), the frequency of the selected AF station is obtained from the AF list stored in the data memory 14c, and the PLL circuit 3
To instruct the front end 2 to tune to the frequency of the AF station (step 504).

Next, in the state of being tuned to the selected AF station, the controller 14 first determines the RD of the broadcast wave of the AF station.
The PI code included in the S data is taken in (step 505), and it is checked whether or not the PI code of the AF station matches the PI code of the receiving station (step 50).
6). When the PI codes do not match, the AF station is another network station or non-network station.
Therefore, when the PI codes do not match, the reception level data of the AF station is deleted from the data memory 14c in step 508 described above, and the process returns to step 502. Therefore, in the next step 503, the remaining A
The AF station having the highest reception level is selected from the F stations, and the processing from step 503 onward is performed for the AF station.

On the other hand, if the PI codes match in step 506, the AF station is the same network station that is broadcasting the same program as the receiving station.
At 7, the audio mute is released, and the channel selection process ends.

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment of the above embodiment,
Various changes can be made to the components. For example, as a modified example of the first embodiment, it may be determined in step 204 whether the electric field strength of the AF station is equal to or higher than a certain level. In this case, if the electric field strength is above a certain level, A
The number of AF station checks before searching for the F station may increase, but when the tuning is completed after the PI check, the same program broadcast in a good reception state can be heard.

It is also possible to match the input timing of other relatively infrequently used information data. For example,
Since the PI code is similarly arranged in the third block in the type 0B to 15B groups, the AF station check may be performed according to the input timing of the third block in the version B group.

Further, in the reception state discrimination processing, the number of times that the PLL circuit 3 is unlocked due to the influence of the multipath noise is counted. When the number of unlocks is a certain number or more, the received electric field strength is a certain level or more. Even if there is, it may be configured to determine that the reception state is in a deteriorated state (see Japanese Patent Application Laid-Open No. 4-280508).

[0045]

As is apparent from the above description, according to the present invention, the reception of the receiving station is interrupted at the input timing of the predetermined data of the RDS data which is being received and which is used relatively infrequently. Since the reception statuses of the two alternative stations are checked, the loss of other RDS data can be minimized and the check delay of the alternative station can be minimized. Therefore, it is possible to provide a multiplex broadcast receiver that can efficiently perform both RDS data input and alternative station check.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a multiplex broadcast receiver showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation content of a channel selection control unit in the first embodiment.

FIG. 3 is a flowchart showing the operation contents between steps A and B of FIG.

FIG. 4 is an AF of a tuning control unit in the second embodiment of the present invention.
It is a flow chart which shows the contents of a check operation.

5 is a flowchart showing the operation contents between steps A and B of FIG.

FIG. 6 is a flowchart showing the contents of tuning operation of a tuning control unit in the second embodiment.

FIG. 7 is a diagram showing a data format of RDS data.

[Explanation of symbols]

 14 Controller (Channel Selection Control Unit) 14a Processor 14b Program Memory 14c Data Memory

[Table 1]

Claims (4)

[Claims] 1. An RDS multiplexed on an FM broadcast wave of a receiving station
A multiplex broadcasting receiver equipped with a tuning control unit that checks the reception status of the alternative station based on the alternative station frequency list included in the data and selects the same program broadcasting station with a good reception status based on the check result. In, the tuning control unit,
A timing determination unit that determines the input timing of predetermined data that is relatively infrequently used among the RDS data that is being received, and the reception of the receiving station is interrupted at the input timing of the predetermined data based on the determination result of the timing determination unit. A multiplex broadcast receiver having an alternative station check unit for checking the reception status of one alternative station in the meantime. 2. The RDS data is repeatedly multiplexed and broadcast with a predetermined number of bits of data as one group unit, and one group is composed of a plurality of blocks,
2. The multiplex broadcast receiver according to claim 1, wherein the predetermined data is a program identification code arranged in a predetermined block of each group. 3. The channel selection control unit determines whether the receiving state of the receiving station is good or bad, and operates the timing determining unit when the receiving state is bad, and a program identification included in the RDS data of the alternative station. A program identification code check unit that compares the code and the program identification code included in the RDS data of the receiving station to check whether the two codes match.
The alternative station check unit compares the reception statuses of the alternative station and the receiving station. When the reception status of the alternative station is worse than the reception status of the receiving station, the check processing of the alternative station is terminated, and the reception status of the alternative station is When the reception condition of the receiving station is better, the program identification code check unit is operated, and when the both codes match, the program identification code check unit ends the channel selection, and when they do not match, the AF station check process 2. The multiplex broadcast receiver according to claim 1, wherein 4. The channel selection control unit further stores a data storage processing unit that stores the check result of the alternative station check unit in a data storage unit; When the reception state determination unit determines that the reception state of the receiving station is bad, a selection processing unit that selects an alternative station with the best reception state based on the check result stored in the data storage processing unit, and from this alternative station The program identification code included in the received RDS data of the broadcast wave is compared with the program identification code of the receiving station to check if both codes match. If both codes match, the channel selection is terminated and there is a mismatch. 2. The multiplex broadcast receiver according to claim 1, further comprising: a program identification code check unit that operates the selection processing unit by deleting the data of the alternative station.