JP2017017525A - Radio broadcast receiver and received broadcast service setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a "radio broadcast receiver and a received broadcast service setting method" switching broadcast services to receive and output so that voice quality of output voice is not deteriorated.SOLUTION: In the case that there is digital radio broadcast broadcasting voice of voice quality equal to or higher than a prescribed criterion in broadcast services broadcasting contents that can be received when reception quality of the broadcast service being received and outputted deteriorates, the broadcast service to be received and outputted is switched to the digital radio broadcast. In the case that there is no digital radio broadcast broadcasting voice of voice quality of the prescribed criterion or higher in receivable broadcast services broadcasting the content and there is FM broadcast, a broadcast service received and outputted is switched to the FM broadcast. The prescribed criterion represents standard voice quality of the FM broadcast.SELECTED DRAWING: Figure 1

Description

  The present invention mainly switches a reception target from a broadcast service being received to a broadcast service that is broadcasting the same content as the broadcast service in a radio broadcast receiving apparatus that receives radio broadcasts of a plurality of different broadcast standards. It is about technology.

  In a radio broadcast receiving apparatus that receives radio broadcasts of a plurality of different broadcast standards, a broadcast service that is broadcasting the same content as the broadcast service from the broadcast service being received (in relation to the broadcast service being received and the simulcast) As a technology for switching the reception target to a certain broadcast service), a radio broadcast receiving apparatus that receives DAB (Digital Audio Broadcasting) and FM broadcast has the same contents as the broadcast service from the broadcast service being received. There is known a technique for switching a reception target to a DAB broadcast service (service) or FM broadcast service (frequency channel) that broadcasts (for example, Patent Documents 1-5).

JP 2013-120967 A JP 2012-249277 A JP 2001-308732 A JP 2012-249277 A JP 2000-134119 A

  Audio that is broadcast with a DAB service that broadcasts digitized audio is less degraded by transmission than audio that is broadcast with an FM broadcast service that broadcasts analog audio. For this reason, when there is a DAB broadcast service that broadcasts the same content and an FM broadcast service, the DAB service is preferentially used.

  However, among DAB broadcasting services, there are broadcasting services that broadcast monaural audio, and broadcasting services that broadcast audio with lower audio quality than FM broadcasting audio, such as low bit rate encoded audio data. To do.

  When there is a DAB broadcast service that broadcasts audio with lower sound quality than FM broadcast audio, and an FM broadcast service that broadcasts the same content as the DAB broadcast service. On the other hand, if the DAB broadcast service is used preferentially, the quality of the audio output to the user will be lower than when the FM broadcast service is used.

  Therefore, an object of the present invention is to suppress deterioration in the quality of audio received and output to a user in a radio broadcast receiving apparatus that receives radio broadcasts of a plurality of different broadcast standards.

  In order to achieve the above object, the present invention provides a radio broadcast receiving apparatus that receives analog radio broadcast and digital radio broadcast. The radio broadcast receiving apparatus receives and outputs the analog broadcast broadcast service and the digital radio broadcast broadcast service. Other than the reception output target broadcast service, which receives a broadcast service set as a broadcast service, outputs a sound received by the broadcast service, and broadcasts the same content as the reception output target broadcast service The alternative analog broadcast service that is an analog radio broadcast broadcast service that can be received by the radio broadcast receiver, and the same content as the reception output target broadcast service, other than the reception output target broadcast service, An alternative digital data broadcasting service for digital radio broadcasting that can be received by the radio broadcasting receiving device Switching control for switching between a broadcast service and an alternative broadcast service detection unit that detects voice quality of audio broadcast by each of the alternative digital broadcast services, and a reception output target broadcast service set in the reception output unit at a predetermined opportunity Part. Here, when the alternative digital broadcast service includes an alternative digital broadcast service that broadcasts audio having a voice quality equal to or higher than a predetermined standard, the switching control unit has a voice quality higher than the predetermined standard. An alternative digital broadcast service that broadcasts audio with a voice quality equal to or higher than a predetermined standard among the alternative digital broadcast services by switching a reception output target broadcast service set in the reception output unit to an alternative digital broadcast service that broadcasts audio If the alternative analog broadcast service exists, the reception output target broadcast service set in the reception output unit is switched to the alternative analog broadcast service.

  Here, in such a radio broadcast receiving apparatus, in the switching control unit, only the alternative digital broadcast service that broadcasts audio with an audio quality less than a predetermined standard exists among the alternative digital broadcast services. When an analog broadcast service does not exist, the reception output target broadcast service set in the reception output unit may be switched to an alternative digital broadcast service that broadcasts audio with an audio quality less than the predetermined standard. .

  Further, such a radio broadcast receiving apparatus detects the reception quality of each alternative analog broadcast service and the reception quality of each alternative digital broadcast service in the alternative broadcast service detection unit, and In the alternative digital broadcasting service, if there is an alternative digital broadcasting service that broadcasts audio with a voice quality higher than a predetermined standard, the alternative digital broadcasting service that broadcasts voice with a voice quality higher than the predetermined standard The alternative digital broadcast service that has the best reception quality is switched to the reception output target broadcast service set in the reception output unit, and the alternative digital broadcast service broadcasts audio having a voice quality equal to or higher than a predetermined standard. If there is no broadcast service and the alternative analog broadcast service exists, the alternative Alternate analog broadcasting service reception quality is the best among the log broadcast service may be configured to switch the receiver output target broadcast service to be set in the receiver output.

  Further, in this case, in the switching control, only the alternative digital broadcast service that broadcasts audio with an audio quality less than a predetermined standard exists among the alternative digital broadcast services, and the alternative analog broadcast service does not exist. In this case, the reception output target broadcast service set in the reception output unit is switched to the alternative digital broadcast service having the best reception quality among the alternative digital broadcast services that broadcast the audio of the voice quality less than the predetermined standard. It may be.

  Here, in the radio broadcast receiving apparatus described above, the predetermined trigger may be the occurrence of deterioration of the reception quality of the reception output target broadcast service in the reception output unit to reception quality less than a predetermined level.

  In order to achieve the above object, the present invention provides a radio broadcast receiving apparatus that receives an analog radio broadcast and a digital radio broadcast. The radio broadcast reception apparatus receives a signal from the analog broadcast broadcast service and the digital radio broadcast broadcast service. The broadcast service set as the broadcast service to be output is received, the reception output unit that outputs the audio received by the broadcast service, and the broadcast service that is the target of reception and audio output is the broadcast service of interest. An alternative analog broadcast service that is an analog radio broadcast broadcast service that can be received by the radio broadcast receiver, and a radio broadcast that has the same content as the target broadcast service. An alternative digital broadcasting service that is a broadcasting service for digital radio broadcasting that can be received by a broadcast receiver. An alternative broadcast service detection unit that detects sound quality of audio broadcast by each of the alternative digital broadcast services, and a reception output target broadcast service setting unit that sets the output target broadcast service in the reception output unit It is a thing. Here, the reception output target broadcast service setting unit, when there is an alternative digital broadcast service that broadcasts audio with a voice quality of a predetermined standard or higher in the alternative digital broadcast service, An alternative digital broadcast service that broadcasts audio of a certain voice quality is set as a reception output target broadcast service in the reception output unit, and the alternative digital broadcast service is an alternative that broadcasts voice of a voice quality higher than a predetermined standard If there is no digital broadcast service and the alternative analog broadcast service exists, the alternative analog broadcast service is set as a reception output target broadcast service in the reception output unit.

  Here, in such a radio broadcast receiving apparatus, in the switching control unit, only the alternative digital broadcast service that broadcasts audio with an audio quality less than a predetermined standard exists among the alternative digital broadcast services. When there is no analog broadcast service, an alternative digital broadcast service that broadcasts audio with an audio quality less than the predetermined standard may be set in the reception output unit as a reception output target broadcast service.

Here, in the radio broadcast receiving apparatus described above, it is preferable that the predetermined reference represents a standard sound quality of sound broadcast by the analog radio broadcast.
In the above radio broadcast receiving apparatus, the predetermined reference may be a reference that the sound quality of monaural sound is lower than the predetermined reference.
In the radio broadcast receiving apparatus described above, the predetermined standard is that the audio quality of the audio broadcast as a compression-encoded audio stream having a bit rate less than the predetermined bit rate is less than the predetermined standard. It may be a standard that it is.

  In the above radio broadcast receiver, the predetermined standard is that the number of audio channels is greater than or equal to stereo, and the audio quality of the audio broadcast as a compressed and encoded audio stream having a bit rate equal to or higher than the predetermined bit rate is The standard may be that the voice quality is equal to or higher than the predetermined standard.

  Now, in the above radio broadcast receiving apparatus, the analog radio broadcast may be an FM broadcast in which data is multiplexed into audio by RDS (Radio Data System), and the digital radio broadcast is It may be DAB (Digital Audio Broadcasting).

Further, the radio broadcast receiving apparatus described above may be a radio broadcast receiving apparatus mounted on an automobile.
According to the radio broadcast receiving apparatus as described above, the broadcast service of the digital radio broadcast that broadcasts the sound with the sound quality exceeding the predetermined standard in the set of receivable broadcast services that broadcast the contents to be received, If analog radio broadcast service is included, digital radio broadcast service or analog radio broadcast service that broadcasts audio with higher quality than the specified standard, regardless of whether the reception quality is superior or inferior In addition, it is set to a broadcast service that receives and outputs preferentially over a broadcast service of a digital broadcast that broadcasts audio with an audio quality less than a predetermined standard included in the set.

  Therefore, it is possible to suppress deterioration of the quality of sound output to the user.

  As described above, according to the present invention, in a radio broadcast receiving apparatus that receives radio broadcasts of a plurality of different broadcast standards, it is possible to suppress deterioration in the quality of audio that is received and output to a user.

It is a block diagram which shows the structure of the radio broadcast receiver which concerns on embodiment of this invention. It is a figure which shows the service list, station list, and link table which concern on embodiment of this invention. It is a flowchart which shows the alternative broadcast switching process during FM broadcast reception output which concerns on embodiment of this invention. It is a flowchart which shows the alternative broadcast switching process during DAB reception output which concerns on embodiment of this invention. It is a flowchart which shows the receiving target broadcast setting process which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a configuration of a radio receiving apparatus according to the present embodiment.
As shown in the figure, the radio broadcast receiver is a radio broadcast receiver in which the position of the radio broadcast receiver varies, such as a radio receiver or a portable radio receiver mounted on an automobile.
As shown in the figure, the radio broadcast receiver includes two digital radio reception units 1, two analog radio reception units 2, a selector 3, an audio signal processing unit 4, a speaker 5, a control unit 6, and a display unit 7. , An operation unit 8 and a memory 9 are provided.

  Here, the digital radio receiving unit 1 is a receiving unit that receives a radio broadcast according to a DAB (Digital Audio Broadcasting) or DAB + broadcast standard, and includes a DAB front end 11 (DAB F / E), a DAB decoder 12, and an audio decoder 13. It has.

  The analog radio receiver 2 is a receiver that receives a radio broadcast according to the FM broadcast standard, and includes an FM front end (FM F / E) 21, an FM demodulator 22, and an RDS decoder 23.

  Now, in DAB, a plurality of services each corresponding to one audio broadcasting service can be broadcast on one frequency channel, and each service has a service identifier SID (Service Identifier). A collection of services broadcast on the same frequency channel is called an ensemble.

The digital radio receiver 1 performs the following service reception operation as the broadcast service reception operation.
That is, in the service reception operation, the DAB front end 11 of the digital radio receiver 1 receives the DAB of the frequency channel set as the DAB reception channel, and sends the received data to the DAB decoder 12. The DAB decoder 12 sends the compressed and encoded audio data stream received by the service set as the DAB reception service from the received data sent from the DAB front end 11 to the audio decoder 13 and uses the DAB reception channel. The service identifier SID and service linking information of each broadcast service are sent to the control unit 6. Then, the audio decoder 13 decodes the audio data stream sent from the DAB decoder 12 and outputs the decoded audio data to the selector 3. Further, the DAB front end 11 and the DAB decoder 12 notify the control unit 6 of the information related to the reception quality of the DAB service, such as the reception field strength of the DAB reception channel, the SN ratio, and the error rate of the reception data, as reception quality information. To do. The audio decoder 13 also transmits audio data audio such as the bit rate of the compression-coded audio data stream sent from the DAB decoder 12, the number of audio channels such as stereo / mono audio represented by the audio data stream, and the sampling frequency. Information related to quality is notified to the control unit 6 as voice quality information.

  In the service reception operation of the digital radio reception unit 1 described above, the service set as the DAB reception service among the services broadcasting on the DAB reception channel corresponds to the service targeted for the reception operation.

Next, in FM broadcasting, broadcasting performed on one frequency channel corresponds to one audio broadcasting service.
The analog radio reception unit 2 performs the following FM broadcast frequency channel reception operation as a broadcast service reception operation.
That is, in the frequency channel reception operation, the FM front end 21 of the analog radio reception unit 2 receives the frequency channel set as the FM reception channel and sends the received signal to the FM demodulation unit 22. The FM demodulation unit 22 receives the frequency channel. The audio signal is demodulated from the signal, and audio data representing the demodulated audio signal is sent to the selector 3. In addition, when the received signal includes a data signal that is multiplexed with an audio signal by RDS (Radio Data System) and transmitted, the FM demodulator 22 sends the data signal to the RDS decoder 23, and the RDS decoder 23 decodes the data from the data signal and sends it to the controller 6. Here, the data sent from the RDS decoder 23 to the control unit 6 includes PI (Program Identification), which is an identifier of a program (program) broadcasted from the frequency channel set as the FM reception channel, and AF (Alternative Frequencies). Etc. are included. Further, the FM front end 21 notifies the control unit 6 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, as reception quality information.

  In the above-described FM radio frequency channel reception operation of the analog radio receiver 2, the frequency channel that is broadcasting on the FM reception channel corresponds to the frequency channel that is the target of the reception operation.

  Here, the control unit 6 calculates the reception quality of the DAB service for which the digital analog radio reception unit 1 is performing the reception operation from the reception quality information of the service notified from the digital radio reception unit 1, and the analog radio From the reception quality information notified from the reception unit 2, the reception quality of the frequency channel of the FM broadcast on which the analog radio reception unit 2 performs the reception operation is calculated.

  Now, the content broadcast by the DAB service and the FM broadcast frequency channel that broadcasts the PI program that matches the SID of the service broadcast the program (program) with the same content.

  The AF received from the frequency channel of FM broadcast indicates the frequency of the frequency channel broadcasting the same program as that frequency channel. Also, the service linking information broadcast on DAB indicates information on the DAB service broadcasting the same program and the frequency channel of FM broadcasting. In addition, DAB service information that broadcasts the same program as the frequency channel of FM broadcasting may be included as ODA information.

  Therefore, the control unit 6 determines for each program based on the SID of the DAB service, the PI of the frequency channel of the FM broadcast, the AF received by the FM broadcast, the service linking information received by the DAB, and the ODA information received by the FM broadcast. , DAB services that broadcast programs of the same content, FM channel frequency channels can be known.

  In such a configuration of the radio receiver, if the control unit 6 receives a request for receiving a specific DAB service from the user via the operation unit 8 with an appropriate user interface using the display unit 7. For example, the service requested to be received is set as a reception target broadcast that is a broadcast service that outputs reception and sound, and reception of the reception target broadcast and output of sound are started.

  In addition, the control unit 6 uses a suitable user interface using the display unit 7, and if a request for reception of a specific FM broadcast frequency channel is generated from the user via the operation unit 8, the frequency requested to be received The channel is set to the reception target broadcast, and reception of the reception target broadcast and audio output are started.

Here, the reception target broadcast is set as follows.
That is, when the DAB service is set as a reception target broadcast, the control unit 6 sets any one of the digital radio reception units 1 as an active reception unit and receives the frequency channel of the ensemble including the service by DAB reception. The channel is set in the DAB front end 11 of the active receiving unit, and the service is set in the DAB decoder 12 as the DAB receiving service, whereby the reception operation of the service is performed on the digital radio receiving unit 1 set as the active receiving unit. Make it. Further, the control unit 6 causes the selector 3 to output the audio data input from the audio decoder 13 of the active receiving unit to the audio signal processing unit 4. The audio signal processing unit 4 adjusts frequency characteristics, digital / analog conversion, and amplification of audio data input via the selector 3 and outputs the result from the speaker.

As a result, the DAB service requested by the user for reception is set as the reception target broadcast, and the sound broadcast on the reception target broadcast is output from the speaker 5 to the user.
Further, when setting the frequency channel of FM broadcast as the reception target broadcast, the control unit 6 sets any one of the analog radio reception units 2 as the active reception unit, and sets the frequency of the frequency channel of the FM broadcast to FM. By setting the reception channel in the FM front end 21 of the active reception unit, the analog radio reception unit 2 set in the active reception unit performs the reception operation of the frequency channel. In addition, the control unit 6 causes the selector 3 to output the audio data input from the FM demodulation unit 22 of the active reception unit to the audio signal processing unit 4. Then, the audio signal processing unit 4 adjusts frequency characteristics, digital / analog conversion, and amplification of the audio data input via the selector 3 and outputs the result from the speaker.

Here, as a result, the FM broadcast requested by the user for reception is set as the reception target broadcast, and the sound broadcast on the reception target broadcast is output from the speaker 5 to the user.
Next, a service list, a station list, and a link table stored in the memory 9 in the present embodiment will be described.
As shown in FIG. 2a, the service list includes a SID table provided for each SID value, and a corresponding SID value is registered in each SID table. In addition, the SID table includes an entry provided for each of the services that can be currently received among the services of the corresponding SID, and each entry is a frequency at which an ensemble including the corresponding service is broadcast. The channel frequency, the reception quality of the corresponding service, and the voice quality information indicating the voice quality of the audio broadcast by the corresponding service are registered. Here, as the audio quality information, the bit rate of the compression-coded audio data stream broadcast by the corresponding service, the number of audio channels such as audio stereo / monaural represented by the audio data stream, the sampling frequency, etc. are registered. To do.

  Next, as shown in FIG. 2B, the station list includes a PI table provided for each PI value, and the corresponding PI value is registered in each PI table. In addition, the PI table includes entries provided corresponding to each of the frequency channels that can be currently received, among the frequency channels of FM broadcasting that broadcasts the program of the corresponding PI, and the frequency corresponding to each entry. The channel frequency and reception quality are registered.

  Next, as shown in FIG. 2c, the SID of the DAB service broadcasting the same program and the PI of the frequency channel of FM broadcasting are registered in the link table in association with each other. Here, in the following, a PI associated with a certain SID in the link table is referred to as a PI linked to that SID, and a SID associated with a certain PI in the link table is defined as that PI. It will be described as a linked SID.

  In such a configuration, the control unit 6 checks the reception quality of each receivable DAB service using the digital radio reception unit 1 not set as the active reception unit, and updates the service list. Repeat the process. Further, the control unit 6 uses the analog radio reception unit 2 not set as the active reception unit to check the reception quality of each receivable FM broadcast frequency channel, and repeatedly performs a process of updating the station list. .

  Here, the process of checking the reception quality of each DAB service that can be received and updating the service list is performed by sequentially setting each frequency at which DAB can be performed as the target frequency, and for each target frequency, the following reception quality check process It performs by doing.

  That is, in the reception quality check process, one of the digital radio receivers 1 not set as the active receiver is set as the background DAB receiver, the target frequency is set as the DAB receive channel in the background DAB receiver As a result, the reception quality of the target frequency is calculated from the reception quality information notified from the DAB front end 11 and the DAB decoder 12 of the background DAB reception unit. If the calculated reception quality is not better than a predetermined threshold, an entry in the SID table in which the target frequency is registered as a frequency is searched, and the entry is deleted. Here, the threshold value is a value that can guarantee that the audio broadcast by the DAB service of the frequency channel can be normally received and output if the reception quality is a frequency channel better than the threshold value. Set.

  On the other hand, if the calculated reception quality is better than the predetermined threshold, the SID of each service broadcast on the frequency channel of the target frequency is acquired from the DAB decoder 12, and the acquired service of each SID is sequentially applied to the target service. Then, the following service check process is performed.

  That is, in the service check process, the target service is set as the DAB reception service in the DAB decoder 12 and the reception operation of the target service is performed, thereby obtaining the voice quality information notified from the audio decoder 13 as described above. In the SID table where the SID of the target service is registered, the target frequency is registered as a frequency, the received quality of the calculated target frequency is registered as the reception quality, and the acquired voice quality information is registered as the voice quality information. to add. However, if there is an entry in which the target frequency is already registered as a frequency in the SID table in which the SID of the target service is registered, the reception quality and voice quality information of the entry in which the frequency is registered, Update the calculated reception quality and the acquired voice quality information.

  However, during the period when the DAB service is the reception target broadcast, the reception quality check of the above service broadcasts the same program as the reception target broadcast obtained from the service linking information received together with the reception target broadcast. Only for services that are broadcasting the same program as the frequency channel that is the target broadcast during the period when the frequency channel of the FM broadcast is the target broadcast. Good. Here, the service that is broadcasting the same program as the reception target broadcast can be obtained from the link table described above, or received using the ODA information received together with the reception target broadcast or the background DAB reception unit. It can be obtained from service linking information including frequency channel information of the target FM broadcast.

  Next, the process of checking the reception quality of each frequency channel of FM broadcast that can be received and updating the station list is performed by sequentially setting each frequency at which FM broadcast can be performed as the target frequency. It is executed by performing quality check processing.

  That is, in the reception quality check process, one of the analog radio reception units 2 not set as the active reception unit is set as the background FM reception unit, and the target frequency is set as the FM reception channel in the background FM reception unit. As a result, the reception quality of the target frequency is calculated from the reception quality information notified from the FM front end 21 of the background FM reception unit. If the quality is better than a predetermined threshold, the PI is acquired from the RDS decoder 23 of the background FM receiver, the target frequency is registered as a frequency in the PI table in which the acquired PI is registered, and the calculated reception Add an entry that registers the quality as the reception quality. However, if there is an entry in which the target frequency is already registered as a frequency in the PI table in which the acquired PI is registered, the reception quality of the entry in which the target frequency is registered is updated with the received quality. To do. If the calculated reception quality is not better than a predetermined threshold value, an entry in the PI table in which the target frequency is registered as a frequency is searched and the entry is deleted. Here, the threshold value is set to a value that can guarantee that the audio broadcast on the frequency channel can be normally received and output if the frequency channel has a good reception quality.

  However, the above FM channel frequency channel reception quality check is the same as the target broadcast service that is obtained from the service linking information received with the target broadcast while the DAB service is the target broadcast. FM broadcast that broadcasts only the frequency channel of the FM broadcast that is broadcasting the program, and broadcasts the same program as the frequency channel that is the reception target broadcast during the period when the frequency channel of the FM broadcast is the reception target broadcast Alternatively, it may be performed only on the frequency channel. Here, the frequency channel of the FM broadcast that broadcasts the same program as the frequency channel of the FM broadcast that is the reception target broadcast can be obtained by AF received from the frequency channel that is the reception target broadcast.

Next, the control unit 6 repeatedly performs a link table update process for updating the link table using the active reception unit, the background DAB reception unit, and the background FM reception unit.
That is, the control unit obtains the SDI and service linking information of the receivable DAB service when checking the reception quality of the receivable DAB service, and the receivable FM broadcast frequency channel. When checking the reception quality, the PI, AF, and ODA information of the frequency channel is acquired from the frequency channel of the FM broadcast that can be received. And the acquired SDI, service linking information, PI, AF, ODA information and SI and service linking information (when the reception target broadcast is a DAB service) received from the reception target broadcast at the current receiving unit, or PI and Analyzing AF and ODA information (when the target broadcast is an FM broadcast frequency channel) and calculating the correspondence between the SID of the DAB service broadcasting the same program and the PI of the FM broadcast frequency channel Then, according to the calculated correspondence, the link table is updated so that the SID and PI are associated and registered.

  For simplicity, the link table assumes that the SID of the DAB service corresponds to the frequency channel of the FM broadcast of the PI with the same value as the SID. The PI may be registered in association with it.

  Next, the control unit 6 monitors the reception quality of the reception target broadcast of the active reception unit during the period of reception of the reception target broadcast using the current reception unit and output to the speaker 5, and the reception target broadcast If the reception quality is lower than a predetermined determination level, a process of switching the reception target broadcast to another broadcast broadcasting the same program as the reception target broadcast is performed.

  That is, if the reception quality of the reception target broadcast falls below the judgment level during the period when the DAB service is the reception target broadcast and the DAB service is received and output to the speaker 5 If the reception quality of the target broadcast is lower than the judgment level during the period when the broadcast switching process is performed and the frequency channel of the FM broadcast is received and output to the speaker 5, the alternative broadcast is switched during the FM broadcast reception output. Process. Here, the determination level is a reception quality level at which it is predicted that normal reception and audio output of the reception target broadcast cannot be performed in the near future. More specifically, the determination level is, for example, a level obtained by adding a predetermined margin to a reception quality level at which normal broadcast reception and audio output cannot be performed.

Hereinafter, such an alternative broadcast switching process during DAB reception output and an alternative broadcast switching process during FM broadcast reception output will be described.
First, an alternative broadcast switching process during DAB reception output performed when the reception quality of the reception target broadcast falls below the determination level during the period in which the DAB service is received and output to the speaker 5 will be described.

  As shown in FIG. 3, in the alternative broadcast switching process during DAB reception output, the control unit 6 sets the audio quality to a predetermined standard in the SID table in which the SID of the DAB service being received and output as the reception target broadcast is registered. It is checked whether or not there is an entry for a service other than the service that is the reception target broadcast as described above (step 302). That is, in step 302, an entry in which a frequency other than the frequency of the frequency channel being received in the active receiving unit is registered in the SID table in which the SID of the DAB service being received and output is registered, It is checked whether or not there is an entry whose voice quality indicated by the voice quality information registered in is better than a predetermined standard.

  Here, as the predetermined standard, the sound quality of standard FM broadcast is used, and if the sound quality indicated by the sound quality information is higher than the sound quality of standard FM broadcast, the sound quality information is The indicated voice quality is determined to be better than a predetermined standard.

  More specifically, for example, when the audio quality indicated by the audio quality information is stereo (2Ch) or higher and the bit rate is 96 kbps or higher, the audio quality indicated by the audio quality information is It is determined that it is better than a predetermined standard. However, in addition to the number of audio channels and bit rate, and other factors related to audio quality such as sampling frequency, the audio quality indicated by the audio quality information is the standard FM broadcast audio quality (predetermined It may be determined whether it is equal to or greater than (reference).

  If it is determined in step 302 that there is an entry, the reception target broadcast is switched to the service corresponding to the entry having the best registered reception quality among the existing entries, and the reception target broadcast after switching is switched. Reception and output are started (step 304), and the process is terminated.

  That is, in step 304, the frequency channel of the frequency registered in the entry with the best registered reception quality among the existing entries is set as the DAB reception channel in the DAB front end 11 of the active reception unit, and the reception target By setting a service with the same SID as the DAB service being received and output as a broadcast to the DAB decoder 12 of the current receiver as the DAB reception service, the reception target broadcast is switched to the service corresponding to the entry with the best reception quality. , Start receiving and outputting the target broadcast after switching.

  On the other hand, if it is determined in step 302 that no entry exists, a frequency channel entry exists in the PI table in which the PI linked to the SID of the DAB service being received and output as the reception target broadcast is registered. It is checked whether or not (step 306). Note that the PI linked to the SID of the DAB service being received and output as the reception target broadcast is the PI registered in the link table in association with the SID of the DAB service being received and output as described above. The frequency channel of the FM broadcast of the PI broadcasts the same program as the DAB service that is the reception target broadcast.

  If the entry exists (step 306), the reception target broadcast is switched to the frequency channel of the FM broadcast corresponding to the entry having the best registered reception quality among the existing entries, and the reception target after switching is set. Broadcast reception and output are started (step 308), and the process is terminated.

  That is, in step 308, the active receiving unit is switched to the analog radio receiving unit 2 that is not used as the background FM receiving unit, and the FM front end 21 of the analog radio receiving unit 2 serving as the active receiving unit is switched to The frequency registered in the entry having the best reception quality is set as the FM reception channel, and the audio data input from the FM demodulation unit 22 of the analog radio reception unit 2 serving as the active reception unit to the selector 3 is an audio signal processing unit. 4, the reception target broadcast is switched to the frequency channel corresponding to the entry having the best reception quality, and reception and output of the reception target broadcast after switching are started.

  Next, when it is determined in step 306 that there is no entry, the SID table in which the SID of the DAB service being received and output as the reception target broadcast is registered in the SID table in which the active receiving unit is receiving the frequency channel being received. It is checked whether there is an entry in which a frequency other than the frequency is registered (step 310).

  If an entry exists (step 310), the reception target broadcast is switched to the DAB service corresponding to the entry having the best registered reception quality among the existing entries, and the reception target broadcast after switching is changed. Reception and output are started (step 312).

On the other hand, if there is no entry (step 310), the process is terminated as it is.
Heretofore, the alternative broadcast switching process during DAB service reception output performed by the control unit 6 has been described.
Hereinafter, the reception quality of the reception target broadcast is lower than the determination level during the period in which the control unit 6 receives the FM broadcast frequency channel as the reception target broadcast and receives the FM broadcast frequency channel and outputs to the speaker 5. An alternative broadcast switching process during FM broadcast reception output that is performed when this is done will be described.

  As shown in FIG. 4, in the FM broadcast reception output alternative broadcast switching process, the control unit 6 determines that the SID linked to the PI of the frequency channel of the FM broadcast being received and output by the active reception unit as the reception target broadcast. It is checked whether or not there is an entry of a service whose voice quality is better than the predetermined standard in the registered SID table (step 402).

  That is, in Step 402, the voice quality indicated by the voice quality information is recorded in the SID table in which the SID linked to the PI of the frequency channel of the FM broadcast being received and output as the reception target broadcast is registered in the SID table. Check whether there is an entry that is better than a predetermined standard. Note that the SID linked to the frequency channel PI of the FM broadcast being received and output as the reception target broadcast is registered in the link table in association with the PI of the frequency channel being received and output as described above. The SID's DAB service broadcasts the same program as the frequency channel of the FM broadcast that is the target broadcast.

  If it is determined in step 402 that an entry exists, the reception target broadcast is switched to the DAB service corresponding to the entry having the best registered reception quality among the existing entries, and the reception target after switching is set. Broadcast reception and output are started (step 404), and the process is terminated.

  That is, in step 404, the active receiving unit is switched to the digital radio receiving unit 1 that is not used as the background DAB receiving unit, and the DAB front end 11 of the digital radio receiving unit 1 serving as the active receiving unit is switched to Of the existing entries, the frequency channel of the frequency registered in the entry with the best registered reception quality is set as the DAB reception channel, and the frequency of the FM broadcast being received and output is set in the DAB decoder 12 of the active receiving unit. The SID service linked to the channel PI is set as the DAB reception service, and the audio data input from the audio decoder 13 of the digital radio receiver 1 serving as the active receiver to the selector 3 is input to the audio signal processor 4. By making it output, it is possible to broadcast to the service corresponding to the entry with the best reception quality. And start receiving and outputting the target broadcast after switching.

  On the other hand, if it is determined in step 402 that there is no entry, the frequency channel being received in the active receiving unit is registered in the PI table in which the PI of the frequency channel of the FM broadcast being received and output as the reception target broadcast is registered. It is checked whether or not there is an entry in which a frequency other than this frequency is registered (step 406).

  If there is an entry (step 406), the reception target broadcast is switched to the frequency channel corresponding to the entry having the best registered reception quality among the existing entries, and reception of the reception target broadcast after switching is received. , Output is started (step 408), and the process is terminated.

  That is, in step 408, the frequency registered in the entry with the best reception quality is set as the FM reception channel in the FM front end 21 of the active reception unit, so that the frequency channel corresponding to the entry with the best reception quality is obtained. The reception target broadcast is switched, and reception and output of the reception target broadcast after switching are started.

  Next, if it is determined in step 406 that there is no entry, the entry is entered in the SID table in which the SID linked to the PI of the frequency channel of the FM broadcast being received and output is registered as the reception target broadcast. It is checked whether it exists (step 410).

  If the entry exists (step 410), the reception target broadcast is switched to the service corresponding to the entry having the best registered reception quality among the existing entries, and the reception target broadcast after the switching is received, Output is started (step 412).

On the other hand, if there is no entry (step 410), the process is terminated as it is.
Heretofore, the alternative broadcast switching process during FM broadcast reception output performed by the control unit 6 has been described.
The embodiment of the present invention has been described above.
As described above, according to the present embodiment, when the reception quality of the broadcast service being received and output is deteriorated, among the receivable broadcast services that are broadcasting the same content, the audio quality that is higher than a predetermined standard If there is a DAB service that broadcasts the audio, the broadcast service to be received and output to that DAB service is switched. In addition, if there is no DAB service that broadcasts audio with a quality higher than the predetermined standard among the receivable broadcast services that broadcast the same content, and there is an FM broadcast frequency channel, the FM Switch the broadcast service to be received and output to the broadcast frequency channel. If there is only a DAB service that broadcasts audio with a quality lower than the predetermined standard among the receivable broadcast services that broadcast the same content, the broadcast service that receives and outputs to that DAB service Switch. Further, the predetermined standard represents the sound quality of standard FM broadcasting.

  In other words, the radio broadcast receiving apparatus according to the present embodiment is capable of receiving a DAB service that broadcasts voice quality that is lower than the FM broadcast voice quality. When a DAB service that broadcasts audio or an FM broadcast frequency channel is receivable, the service / FM broadcast frequency channel that broadcasts audio with a voice quality equal to or higher than the voice quality of the FM broadcast is preferentially received and output.

  Therefore, according to the present embodiment, in the radio broadcast receiving apparatus that receives FM broadcast and DAB, the switching from the broadcast service being received to the broadcast service that is broadcasting the same content as the broadcast service is received. However, the quality of the sound output to the user can be reduced as much as possible.

  By the way, the technology for setting a broadcast service for receiving and outputting so that the quality of the sound received and outputted to the user according to the present embodiment is not deteriorated as much as possible accepts designation of a broadcast service as a new reception target broadcast from the user. When starting reception and audio output of the specified broadcast service, or when restarting reception and audio output of the broadcast service received during the previous operation when the radio broadcast receiver is started The present invention can also be applied to use for setting a broadcast to be received when reception of a new program (SID, PI) and audio output are started.

  That is, in this case, the broadcast service whose output is started or restarted is designated broadcast service, and the receivable broadcast service broadcasting the same content as the designated broadcast service has an audio quality higher than a predetermined standard. If there is a DAB service that broadcasts, set the DAB service as the target broadcast. In addition, if there is no DAB service that broadcasts audio with a quality higher than the predetermined standard among the receivable broadcast services that broadcast the same content, and there is an FM broadcast frequency channel, the FM A broadcast frequency channel is set as a broadcast to be received. In addition, if there is only a DAB service that broadcasts audio with an audio quality less than the prescribed standard among the receivable broadcast services that are broadcasting the same content, that DAB service is designated as the reception target broadcast. Set.

Here, more specifically, such application can be realized by performing the reception target broadcast setting process shown in FIG. 5 when reception of a new program (SID, PI) is started.
As shown in the figure, in the reception target broadcast setting process, the control unit 6 checks whether or not the designated broadcast service, which is a broadcast service for starting or restarting output, is an FM broadcast frequency channel (step 502), and determines the frequency of the FM broadcast. If it is a channel, the PI of the frequency channel that is the designated broadcast service is set as the target ID (step 504). On the other hand, if the designated broadcast service is not an FM broadcast frequency channel, that is, if the designated broadcast service is a DAB service, the SID of the designated DAB service is set as the target ID (step 506).

  And the voice quality is the predetermined value in the SID table in which the target ID is the same value (when the target ID is SID) or the SID linked with the target ID (when the target ID is PI) is registered. It is checked whether or not there is an entry with a service better than the standard (step 508).

  If it is determined in step 508 that an entry exists, the DAB service corresponding to the entry with the best registered reception quality among the existing entries is set as the broadcast to be received, as described above. Reception and output of the reception target broadcast set in (Step 510) is started, and the process is terminated.

  On the other hand, if it is determined in step 508 that there is no entry, the target ID and the value are the same (when the target ID is PI), or the PI linked to the target ID (when the target ID is SID). It is checked whether or not there is a frequency channel entry in the PI table in which is registered (step 512).

  If there is an entry (step 512), the FM broadcast frequency channel corresponding to the entry with the best registered reception quality among the existing entries is set as the reception target broadcast, as described above. Reception and output of the set reception target broadcast are started (step 514), and the process is terminated.

  Next, if it is determined in step 512 that there is no entry, the value is the same as the target ID (when the target ID is a SID), or the SID linked with the target ID (when the target ID is PI) ) Is registered in the SID table in which DAB service is registered (step 516).

  If there is an entry (step 516), the DAB service corresponding to the entry with the best registered reception quality is set as the reception target broadcast and set as described above. Reception and output of the received reception target broadcast are started (step 518), and the process is terminated.

  On the other hand, if there is no entry (step 516), the designated broadcast service is set as the reception target broadcast, reception and output of the reception target broadcast are started (step 520), and the process is terminated.

  According to such a reception target broadcast setting process, an audio quality that exceeds a predetermined standard during a set of receivable broadcast services that are broadcasting the same content as a designated broadcast service that is a broadcast service that starts or resumes output. If a DAB service or FM broadcast frequency channel that broadcasts audio is included, the service or FM broadcast frequency channel that broadcasts voice quality that exceeds the specified standard shall be used regardless of whether the reception quality is superior or inferior. Rather, it is set to a broadcast service that receives and outputs it preferentially over a DAB service that broadcasts audio of a quality lower than a predetermined standard included in the set.

  Therefore, it is possible to suppress the deterioration of the voice quality of the voice output to the user.

  DESCRIPTION OF SYMBOLS 1 ... Digital radio receiving part, 2 ... Analog radio receiving part, 3 ... Selector, 4 ... Audio signal processing part, 5 ... Speaker, 6 ... Control part, 7 ... Display part, 8 ... Operation part, 9 ... Memory, 11 ... DAB front end, 12 ... DAB decoder, 13 ... audio decoder, 21 ... FM front end, 22 ... FM demodulator, 23 ... RDS decoder.

Claims (15)

A radio broadcast receiver for receiving analog radio broadcast and digital radio broadcast,
A reception output unit that receives a broadcast service set as a reception output target broadcast service out of the analog broadcast broadcast service and the digital radio broadcast broadcast service, and outputs audio received by the broadcast service;
An alternative analog broadcast service that is a broadcast service of an analog radio broadcast that can be received by the radio broadcast receiving apparatus other than the reception output target broadcast service that performs the same content as the reception output target broadcast service, and the reception Alternative digital broadcast services that are broadcast services of the digital radio broadcast that can be received by the radio broadcast receiving apparatus other than the reception output target broadcast service, which are broadcasting the same content as the output target broadcast service, and each of the alternative digital An alternative broadcast service detector that detects the voice quality of the audio broadcast by the broadcast service;
A switching control unit for switching a reception output target broadcast service set in the reception output unit at a predetermined opportunity;
The switching control unit
In the alternative digital broadcasting service, when there is an alternative digital broadcasting service that broadcasts audio of a voice quality that exceeds a predetermined standard, the alternative digital broadcasting service that broadcasts audio of a voice quality that exceeds the predetermined standard , Switching the reception output target broadcast service set in the reception output unit,
If the alternative digital broadcast service does not exist and the alternative analog broadcast service exists, the alternative analog broadcast service includes the alternative analog broadcast service. A radio broadcast receiving apparatus that switches a reception output target broadcast service set in a reception output unit. The radio broadcast receiver according to claim 1,
The switching control unit
In the alternative digital broadcasting service, when there is only an alternative digital broadcasting service that broadcasts audio with an audio quality lower than a predetermined standard, and there is no alternative analog broadcasting service, the audio quality lower than the predetermined standard A radio broadcast receiving apparatus, wherein the reception output target broadcast service set in the reception output unit is switched to an alternative digital broadcast service that broadcasts the audio of the receiver. The radio broadcast receiver according to claim 1,
The alternative broadcast service detection unit detects reception quality of each alternative analog broadcast service and reception quality of each alternative digital broadcast service,
The switching control unit
In the alternative digital broadcasting service, when there is an alternative digital broadcasting service that broadcasts audio of a voice quality that exceeds a predetermined standard, the alternative digital broadcasting service that broadcasts audio of a voice quality that exceeds the predetermined standard To the alternative digital broadcast service with the best reception quality, switch the reception output target broadcast service set in the reception output unit,
If the alternative digital broadcast service does not exist and the alternative analog broadcast service exists, the alternative analog broadcast service includes the alternative analog broadcast service. A radio broadcast receiving apparatus, wherein a reception output target broadcast service set in the reception output unit is switched to an alternative analog broadcast service having the best reception quality. A radio broadcast receiver according to claim 3,
The switching control unit
In the alternative digital broadcasting service, when there is only an alternative digital broadcasting service that broadcasts audio with an audio quality lower than a predetermined standard, and there is no alternative analog broadcasting service, the audio quality lower than the predetermined standard A radio broadcast receiving apparatus, wherein the reception output target broadcast service set in the reception output unit is switched to an alternative digital broadcast service having the best reception quality among the alternative digital broadcast services for broadcasting the audio of The radio broadcast receiver according to claim 1, 2, 3 or 4,
The radio broadcast receiving apparatus according to claim 1, wherein the predetermined trigger is occurrence of degradation of reception quality of the reception output target broadcast service to a reception quality lower than a predetermined level in the reception output unit. A radio broadcast receiver for receiving analog radio broadcast and digital radio broadcast,
A reception output unit that receives a broadcast service set as a reception output target broadcast service out of the analog broadcast broadcast service and the digital radio broadcast broadcast service, and outputs audio received by the broadcast service;
An alternative to an analog radio broadcast service that can be received by the radio broadcast receiving apparatus, which uses the broadcast service targeted for reception and audio output as the target broadcast service, and broadcasts the same content as the target broadcast service. An analog broadcast service, an alternative digital broadcast service that broadcasts the same content as the target broadcast service, and is a digital radio broadcast broadcast service that can be received by the radio broadcast receiver, and broadcast by each alternative digital broadcast service An alternative broadcast service detector that detects the voice quality of the received voice;
A reception output target broadcast service setting unit that sets the output target broadcast service in the reception output unit;
The reception output target broadcast service setting unit,
In the alternative digital broadcasting service, when there is an alternative digital broadcasting service that broadcasts voice quality that exceeds a predetermined standard, the alternative digital broadcasting service that broadcasts voice quality that exceeds the predetermined standard , Set the reception output unit as a reception output target broadcast service,
If the alternative digital broadcast service does not exist and the alternative analog broadcast service exists, the alternative analog broadcast service is received. A radio broadcast receiving apparatus that is set in the reception output section as an output target broadcast service. The radio broadcast receiver according to claim 6,
The switching control unit
In the alternative digital broadcasting service, when there is only an alternative digital broadcasting service that broadcasts audio with an audio quality lower than a predetermined standard, and there is no alternative analog broadcasting service, the audio quality lower than the predetermined standard A radio broadcast receiving apparatus, wherein an alternative digital broadcast service that broadcasts a voice of the user is set in the reception output unit as a reception output target broadcast service. A radio broadcast receiver according to claim 1, 2, 3, 4, 5, 6 or 7,
The radio broadcast receiving apparatus according to claim 1, wherein the predetermined standard represents a standard sound quality of sound broadcast by the analog radio broadcast. A radio broadcast receiver according to claim 1, 2, 3, 4, 5, 6 or 7,
The radio broadcast receiving apparatus according to claim 1, wherein the predetermined criterion is a criterion that the audio quality of the monaural sound is an audio quality lower than the predetermined criterion. A radio broadcast receiver according to claim 1, 2, 3, 4, 5, 6 or 7,
The predetermined criterion is a criterion that the audio quality of the audio broadcast as a compression-encoded audio stream having a bit rate less than a predetermined bit rate is an audio quality lower than the predetermined criterion. A radio broadcast receiver. A radio broadcast receiver according to claim 1, 2, 3, 4, 5, 6 or 7,
The predetermined standard is that the number of audio channels is greater than or equal to stereo, and the audio quality of the audio broadcast as a compression-coded audio stream having a bit rate equal to or higher than the predetermined bit rate is equal to or higher than the predetermined standard. A radio broadcast receiver characterized in that it is a standard. A radio broadcast receiver according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.
The analog radio broadcast is an FM broadcast in which data is multiplexed into audio by RDS (Radio Data System),
The radio broadcast receiving apparatus according to claim 1, wherein the digital radio broadcast is DAB (Digital Audio Broadcasting). A radio broadcast receiver according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12,
The radio broadcast receiving apparatus is a radio broadcast receiving apparatus mounted on an automobile. A reception output unit configured to receive a broadcast service set as a reception output target broadcast service out of the analog broadcast broadcast service and the digital radio broadcast service, and to output the audio received by the broadcast service; In a radio broadcast receiver, a reception broadcast service setting method for setting a broadcast service as a reception output target broadcast service,
An alternative analog broadcast service that is a broadcast service of an analog radio broadcast that can be received by the radio broadcast receiving apparatus other than the reception output target broadcast service that performs the same content as the reception output target broadcast service, and the reception Alternative digital broadcast services that are broadcast services of the digital radio broadcast that can be received by the radio broadcast receiving apparatus other than the reception output target broadcast service, which are broadcasting the same content as the output target broadcast service, and each of the alternative digital An alternative broadcast service detection step for detecting the voice quality of the voice broadcast in the broadcast service;
A switching control step of switching a reception output target broadcast service set in the reception output unit at a predetermined opportunity,
In the switching control step,
In the alternative digital broadcasting service, when there is an alternative digital broadcasting service that broadcasts audio of a voice quality that exceeds a predetermined standard, the alternative digital broadcasting service that broadcasts audio of a voice quality that exceeds the predetermined standard , Switching the reception output target broadcast service set in the reception output unit,
If the alternative digital broadcast service does not exist and the alternative analog broadcast service exists, the alternative analog broadcast service includes the alternative analog broadcast service. A reception broadcast service setting method characterized by switching a reception output target broadcast service set in a reception output unit. A reception output unit configured to receive a broadcast service set as a reception output target broadcast service out of the analog broadcast broadcast service and the digital radio broadcast service, and to output the audio received by the broadcast service; In a radio broadcast receiver, a reception broadcast service setting method for setting a broadcast service as a reception output target broadcast service,
An alternative to an analog radio broadcast service that can be received by the radio broadcast receiving apparatus, which uses the broadcast service targeted for reception and audio output as the target broadcast service, and broadcasts the same content as the target broadcast service. An analog broadcast service, an alternative digital broadcast service that broadcasts the same content as the target broadcast service, and is a digital radio broadcast broadcast service that can be received by the radio broadcast receiver, and broadcast by each alternative digital broadcast service An alternative broadcast service detection step for detecting the voice quality of the received voice;
A reception output target broadcast service setting step of setting the output target broadcast service in the reception output unit;
In the reception output target broadcast service setting step,
In the alternative digital broadcasting service, when there is an alternative digital broadcasting service that broadcasts voice quality that exceeds a predetermined standard, the alternative digital broadcasting service that broadcasts voice quality that exceeds the predetermined standard , Set the reception output unit as a reception output target broadcast service,
If the alternative digital broadcast service does not exist and the alternative analog broadcast service exists, the alternative analog broadcast service is received. A reception broadcast service setting method, wherein the reception output unit is set as an output target broadcast service.