JP6587496B2 - Broadcast receiving apparatus and alternative broadcast channel checking method - Google Patents

Description

  The present invention relates to a network follow technique in a broadcast receiving apparatus.

  2. Description of the Related Art Radio broadcasting that performs audio broadcasting with data, such as RDS (Radio Data System), has been known. The data broadcast in these radio broadcasts contains information on frequency channels that broadcast the same program, called AF. Radio receivers that receive such radio broadcasts refer to AF. The frequency channel that is being received when the reception status of the frequency channel that is being received deteriorates and AF check is performed to check the reception status of each other frequency channel that is currently broadcasting the same program as the frequency channel that is being received. An NF (network follow) operation is performed to switch the frequency channel to be received to a frequency channel having a good reception state among other frequency channels that are broadcasting the same program.

  In addition, as a radio reception apparatus that performs such NF operation, in a radio reception apparatus that uses two tuners to receive a program from one frequency channel by the phase diversity method, the reception state of the frequency channel being received is A radio receiver is known that uses one tuner for program reception and the other tuner for AF check if it deteriorates (for example, Patent Document 1).

  The television / radio receiver includes three tuners, a first tuner, a second tuner, and a third tuner. The first tuner and the second tuner are used to receive two different programs, and the third tuner is used. A technique for searching for a channel that broadcasts the same program as the program received by one of the first tuner and the second tuner is also known (for example, Patent Document 2).

JP 2007-288631 A JP 2006-304073 A

  When the radio receiving apparatus includes first, second, and third tuners, the first tuner and the second tuner are used for receiving different programs, and the third tuner is used for AF check, the third tuner If the tuner is used only for the AF check of the frequency channel received by one of the first tuner and the second tuner, the AF check of the frequency channel received by the other tuner cannot be performed. NF operation cannot be performed with respect to the tuner.

  On the other hand, when the third tuner performs the AF check of the frequency channel received by the first tuner and the AF check of the frequency channel received by the second tuner in this order, the second tuner It takes a relatively long time to complete the tuner AF check. Then, since the NF operation of the second tuner cannot be performed until the AF check of the second tuner is completed, when the reception state of the second tuner is deteriorated before the AF check of the second tuner is completed, The NF operation of the second tuner cannot be performed promptly.

  Therefore, the present invention provides a first and second tuners including a first tuner, a second tuner, and a third tuner, and the first tuner and the second tuner are used for receiving different broadcast channels. When the reception status of the tuner of the receiver deteriorates, the broadcast channel received by the tuner with the deteriorated reception status is immediately changed to another broadcast channel that is broadcasting the same program as the broadcast channel being received and has a good reception status. It is an issue to switch.

  In order to achieve the above object, the present invention is different from the broadcast receiving apparatus including the first tuner, the second tuner, and the third tuner in that the first tuner and the second tuner are different. When receiving a broadcast channel, the third tuner is used to receive the first tuner alternative broadcast channel, which is a broadcast channel that is broadcasting the same content as the broadcast channel being received by the first tuner. An alternative broadcast channel check unit that checks the quality check and the reception quality of a second tuner alternative broadcast channel that is a broadcast channel that is broadcasting the same content as the broadcast channel that the second tuner is receiving; The first tuner substitute having a good reception quality checked by the substitute broadcast channel check unit at a first predetermined opportunity for a broadcast channel received by one tuner. A network for switching to a transmission channel and switching a broadcast channel received by the second tuner to the second tuner alternative broadcast channel having a good reception quality checked by the alternative broadcast channel check unit at a second predetermined opportunity And a follow execution unit. However, the alternative broadcast channel check unit, at least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good. The reception quality check of the first tuner alternative broadcast channel using the third tuner is performed at a frequency greater than the reception quality check of the second tuner alternative broadcast channel using the third tuner, and at least the When the reception quality level of the first tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the second tuner alternative broadcast channel using the third tuner is The reception quality check is performed at a frequency higher than the reception quality check of the first tuner alternative broadcast channel using the third tuner. .

  According to such a broadcast receiving apparatus, when the first tuner and the second tuner are receiving different broadcast channels, the first tuner is receiving data using the third tuner. Checking the reception quality of the first tuner alternative broadcast channel, which is a broadcast channel that broadcasts the same content as the broadcast channel, and a broadcast channel that is broadcasting the same content as the broadcast channel being received by the second tuner When checking the reception quality of a certain second tuner alternative broadcast channel, the reception quality of the alternative broadcast channel of the tuner having the lower reception quality of the first tuner and the second tuner is determined. Check more frequently. Therefore, it can be expected that the reception quality check of the alternative broadcast channel of the tuner having the lower reception quality is completed more promptly.

  On the other hand, when the reception quality of the other tuner is sufficiently good, the tuner of which the reception quality is not sufficiently good among the first tuner and the second tuner is more than the other tuner. However, there is a high probability that network follow-up will be required in the near future.

  Therefore, according to this receiving apparatus, it is expected that network follow-up can be performed immediately on a tuner whose reception quality has deteriorated, regardless of the reception quality of either the first tuner or the second tuner. it can.

  Here, in such a broadcast receiving apparatus, the alternative broadcast channel check unit checks the reception quality of the first tuner alternative broadcast channel using the third tuner, and the third tuner uses the third tuner. The reception quality check of the second tuner alternative broadcast channel is repeated alternately and at least the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficient. The time length of each time for checking the reception quality of the first tuner alternative broadcast channel is larger than the time length of each time for checking the reception quality of the second tuner alternative broadcast channel, At least the reception quality level of the first tuner is sufficiently good, and the reception quality level of the second tuner is sufficiently high. If not, the time length for each check of the reception quality of the second tuner alternative broadcast channel is set to be larger than the time length of the check times of the reception quality of the first tuner alternative broadcast channel. May be.

  Alternatively, in such a broadcast receiving apparatus, in the alternative broadcast channel check unit, the reception quality of the first tuner alternative broadcast channel using the third tuner is checked, and the first tuner using the third tuner is used. The reception quality of the two tuner alternative broadcast channels is alternately checked, and at least the reception quality level of the first tuner is not sufficiently good, and the reception quality level of the second tuner is sufficiently good. The ratio of the time length of each time the reception quality of the first tuner alternative broadcast channel is checked to the time length of the time of the reception quality check of the second tuner alternative broadcast channel is A ratio of the number of tuner alternative broadcast channels to the number of the second tuner alternative broadcast channels, and at least the first When the reception quality level of the tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the reception quality of the second tuner alternative broadcast channel is checked for each time length. The ratio of the number of times of the second tuner alternative broadcast channels to the number of the first tuner alternative broadcast channels is set to be larger than the ratio of the number of times of the second tuner alternative broadcast channels to the number of times of the first tuner alternative broadcast channels. It may be configured.

  By doing so, when the reception quality of one of the first tuner and the second tuner is not sufficiently good and the reception quality of the other tuner is sufficiently good, It becomes possible to ensure that all reception quality checks of the alternative broadcast channel of the tuner whose reception quality is not sufficiently good are completed before all reception quality checks of the alternative broadcast channel of the other tuner.

  Here, the broadcast receiving apparatus that alternately performs the reception quality check of the first tuner alternative broadcast channel and the reception quality check of the second tuner alternative broadcast channel as described above is performed in the alternative broadcast channel check unit. At least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good, the first reception of the first tuner alternative broadcast channel is performed. The quality check is performed before the first reception quality check of the second tuner alternative broadcast channel, and at least the reception quality level of the first tuner is sufficiently good, and the reception of the second tuner is sufficient. When the quality level is not sufficiently good, the reception quality check of the second tuner alternative broadcast channel is performed for the first time. It is preferably configured to perform before checking the reception quality of the tuner alternative broadcast channel.

  Further, each of the above broadcast receiving devices, in the alternative broadcast channel check unit, at least when both the reception quality of the first tuner and the reception quality of the second tuner are sufficiently good, The reception quality check of the first tuner alternative broadcast channel using the third tuner is performed at the same frequency as the reception quality check of the second tuner alternative broadcast channel using the third tuner. It is preferable to do.

  Further, the above-described broadcast receiving apparatus is configured such that, in the alternative broadcast channel check unit, at least when both the reception quality of the first tuner and the reception quality of the second tuner are not sufficiently good, The reception quality of the first tuner alternative broadcast channel using the third tuner is checked at the same frequency as the reception quality check of the second tuner alternative broadcast channel using the third tuner. Also good.

  Alternatively, in the alternative broadcast channel check unit, the above-described broadcast receiving apparatus is configured such that at least the levels of the reception quality of the first tuner and the reception quality of the second tuner are not sufficiently good. The reception quality check of the first tuner alternative broadcast channel using the third tuner is configured to be performed more frequently than the reception quality check of the second tuner alternative broadcast channel using the third tuner. May be.

  In order to achieve the above object, the present invention provides a broadcast receiving apparatus including a first tuner, a second tuner, and a third tuner, the first tuner and the second tuner. The first tuner alternative broadcast channel, which is a broadcast channel that uses the third tuner to broadcast the same content as the broadcast channel being received when the third tuner is receiving a different broadcast channel An alternative broadcast channel check unit that checks the reception quality of the second tuner alternative broadcast channel, which is a broadcast channel that is broadcasting the same content as the broadcast channel that the second tuner is receiving, The first tuner having a good reception quality checked by the alternative broadcast channel check unit at a first predetermined opportunity when the broadcast channel received by the first tuner is selected. Switch to the alternative broadcast channel, and switch the broadcast channel received by the second tuner to the second tuner alternative broadcast channel with good reception quality checked by the alternative broadcast channel check unit at a second predetermined opportunity. And a network follow execution unit. However, the alternative broadcast channel check unit checks the reception quality of the first tuner alternative broadcast channel using the third tuner and the reception quality of the second tuner alternative broadcast channel using the third tuner. And at least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good. The reception quality check of the first tuner alternative broadcast channel is performed before the first reception quality check of the second tuner alternative broadcast channel, and at least the reception quality level of the first tuner is sufficiently good. When the reception quality level of the second tuner is not sufficiently good, the reception quality of the first second tuner alternative broadcast channel The Ekku, performed before the reception quality check of the first tuner alternative broadcast channel for the first time.

  According to such a broadcast receiving apparatus, when the first tuner and the second tuner are receiving different broadcast channels, the first tuner is receiving data using the third tuner. Checking the reception quality of the first tuner alternative broadcast channel, which is a broadcast channel that broadcasts the same content as the broadcast channel, and a broadcast channel that is broadcasting the same content as the broadcast channel being received by the second tuner When alternately checking the reception quality of a certain second tuner alternative broadcast channel, the alternative broadcast channel of the tuner having the deteriorated reception quality of the first tuner and the second tuner is selected. The reception quality check is started before the reception quality check of the alternative broadcast channel of the other tuner. Therefore, it can be expected that the reception quality check of the alternative broadcast channel of the tuner whose reception quality is deteriorated is completed more quickly.

  On the other hand, when the reception quality of the other tuner is sufficiently good, the tuner of which the reception quality is not sufficiently good among the first tuner and the second tuner is more than the other tuner. However, there is a high probability that network follow-up will be required in the near future.

  Therefore, according to this receiving apparatus, it is expected that network follow-up can be performed immediately on a tuner whose reception quality has deteriorated, regardless of the reception quality of either the first tuner or the second tuner. it can.

Here, each of the above broadcast receiving apparatuses may be a broadcast receiving apparatus mounted on an automobile.
In addition, each of the above broadcast receiving apparatuses may be a broadcast receiving apparatus that receives an FM radio broadcast in which data is multiplexed into audio by RDS (Radio Data System), and in this case, the broadcast channel is: It becomes the frequency channel of the FM radio broadcast.

  As described above, according to the present invention, in the broadcast receiving apparatus that includes the first, second, and third tuners, and uses the first tuner and the second tuner for receiving different broadcast channels, When the reception status of the tuner and the second tuner is deteriorated, the broadcast channel received by the tuner with the deteriorated reception status is promptly received, and the reception status in which the same program as the broadcast channel being received is being broadcast is good. You can switch to another broadcast channel.

It is a block diagram which shows the structure of the radio broadcast receiving system which concerns on embodiment of this invention. It is a figure which shows the station list and AF list which concern on embodiment of this invention. It is a figure which shows the example of AF check operation | movement which concerns on embodiment of this invention. It is a flowchart which shows the AF check mode setting process which concerns on embodiment of this invention. It is a figure which shows the example of AF check operation | movement which concerns on embodiment of this invention. It is a figure which shows the example of AF check operation | movement which concerns on embodiment of this invention. It is a figure which shows the example of AF check operation | movement which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described by taking as an example an application to a radio broadcast receiving system that receives an FM radio broadcast in which a data signal is multiplexed with audio by RDS (Radio Data System).

  Here, the radio broadcast receiving system according to the present embodiment is a radio broadcast receiving system whose position varies, such as a radio broadcast receiving system mounted on an automobile.

FIG. 1 shows a configuration of a radio broadcast receiving system according to the present embodiment.
As shown in the figure, the radio broadcast receiving system includes a foreground tuner unit 1, a background tuner 2, an amplifier 3, a communication interface 4, a control unit 5, an operation unit 6, a display unit 7, and a memory 8. , An output selector 9, a speaker 100, and a rear audio output system 101.

The foreground tuner unit 1 includes a first tuner 11 and a second tuner 12.
The first tuner 11 of the foreground tuner unit 1 receives a frequency channel set as an FM reception channel and outputs an intermediate frequency signal. The front end 111, a synthesis unit 112, a selector 113, an FM demodulation unit 114, and an RDS decoder 115.

  Here, the front end 111 outputs the intermediate frequency signal to the selector 113 and the synthesis unit 112. The synthesizing unit 112 performs phase diversity for synthesizing an intermediate frequency signal input from the front end 111 and an intermediate frequency signal input from the front end 121 of the second tuner 12 described later, after adjusting the phase, and combining the intermediate frequency signals. The frequency signal is output to the selector 113.

  The selector 113 outputs one of the intermediate frequency signal input from the front end 111 and the intermediate frequency signal input from the synthesis unit 112 to the FM demodulation unit 114, and the FM demodulation unit 114 outputs the intermediate frequency signal from the selector 113. The intermediate frequency signal thus demodulated is FM demodulated, and the demodulated audio signal is output to the output selector 9.

  Further, the RDS decoder 115, when the signal demodulated by the FM demodulator 114 includes a data signal that is multiplexed and transmitted by an RDS (Radio Data System), transmits data from the data signal. Decode and send to control unit 5. Here, in the data obtained by decoding the data signal, a program identifier PI that is an identifier of a program (program) broadcasted from a frequency channel station set as an FM reception channel, or a frequency channel broadcasting the same program AF indicating the frequency of the current frequency is included.

  Further, the front end 111 notifies the control unit 5 of information related to the reception quality of the FM broadcast of the FM reception channel such as the reception electric field strength and the SN ratio of the FM reception channel, multipath noise, and adjacent noise as reception quality information. To do.

  Next, the second tuner 12 of the foreground tuner unit 1 includes a front end 121 that receives a frequency channel set as an FM reception channel and outputs an intermediate frequency signal, an FM demodulation unit 122, and an RDS decoder 123. .

  Here, the front end 121 outputs the intermediate frequency signal to the synthesis unit 112 and the FM demodulation unit 122 of the first tuner 11. The FM demodulator 122 then FM demodulates the intermediate frequency signal output from the front end 121 and outputs the demodulated audio signal to the output selector 9.

  The RDS decoder 123 decodes data from the data signal and sends the data to the control unit 5 when the signal demodulated by the FM demodulation unit 122 includes the above-described data signal. Further, the front end 121 notifies the control unit 5 of information related to the reception quality of the FM broadcast of the FM reception channel, such as the reception electric field strength and SN ratio of the FM reception channel, multipath noise, and adjacent noise, as reception quality information. To do.

  Next, the output selector 9 selectively selects one of the audio signal output from the FM demodulator 114 of the first tuner 11 and the audio signal output from the FM demodulator 122 of the second tuner 12 to the amplifier 3. The amplifier 3 amplifies the audio signal output from the output selector 9 and outputs it from the speaker 100.

  The output selector 9 selectively selects one of the audio signal output from the FM demodulator 114 of the first tuner 11 and the audio signal output from the FM demodulator 122 of the second tuner 12 to the communication interface 4. The communication interface 4 transmits the audio signal output from the output selector 9 to the rear audio output system 101, and the rear audio output system 101 transmits the transmitted audio signal to the user of the rear seat of the automobile. Output. More specifically, the rear audio output system 101 outputs, for example, an audio signal transmitted from the communication interface 4 to the headphone for the user on the rear seat.

  Next, the background tuner 2 receives a frequency channel set as an FM reception channel and outputs an intermediate frequency signal, an FM demodulator 32 that performs FM demodulation output from the front end 31, and an RDS decoder 33. It has.

  Here, if the data signal described above is included in the signal demodulated by the FM demodulator 32, the RDS decoder 33 decodes the data from the data signal and sends it to the controller 5.

  Further, the front end 31 notifies the control unit 5 of information related to the reception quality of the FM broadcast of the FM reception channel such as the reception electric field strength and the SN ratio of the FM reception channel, multipath noise, and adjacent noise as reception quality information. To do.

  In such a configuration, when the control unit 5 is instructed by the user via the operation unit 6 to output only from the speaker 100 of the frequency channel specified by the user, the front end of the first tuner 11 is used. 111 and the front end 121 of the second tuner 12 are set as frequency reception channels designated by the user as FM reception channels, and the intermediate frequency signal input from the synthesis unit 112 to the selector 113 of the first tuner 11 is set to the FM of the first tuner 11. The demodulator 114 outputs the signal, and the output selector 9 causes the amplifier 3 to output the audio signal input from the FM demodulator 114 of the first tuner 11.

  As a result, the reception of the frequency channel specified by the user by the phase diversity method using the first tuner 11 and the second tuner 12 and the output of the sound of the program received in the frequency channel from the speaker 100 are performed. become.

  In addition, when the control unit 5 is instructed by the user via the operation unit 6 to output only from the rear audio output system 101 of the frequency channel specified by the user, the control unit 5 and the front end 111 of the first tuner 11 The frequency channel designated by the user is set as the FM reception channel on the front end 121 of the two tuner 12, and the intermediate frequency signal input from the synthesis unit 112 to the selector 113 of the first tuner 11 is set as the FM demodulation unit 114 of the first tuner 11. And the output selector 9 outputs the audio signal input from the FM demodulator 114 of the first tuner 11 to the communication interface 4.

  As a result, reception of the frequency channel specified by the user by the phase diversity method using the first tuner 11 and the second tuner 12 and output of the sound of the program received on the frequency channel from the rear audio output system 101 are performed. Will be done.

  In addition, the control unit 5 receives an output from the speaker 100 of the first frequency channel designated by the user and a rear audio output system 101 of the second frequency channel designated by the user from the user via the operation unit 6. When output is instructed, the first frequency channel is set as the FM reception channel in the front end 111 of the first tuner 11, and the intermediate frequency input from the front end 111 of the first tuner 11 to the selector 113 of the first tuner 11. The signal is output to the FM demodulator 114 of the first tuner 11, the second frequency channel is set as the FM reception channel in the front end 121 of the second tuner 12, and the FM demodulator 114 of the first tuner 11 is set in the output selector 9. Is output to the amplifier 3, and the FM demodulator 12 of the second tuner 12 is output. It is output to the communication interface 4 the audio signal input from.

  As a result, the reception of the first frequency channel using the first tuner 11, the output of the sound of the program received through the frequency channel from the speaker 100, and the reception of the second frequency channel using the second tuner 12. Then, the audio of the program received through the frequency channel is output from the rear audio output system 101.

Next, FIG. 2 shows a station list, a first tuner AF list, and a second tuner AF list stored in the memory 8 in the present embodiment.
As shown in FIG. 2a, the station list is a list in which the frequency and the reception quality are registered for each frequency channel that can be currently received.
Also, as shown in FIG. 2b1, the first tuner AF list includes an alternative frequency that is the frequency for each frequency channel that broadcasts the same program as the frequency channel received by the first tuner 11, and its reception. It is a table in which quality is registered.

  Further, as shown in FIG. 2b2, the second tuner AF list includes an alternative frequency that is the frequency for each frequency channel that broadcasts the same program as the frequency channel received by the second tuner 12, and its reception. It is a table in which quality is registered.

  In such a configuration of the radio broadcast receiving system, the control unit 5 uses the background tuner 2 to investigate the frequency of the frequency channel that can be currently received and the reception quality, and perform a process of registering in the station list.

  That is, as shown in FIG. 3, the control unit 5 performs the following operation during the time slot TS assigned to the station search among the time slots TS assigned alternately to the AF check and the station search in advance.

  That is, the control unit 5 sequentially sets each frequency channel as the target channel, sets the target channel as the FM reception channel in the front end 31 of the background tuner 2, and performs the reception operation of the target channel. The reception quality of the target channel is calculated from the reception quality information notified from the front end 31. If the reception quality is at a level at which the broadcast can be normally received, the frequency of the target channel and the calculated reception quality are displayed in the station list. The operation registered in is performed during the time slot TS assigned to the station search.

  The control unit 5 displays a list of broadcast station frequencies registered in the station list on the display unit 7 in response to a user operation of the operation unit 6, and the frequency of the broadcast station selected by the user from the list. Is received as the frequency of the frequency channel received by the first tuner 11 or the second tuner 12.

  Next, the control unit 5 uses the background tuner 2 to investigate the frequency and reception quality of the frequency channel broadcasting the same program as the frequency channel received by the first tuner 11 and the second tuner 12. Then, a process of registering in the first tuner AF list and the second tuner AF list is performed.

  That is, when the control unit 5 receives the same frequency channel in the first tuner 11 and the second tuner 12, the control unit 5 first sends the AF sent from the RDS decoder 115 of the first tuner 11. The frequency of the frequency channel broadcasting the same program as the frequency channel received by the first tuner 11 is identified from the PI and registered in the first tuner AF list.

  Then, as shown in FIG. 3, the following first tuner AF check operation is performed during the time slot TS assigned to the AF check among the time slots TS assigned alternately to the AF check and the station search in advance. That is, if the start time of the first time slot TS assigned to the AF check is reached, the first tuner AF check operation is started, and if the end time of the first time slot TS assigned to the AF check is reached, the first time slot TS is started. 1 Tuner AF check operation is temporarily stopped. After that, when the start time of the time slot TS is reached, the first tuner AF check operation is resumed from where it was temporarily stopped, and when the end time of the time slot TS is reached, the first tuner AF. Repeatedly pausing the check operation.

  In the first tuner AF check operation, the control unit 5 first sets the frequency channel of the frequency registered at the top of the first tuner AF list as the target channel, and sets the target channel to the front end of the background tuner 2. 31 is set as the FM reception channel to perform the reception operation of the target channel. As a result, the reception quality of the target channel is calculated from the reception quality information notified from the front end 31 as described above. The reception quality is registered in the first tuner AF list as the reception quality of the frequency channel as the target channel. Thereafter, the target channel is updated to the frequency channel of the frequency registered in the first tuner AF list next to the target channel, and the target channel is set as the FM reception channel in the front end 31 of the background tuner 2. Then, the reception operation of the target channel is performed, and as a result, the reception quality of the target channel is calculated from the reception quality information notified from the front end 31 as described above, and the calculated reception quality of the target channel is set as the target channel. The process of registering in the first tuner AF list as the received quality of the frequency channel is repeated. However, when the target channel is a frequency channel of a frequency registered at the end of the first tuner AF list, the frequency channel of the frequency registered in the first tuner AF list next to the target channel, that is, The frequency channel to be the next target channel is the frequency channel of the frequency registered at the top of the first tuner AF list.

  On the other hand, when the first tuner 11 and the second tuner 12 receive different frequency channels, the control unit 5 uses the background tuner 2 to receive the first tuner 11 and the second tuner 12. The process of investigating the frequency and reception quality of the frequency channel broadcasting the same program as the current frequency channel and registering it in the first tuner AF list and the second tuner AF list is performed as follows.

That is, the control unit 5 first selects the frequency of the frequency channel that broadcasts the same program as the frequency channel received by the first tuner 11 from the AF or PI sent from the RDS decoder 115 of the first tuner 11. Identify and register in the first tuner AF list. The second tuner AF list specifies the frequency of the frequency channel broadcasting the same program as the frequency channel received by the second tuner 12 from the AF and PI sent from the RDS decoder 123 of the second tuner 12. Register with.

Then, the control unit 5 starts AF check mode setting processing.
FIG. 4 shows the procedure of the AF check mode setting process.
As shown in the figure, in this process, the control unit 5 first calculates the current reception quality of the first tuner 11 from the reception quality information notified from the front end 111 of the first tuner 11 (step 402). The current reception quality of the second tuner 12 is calculated from the reception quality information notified from the front end 121 of the second tuner 12 (step 404).

Then, it is determined whether the current reception quality of the first tuner 11 and the current reception quality of the second tuner 12 are both “high” (step 406).
Here, in this embodiment, a “high” level and a “low” level are provided as reception quality levels. The “high” level is a level at which the broadcast can be received sufficiently satisfactorily, and the “low” level is a level at which the broadcast can be received normally but the reception quality is not better than the “high” level. is there.

  If both the current reception quality of the first tuner 11 and the current reception quality level of the second tuner 12 are “high” (step 406), the equal mode is set as the AF check mode (step 408). The processing returns to step 402.

  On the other hand, if the current reception quality of the first tuner 11 and the current reception quality level of the second tuner 12 are not “high”, the current reception quality level of the first tuner 11 is “low”. Further, it is determined whether or not the current reception quality level of the second tuner 12 is “high” (step 410). If so, the first tuner priority mode is set as the AF check mode (step 412). Return to the processing from step 402.

  In addition, if the current reception quality level of the first tuner 11 is not “low” or the current reception quality level of the second tuner 12 is not “high” (step 410), the current current level of the first tuner 11 is determined. It is determined whether the reception quality level is “high” and the current reception quality level of the second tuner 12 is “low” (step 414). If so, the AF check mode is set as the AF check mode. The 2-tuner priority mode is set (step 416), and the process returns to step 402.

When the current reception quality level of the first tuner 11 is not “high” or the current reception quality level of the second tuner 12 is not “low” (step 414), that is, the current state of the first tuner 11 If the reception quality level of the second tuner 12 and the current reception quality level of the second tuner 12 are both “low”, the first tuner priority mode is set as the AF check mode (step 418), and the processing returns to step 402. . However, in step 418, the uniform mode may be set as the AF check mode. The AF check mode setting process performed by the control unit 5 has been described above.

The control unit 5 starts the AF check process when the first AF check mode is set by the AF check mode setting process.
Here, the AF check processing is performed in a form according to the set AF check mode.
That is, in the AF check process, when the equal mode is set as the AF check mode, the control unit 5 includes the time slots TS that are alternately allocated to the AF check and the station search in advance as shown in FIG. As shown in FIG. 5a, the time slots TS assigned to the AF check are alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check.

  Then, the first tuner AF check operation described above is performed during the time slot TS for the first tuner AF check, and the second tuner AF check operation is performed during the time slot TS for the second tuner AF check.

  That is, the control unit 5 starts the first tuner AF check operation when the start time of the first time slot TS for the first tuner AF check is reached, and the first time slot TS for the first tuner AF check. When the end time of is reached, the first tuner AF check operation is temporarily stopped. Thereafter, when the start time of the time slot TS for the first tuner AF check is reached, the first tuner AF check operation is resumed from where it was temporarily stopped, and the time slot for the first tuner AF check is resumed. When the TS end time is reached, the first tuner AF check operation is repeatedly paused.

  Similarly, the control unit 5 starts the second tuner AF check operation when the start time of the first time slot TS for the second tuner AF check is reached, and the first tuner AF check for the first tuner AF check is started. When the end time of the time slot TS is reached, the second tuner AF check operation is temporarily stopped. Thereafter, when the start time of the time slot TS for the second tuner AF check is reached, the second tuner AF check operation is resumed from where it was temporarily stopped, and the time slot for the second tuner AF check is resumed. When the TS end time is reached, the second tuner AF check operation is repeatedly paused.

  Here, in the second tuner AF check operation, the control unit 5 first sets the frequency channel of the frequency registered at the top of the second tuner AF list as the target channel, and sets the target channel to the front of the background tuner 2. The end 31 is set as the FM reception channel to perform the reception operation of the target channel, thereby calculating the reception quality of the target channel from the reception quality information notified from the front end 31 as described above, and the calculated target channel Is registered in the second tuner AF list as the reception quality of the frequency channel as the target channel. Thereafter, the target channel is updated to the frequency channel of the frequency registered in the second tuner AF list next to the target channel, and the target channel is set as the FM reception channel in the front end 31 of the background tuner 2. Then, the reception operation of the target channel is performed, and as a result, the reception quality of the target channel is calculated from the reception quality information notified from the front end 31 as described above, and the calculated reception quality of the target channel is set as the target channel. The process of registering in the second tuner AF list as the received quality of the frequency channel is repeated. However, when the target channel is a frequency channel having a frequency registered at the end of the second tuner AF list, the frequency channel having a frequency registered in the second tuner AF list next to the target channel, that is, The frequency channel to be the next target channel is the frequency channel of the frequency registered at the top of the second tuner AF list.

  Next, when the first tuner priority mode is set as the AF check mode in the AF check process, the control unit 5, as shown in FIG. 3, time allocated alternately to the AF check and the station search in advance. As shown in FIG. 5b, the time slots TS assigned to the AF check among the slots TS are further assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Here, the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check is the number of the time slots TS for the first tuner AF check that appear during a predetermined period. The ratio of the number of time slots TS for the second tuner AF check is n: m (where n> m). That is, the number of time slots TS for the first tuner AF check that appear during the predetermined period is made larger than the number of time slots TS for the second tuner AF check. Here, the values of n and m are determined in advance so that n> m. In FIG. 5b, n = 2 and m = 1, and the ratio of the number of time slots TS for the first tuner AF check and the number of time slots TS of the time slot TS for the second tuner AF check is 2: 1.

  In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the first tuner AF check is set first, and the time slot TS for the AF check is first. Assign to.

  The first tuner AF check operation described above is performed during the time slot TS for the first tuner AF check, and the second tuner AF check operation described above is performed during the time slot TS for the second tuner AF check. Do.

  Next, in the AF check process, when the second tuner priority mode is set as the AF check mode, the control unit 5 performs the time allocated alternately in advance to the AF check and the station search as shown in FIG. As shown in FIG. 5c, the time slots TS assigned to the AF check among the slots TS are further assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Here, the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check is the number of the time slots TS for the first tuner AF check that appear during a predetermined period. The second tuner AF check is performed so that the ratio of the number of time slots TS is m: n (where n> m). That is, the number of time slots TS for the second tuner AF check that appear during the predetermined period is made larger than the number of time slots TS for the first tuner AF check. Here, the values of n and m are determined in advance so that n> m. In FIG. 5c, n = 2 and m = 1, and the ratio of the number of time slots TS for the first tuner AF check and the number of time slots TS of the time slot TS for the second tuner AF check is 1: 2.

  In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the second tuner AF check is set first, and the time slot TS for the AF check is set first. Assign to.

  The first tuner AF check operation described above is performed during the time slot TS for the first tuner AF check, and the second tuner AF check operation described above is performed during the time slot TS for the second tuner AF check. Do.

  As described above, by assigning the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check in the first tuner priority mode and the second tuner priority mode, the first tuner 11 and the first tuner priority check mode are assigned. Of the two tuners 12, the AF check of the tuner having the lower reception quality is performed with a higher frequency. Therefore, it can be expected that the AF check of the tuner having the lower reception quality is completed more quickly.

  On the other hand, of the first tuner 11 and the second tuner 12, the tuner with the lower reception quality is more likely to have to follow the network in the near future than the other tuner unit. Therefore, even if the reception quality of either the first tuner 11 or the second tuner 12 is deteriorated by assigning the time slot TS as described above, the NF ( Network follow) operation can be expected. Details of the NF operation will be described later.

The processing for registering the frequency and the reception quality in the first tuner AF list and the second tuner AF list in the control unit 5 has been described above.
By the way, when the first tuner priority mode is set as the AF check mode in the AF check process, the control unit 5 sets the second tuner priority mode as the AF check mode as shown in FIG. 6a. If so, as shown in FIG. 6b, the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check may be allocated.

  That is, when the first tuner priority mode is set as the AF check mode, as shown in FIG. 6a, time slots TS are alternately allocated to the AF check and the station search. Further, the time slots TS assigned to the AF check are alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Further, the ratio of the time length of the time slot TS for the first tuner AF check and the time length of the time slot TS for the second tuner AF check is n: m (where n> m), that is, The time length of the first tuner AF check time slot TS is set so that the time length of the first tuner AF check time slot TS is longer than the time length of the second tuner AF check time slot TS; The time length of the time slot TS for the second tuner AF check is set. In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the first tuner AF check is first set to the time slot TS for the AF check. assign.

  Further, when the second tuner priority mode is set as the AF check mode, as shown in FIG. 6B, time slots TS are alternately allocated to the AF check and the station search. Further, the time slots TS assigned to the AF check are alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Further, the ratio of the time length of the first tuner AF check time slot TS to the time length of the second tuner AF check time slot TS is m: n (where n> m), that is, The time of the time slot TS for the first tuner AF check is set so that the time length of the time slot TS for the second tuner AF check is longer than the time length of the time slot TS for the first tuner AF check. The length and the time length of the time slot TS for the second tuner AF check are set. In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the second tuner AF check is first set to the time slot TS for the AF check. assign.

As shown in FIG. 6, even when the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check are assigned, the reception quality of the first tuner 11 and the second tuner 12 is assured. The AF check of the tuner with the inferior is performed more frequently. Therefore, as in the case shown in FIG. 5, regardless of whether the reception quality of the first tuner 11 or the second tuner 12 is deteriorated, the NF (network follow) operation for the tuner whose reception quality is deteriorated immediately. Can be expected.
Alternatively, in the AF check process, the control unit 5 performs the following when the first tuner priority mode is set as the AF check mode and when the second tuner priority mode is set as the AF check mode: Alternatively, the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check may be allocated.

  That is, when the first tuner priority mode is set as the AF check mode, as in FIG. 6a, time slots TS are alternately assigned to AF check and station search, and each time slot assigned to the AF check is assigned. TS is alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Further, the ratio of the time length T1 of the time slot TS for the first tuner AF check and the time length T2 of the time slot TS assigned to the time slot TS for the second tuner AF check is T1 / T2> k1 / k2. Set as follows. Here, k1 is the number of frequency channels (frequencies) registered in the first tuner AF list, and k2 is the number of frequency channels (frequencies) registered in the first tuner AF list. In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the first tuner AF check is first set to the time slot TS for the AF check. assign.

  When the second tuner priority mode is set as the AF check mode, as in FIG. 6b, time slots TS are alternately assigned to the AF check and the station search, and each time slot assigned to the AF check is assigned. TS is alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. The ratio of the time length T1 of the time slot TS for the first tuner AF check and the time length T2 of the time slot TS assigned to the time slot TS for the second tuner AF check is T2 / T1> k2 / k1. Set as follows. In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the second tuner AF check is first set to the time slot TS for the AF check. assign.

  In this way, by assigning the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check in the first tuner priority mode and the second tuner priority mode, the first tuner 11 and the second tuner A check of all reception qualities of the frequency channels registered in the AF list of the tuner with the lower reception quality of the tuner 12 is performed to check all receptions of the frequency channels registered in the AF list of the other tuner. It can be guaranteed that it will be completed before the quality check.

  Alternatively, when the first tuner priority mode is set as the AF check mode in the AF check process, the control unit 5 sets the second tuner priority mode as the AF check mode as shown in FIG. 7a. If so, as shown in FIG. 7b, a time slot TS for the first tuner AF check and a time slot TS for the second tuner AF check may be allocated.

  That is, when the first tuner priority mode is set as the AF check mode, as shown in FIG. 7a, time slots TS are alternately assigned to the AF check and the station search. Further, the time slots TS assigned to the AF check are alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Further, the time length of the time slot TS for the first tuner AF check is set once for all frequency channels (frequencies) registered in the first tuner AF list by the first tuner AF check operation described above. The time required to detect the reception quality and register it in the first tuner AF list is set as the time length of the time slot TS for the second tuner AF check, and all frequency channels registered in the second tuner AF list ( Frequency) is the time required to detect the reception quality once and register it in the second tuner AF list. In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the first tuner AF check is first set to the time slot TS for the AF check. assign.

  When the second tuner priority mode is set as the AF check mode, as shown in FIG. 7b, time slots TS are alternately assigned to the AF check and the station search. Further, the time slots TS assigned to the AF check are alternately assigned to the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check. Further, the time length of the time slot TS for the first tuner AF check is set once for all frequency channels (frequencies) registered in the first tuner AF list by the first tuner AF check operation described above. The time required to detect the reception quality and register it in the first tuner AF list is set as the time length of the time slot TS for the second tuner AF check. ) Is the time required to detect the reception quality once and register it in the second tuner AF list. In the allocation of the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check, the time slot TS for the second tuner AF check is first set to the time slot TS for the AF check. assign.

  As shown in FIG. 7, even if the time slot TS for the first tuner AF check and the time slot TS for the second tuner AF check are assigned in the first tuner priority mode and the second tuner priority mode, the first tuner is assigned. The frequency channel registered in the AF list of the other tuner is checked for all the reception qualities of the frequency channels registered in the AF list of the tuner having the inferior reception quality of 11 and the second tuner 12. Can be guaranteed to be completed before all reception quality checks.

Next, the control unit 5 performs the above-described NF operation as follows using the first tuner AF list and the second tuner AF list.
That is, when the control unit 5 receives different frequency channels between the first tuner 11 and the second tuner 12, the reception is calculated from the reception quality information notified from the front end 111 of the first tuner 11. When the quality deteriorates below a predetermined level, the FM reception channel of the front end 111 of the first tuner 11 is updated to the frequency channel having the best reception quality registered in the first tuner AF list, and the second tuner is updated. When the reception quality calculated from the reception quality information notified from the 12 front ends 121 is deteriorated from a predetermined level, the frequency channel having the best reception quality registered in the second tuner AF list is set to the second frequency channel. The FM reception channel of the front end 121 of the tuner 12 is updated.

Here, the predetermined level is, for example, a level obtained by adding a predetermined margin to a reception quality level at which the frequency channel cannot be normally received.
Further, when the first tuner 11 and the second tuner 12 receive the same frequency channel, the control unit 5 receives the reception calculated from the reception quality information notified from the front end 111 of the first tuner 11. When one of the quality and the reception quality calculated from the reception quality information notified from the front end 121 of the second tuner 12 is deteriorated from a predetermined level, the most registered in the first tuner AF list The FM reception channel of the front end 111 of the first tuner 11 and the FM reception channel of the front end 121 of the second tuner 12 are updated to a frequency channel having a frequency with good reception quality.

The embodiment of the present invention has been described above.
By the way, in the above, the embodiment of the present invention has been described by taking as an example the application to a radio broadcast receiving system that receives an FM radio broadcast in which a data signal is multiplexed with audio by RDS (Radio Data System). The present embodiment can be similarly applied to digital radio broadcasting that performs simultaneous broadcasting such as DAB and DAB +, and digital television broadcasting that performs other simultaneous broadcasting.

  DESCRIPTION OF SYMBOLS 1 ... Foreground tuner part, 2 ... Background tuner, 3 ... Amplifier, 4 ... Communication interface, 5 ... Control part, 6 ... Operation part, 7 ... Display part, 8 ... Memory, 9 ... Output selector, 11 ... 1st Tuner, 12 ... second tuner, 31 ... front end, 32 ... FM demodulator, 33 ... RDS decoder, 100 ... speaker, 101 ... rear audio output system, 111 ... front end, 112 ... synthesizer, 113 ... selector, 114 ... FM demodulator, 115 ... RDS decoder, 121 ... front end, 122 ... FM demodulator, 123 ... RDS decoder.

Claims (12)

A broadcast receiving apparatus including a first tuner, a second tuner, and a third tuner,
When the first tuner and the second tuner are receiving different broadcast channels, the first tuner uses the third tuner to broadcast the same content as the broadcast channel being received. The reception quality of the first tuner alternative broadcast channel that is the broadcast channel being received, and reception of the second tuner alternative broadcast channel that is the broadcast channel that is broadcasting the same content as the broadcast channel that the second tuner is receiving An alternative broadcast channel check section to check the quality,
The broadcast channel received by the first tuner is switched to the first tuner alternative broadcast channel with good reception quality checked by the alternative broadcast channel check unit at a first predetermined opportunity, and the second tuner A network follow execution unit that switches the broadcast channel received by the second tuner alternative broadcast channel with a good reception quality checked by the alternative broadcast channel check unit at a second predetermined opportunity,
The alternative broadcast channel check unit includes:
The first tuner using the third tuner at least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good. The reception quality check of the alternative broadcast channel is performed at a frequency greater than the reception quality check of the second tuner alternative broadcast channel using the third tuner,
At least when the reception quality level of the first tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the second tuner alternative using the third tuner A broadcast receiving apparatus characterized in that the reception quality of a broadcast channel is checked at a frequency greater than the reception quality check of the first tuner alternative broadcast channel using the third tuner. The broadcast receiving device according to claim 1,
The alternative broadcast channel check unit includes:
Checking reception quality of the first tuner alternative broadcast channel using the third tuner and checking reception quality of the second tuner alternative broadcast channel using the third tuner are alternately repeated.
At least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good, the reception quality of the first tuner alternative broadcast channel is checked. The time length of each time to perform the check is larger than the time length of each time to check the reception quality of the second tuner alternative broadcast channel,
At least when the reception quality level of the first tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the reception quality of the second tuner alternative broadcast channel is checked. A broadcast receiving apparatus characterized in that the time length of each time to be performed is larger than the time length of each time to check the reception quality of the first tuner alternative broadcast channel. The broadcast receiving device according to claim 1,
The alternative broadcast channel check unit includes:
Checking reception quality of the first tuner alternative broadcast channel using the third tuner and checking reception quality of the second tuner alternative broadcast channel using the third tuner are alternately repeated.
At least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good, the reception quality of the first tuner alternative broadcast channel is checked. The ratio of the time length of each time to the time length of each time of checking the reception quality of the second tuner alternative broadcast channel to the number of the second tuner alternative broadcast channels to the number of the first tuner alternative broadcast channels Larger than the ratio,
At least when the reception quality level of the first tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the reception quality of the second tuner alternative broadcast channel is checked. The ratio of the time length of each time to the time length of each time of checking the reception quality of the first tuner alternative broadcast channel is the ratio of the number of the second tuner alternative broadcast channels to the number of the first tuner alternative broadcast channels. A broadcast receiving apparatus characterized by being made larger. The broadcast receiving device according to claim 2 or 3,
The alternative broadcast channel check unit includes:
At least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good, the reception quality of the first tuner alternative broadcast channel for the first time is sufficient. Is performed before the first reception quality check of the second tuner alternative broadcast channel,
At least when the reception quality level of the first tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the reception quality of the first second tuner alternative broadcast channel is The broadcast receiving apparatus, wherein the check is performed before the first reception quality check of the first tuner alternative broadcast channel. The broadcast receiving device according to claim 1, 2, 3 or 4,
The alternative broadcast channel check unit includes:
At least the reception quality of the first tuner alternative broadcast channel using the third tuner when both the reception quality of the first tuner and the reception quality of the second tuner are sufficiently good. The broadcast receiving apparatus is characterized in that the check is performed at the same frequency as the reception quality check of the second tuner alternative broadcast channel using the third tuner. The broadcast receiving device according to claim 1, 2, 3, 4 or 5,
The alternative broadcast channel check unit includes:
The reception quality of the first tuner alternative broadcast channel using the third tuner is at least when both the reception quality of the first tuner and the reception quality of the second tuner are not sufficiently good. The broadcast receiving apparatus, wherein the check is performed at the same frequency as the reception quality check of the second tuner alternative broadcast channel using the third tuner. The broadcast receiving device according to claim 1, 2, 3, 4 or 5,
The alternative broadcast channel check unit includes:
The reception quality of the first tuner alternative broadcast channel using the third tuner is at least when both the reception quality of the first tuner and the reception quality of the second tuner are not sufficiently good. The broadcast receiving apparatus, wherein the check is performed at a frequency greater than the check of the reception quality of the second tuner alternative broadcast channel using the third tuner. A broadcast receiving apparatus including a first tuner, a second tuner, and a third tuner,
When the first tuner and the second tuner are receiving different broadcast channels, the first tuner uses the third tuner to broadcast the same content as the broadcast channel being received. The reception quality of the first tuner alternative broadcast channel that is the broadcast channel being received, and reception of the second tuner alternative broadcast channel that is the broadcast channel that is broadcasting the same content as the broadcast channel that the second tuner is receiving An alternative broadcast channel check section to check the quality,
The broadcast channel received by the first tuner is switched to the first tuner alternative broadcast channel with good reception quality checked by the alternative broadcast channel check unit at a first predetermined opportunity, and the second tuner A network follow execution unit that switches the broadcast channel received by the second tuner alternative broadcast channel with a good reception quality checked by the alternative broadcast channel check unit at a second predetermined opportunity,
The alternative broadcast channel check unit includes:
Checking reception quality of the first tuner alternative broadcast channel using the third tuner and checking reception quality of the second tuner alternative broadcast channel using the third tuner are alternately performed,
At least when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good, the reception quality of the first tuner alternative broadcast channel for the first time is sufficient. Is performed before the first reception quality check of the second tuner alternative broadcast channel,
At least when the reception quality level of the first tuner is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the reception quality of the first second tuner alternative broadcast channel is The broadcast receiving apparatus, wherein the check is performed before the first reception quality check of the first tuner alternative broadcast channel. The broadcast receiving device according to claim 1, 2, 3, 4, 5, 6, 7 or 8.
The broadcast receiving apparatus is a broadcast receiving apparatus mounted on an automobile. The broadcast receiving device according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9,
The broadcast receiving apparatus is a broadcast receiving apparatus that receives an FM radio broadcast in which data is multiplexed and voiced by RDS (Radio Data System),
The broadcast receiving apparatus, wherein the broadcast channel is a frequency channel of the FM radio broadcast. In a broadcast receiving apparatus including a first tuner, a second tuner, and a third tuner, when the first tuner and the second tuner are receiving different broadcast channels, Using the third tuner, checking the reception quality of the first tuner alternative broadcast channel, which is a broadcast channel that is broadcasting the same content as the broadcast channel being received by the first tuner, and receiving the second tuner An alternative broadcast channel check method for checking the reception quality of a second tuner alternative broadcast channel, which is a broadcast channel that broadcasts the same content as an internal broadcast channel,
In the broadcast receiving apparatus, a detection step of detecting a reception quality level of the first tuner and a reception quality level of the second tuner;
In the broadcast receiving apparatus, the third tuner is used when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good. The reception quality check of the first tuner alternative broadcast channel is performed at a frequency greater than the reception quality check of the second tuner alternative broadcast channel using the third tuner, and the reception quality of the first tuner is determined. When the level is sufficiently good and the reception quality level of the second tuner is not sufficiently good, the reception quality of the second tuner alternative broadcast channel using the third tuner is checked. And a check step performed at a frequency greater than the reception quality check of the first tuner alternative broadcast channel using the third tuner. Alternate broadcast channel check how. In a broadcast receiving apparatus including a first tuner, a second tuner, and a third tuner, when the first tuner and the second tuner are receiving different broadcast channels, Using the third tuner, checking the reception quality of the first tuner alternative broadcast channel, which is a broadcast channel that is broadcasting the same content as the broadcast channel being received by the first tuner, and receiving the second tuner An alternative broadcast channel check method for checking the reception quality of a second tuner alternative broadcast channel, which is a broadcast channel that broadcasts the same content as an internal broadcast channel,
In the broadcast receiving apparatus, a detection step of detecting a reception quality level of the first tuner and a reception quality level of the second tuner;
A check step of alternately performing reception quality check of the first tuner alternative broadcast channel using the third tuner and check of reception quality of the second tuner alternative broadcast channel using the third tuner; Have
In the checking step, when the reception quality level of the first tuner is not sufficiently good and the reception quality level of the second tuner is sufficiently good, the first tuner alternative broadcast channel for the first time Is checked before the first reception quality check of the second tuner alternative broadcast channel, the reception quality level of the first tuner is sufficiently good, and the reception of the second tuner is received. When the quality level is not sufficiently good, the first reception quality check of the second tuner alternative broadcast channel is performed before the first reception quality check of the first tuner alternative broadcast channel. Alternative broadcast channel check method .