JP2003018035A - Digital audio broadcast receiver - Google Patents

Abstract

(57) [Summary] A DAB receiving apparatus needs to detect and reset service decoding information by an external control element. The output timing of the audio service cannot be specified, and the control of the audio decoding unit becomes complicated. The external control element needs to determine the decode information and the selection information of the service. There is a problem that the audio decoder unit operates at a constant operating frequency and consumes unnecessary power regardless of the presence or absence of the selected audio service. SOLUTION: A channel decoder unit corresponding to a function automatically detected by a channel decoder unit, a data frame control unit capable of discriminating between an audio service and a data service and outputting a prescribed data frame, and selecting a decoded service and Determine if the service you have discovered is
In the case of a mismatch, a selection service detection unit capable of outputting erroneous selection information and audio decoder means operable at an operating frequency optimized by the number of audio services to be decoded are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio broadcast receiving apparatus, and more particularly to a service data area in which a plurality of audio services and data services are multiplexed, and an information data area containing multiplexing information about the data area. The present invention relates to a digital audio broadcast receiving apparatus capable of receiving a digital audio broadcast signal and decoding an audio service and a data service.

[0002]

2. Description of the Related Art In digital audio broadcasting, a service data area (MSC (Main Service Channel) in which a plurality of audio services and data services are multiplexed is provided.
)) and an information data area (FIC (Fast Inf
ormation Channel)) is further multiplexed and transmitted.

In a digital audio broadcast receiving apparatus that receives such a digital audio broadcast, when the digital audio broadcast is received, the information data area is first decoded. Based on the decoded information of the service data area included in the decoded information data area, the audio service or the data service in the service data area is decoded according to the service selection command separately selected by the external control means. The decoded audio service and data service are output as digital data. Further, the service selected as the audio service is MPEG-decoded and output as audio data.

Here, the configuration and operation of the conventional digital audio broadcast receiving apparatus will be specifically described with reference to FIG. Note that FIG. 5 is a block diagram of a conventional digital audio broadcast receiving apparatus.

In the digital audio broadcasting (hereinafter, also referred to as "DAB") receiving device shown in FIG. 5, the DAB signal transmitted from the transmitter (broadcasting station) is transmitted to the antenna 1
Then, the DAB signal received by the RF unit 2 is converted into an intermediate frequency signal based on a predetermined reference frequency. The DAB signal converted into the intermediate frequency by the A / D conversion unit 3 is converted into a digital signal, and the DAB signal converted into the digital signal by the digital data demodulation unit 4 is subjected to a fast Fourier transform (FFT).
Process and demodulate based on the frequency components of each symbol.

DA demodulated by the digital data demodulation section 4
The B signal is transmitted to the deinterleave unit 6. The deinterleaver 6 is composed of two types of deinterleaver, a frequency deinterleaver and a time deinterleaver.
The information data area of the transmitted DAB signal is deinterleaved by the deinterleaving unit 6 and converted into a data string of the original information data area (hereinafter, also referred to as “FIC data”). The FIC data is transmitted to the channel decoder unit 5 and subjected to error correction processing. The FIC data subjected to the error correction processing is transmitted to the service selection control unit 52 and the system control unit 53.

On the other hand, the service data area of the demodulated DAB signal is subjected to frequency interleaving and time interleaving in the deinterleaving unit 6 to be converted into a data string of the original service data area (hereinafter also referred to as "MSC data"). To be converted.

The system control unit 53 uses the FIC data transmitted from the channel decoder unit 51 as the external control element 56.
(Hereinafter, also referred to as “microcomputer”). The microcomputer 56 detects the service decryption information for the service data area included in the FIC data, displays the information regarding the audio service and the data service on the operation display unit 57 based on the service decryption information, and the user displays the information. An audio service and a data service are selected according to each of the provided service information.

The microcomputer 56 sends information on each service selected on the operation display 57 to the system controller 53, and the system controller 53 sends the received selection information on each service to the service selection controller 52. Channel decoder unit 51
Sends each service selected from the MSC data deinterleaved and converted into the original data sequence to the data frame control unit 54 based on the service selection information received by the service selection control unit 52. The data frame control unit 54 converts the FIC data received from the channel decoder unit 51 and the selected MSC data into a specified data frame and outputs it. The audio service of the selected MSC data is transmitted to the audio decoder unit 55. The audio decoder unit 55 decodes the selected audio service sent from the data frame control unit 54 and converts it into audio data. Further, the program complement information (hereinafter, also referred to as “PAD data”) incidental to the selected audio service is decoded and transmitted to the microcomputer 11 via the system control unit 8, and the microcomputer 11 decodes the PAD data. Then, it is displayed on the operation display unit 12.

[0010]

In the conventional digital audio broadcast receiving apparatus, the service decoding information in the service data area included in the information data area is detected by the external control element. Further, the service decoding information of the service data area detected by the external control element needs to be set again in the service selection unit and the channel decoder unit by the external control element, and the external control element detects the service decoding information and selects the service. There is a problem (first problem) that the number of services to be selected is limited because the service must be done.

Further, each service in the service data area selected by the service selection control section and decoded by the channel decoder section is decoded in the order of the service identification signal and output as frame data. Therefore, since the output timing of the audio service cannot be specified, there is a problem (second problem) that control of the audio decoding unit that decodes the audio service must be complicated.

If the audio service or data service selected by the service selection control unit is not included in the received digital audio broadcast, the service not included in the broadcast signal cannot be decoded. However, since there is no means to report that the selected service could not be decoded, in order to determine that the selected service is not included, the external control element that selects the service must determine by itself. There was an issue (third issue).

Further, since the audio decoder section always operates at a constant operating frequency, when the number of selected audio services is small, no audio service is selected, or the selected audio service cannot be decoded. Even in such a case, there is a problem (fourth problem) that power is wasted because it operates at a constant operating frequency.

The present invention has been made to solve the first problem described above. For example, according to the purpose of a digital audio broadcast receiving apparatus, a service data area included in an information data area of a digital audio broadcast signal is included. It is an object of the present invention to provide a digital audio broadcast receiving apparatus having a channel decoder unit corresponding to the function of automatically detecting the service decoding information by the conventional external control element, as well as the function of automatically detecting it by the channel decoder unit. .

The present invention has been made to solve the above-mentioned second problem. For example, it is selected by the service selection control means and decoded by the channel decoding means according to the purpose of the digital audio broadcast receiving apparatus. It is an object of the present invention to provide a digital audio broadcast receiving apparatus having a data frame control unit capable of discriminating between an audio service and a data service to be output as audio data in each of the provided services and outputting the defined data frame. To do.

The present invention has been made to solve the above-mentioned third problem. For example, the decoded audio service and the data service and the selected audio service are selected according to the purpose of the digital audio broadcast receiving apparatus. An object of the present invention is to provide a digital audio broadcast receiving apparatus having a selection service detection means capable of determining whether or not a service and a data service can be detected and, if they do not match, output erroneous selection information. Is.

The present invention has been made to solve the above-mentioned fourth problem. For example, the decoded audio service matches the selected audio service according to the purpose of the digital audio broadcast receiving apparatus. It is an object of the present invention to provide a digital audio broadcast receiving apparatus having operating frequency generation means for generating an optimized operating frequency according to the number of audio services and audio decoder means operable according to the generated operating frequency. It is a thing.

[0018]

In a digital audio broadcast receiving apparatus according to the present invention, a first invention relates to a service data area in which one or a plurality of audio services and data services are multiplexed and the service data area. A digital audio broadcast receiving apparatus for receiving a digital audio broadcast having an information data area including multiplexed information, wherein the information data area of the received digital audio broadcast is decoded, and based on the information of the decoded information data area. Automatic channel decoding means for decoding all one or more multiplexed audio services and data services in the service data area of digital audio broadcasting, and decoding and decoding the information data area of the received digital audio broadcasting. A manual channel decoding means for selecting and decoding the audio service and the data service to be decoded by the external control means based on the information in the report data area, and the automatic channel decoding means and the manual channel decoding means by the external control means. And channel decoding switching means capable of arbitrarily switching between, and an automatic service selecting means for selecting all services of audio services and data services decoded by the automatic channel decoding means based on the received information data area of the digital audio broadcast. ,
Manual service selection means for selecting a service to be output as service data from the multiplexed service data area of the digital audio broadcast received by the external control means based on the received information data area of the digital audio broadcast, and the external control A service selection switching means capable of arbitrarily switching the automatic service selection means and the manual service selection means by means, and audio data based on the received information data area of the digital audio broadcast by the external control means. And an audio service selecting means for selecting an audio service to be output as a digital audio broadcast receiving apparatus.

A second aspect of the invention is the audio service and data service according to the first aspect, which are decoded by the automatic channel decoding means or the manual channel decoding means and selected by the automatic service selecting means or the manual service selecting means. To a specified data frame, and a data frame converted by the data frame control means into a specified data frame, the audio service selected by the audio service selection means is decoded into audio data. An audio decoding device for converting and outputting the digital audio broadcast receiving device.

A third aspect of the invention is the same as the first or second aspect, wherein the audio service and the data service decoded by the automatic channel decoding means or the manual channel decoding means, and the automatic service selecting means or the manual service selecting. Comparing the audio service and the data service selected by the means, and the audio service selected by the audio service selecting means, and determining whether the decoded audio service and the data service can output the selected audio service and the data service. The digital audio broadcast receiving apparatus is provided with a selected service detecting means for

[0021] In a fourth aspect based on the second aspect, the audio decoding means includes information on the decoded audio service detected by the selected service detecting means according to the third aspect and the selected audio service. Depending on the number of audio services for which the information in
It is a digital audio broadcast receiving apparatus comprising an audio decoder frequency conversion control means for changing the operating frequency of the audio decoding means.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a digital audio broadcast receiving apparatus according to the present invention will be described below with reference to the drawings. In each figure, the same parts as those in the conventional example shown in FIG. 5 are designated by the same reference numerals.

The configuration and operation of the digital audio broadcast receiving apparatus of the present invention will be specifically described with reference to FIG. FIG. 1 is a block diagram of a digital audio broadcast receiving apparatus of the present invention.

The digital audio broadcasting (DA
B) In the receiver, the DAB signal transmitted from the transmitter (broadcasting station) is received by the antenna 1, and the DAB signal received by the RF unit 2 is converted into an intermediate frequency signal based on a predetermined reference frequency. The DAB signal converted into the intermediate frequency by the A / D conversion unit 3 is converted into a digital signal, and the DAB signal converted into the digital signal by the digital data demodulation unit 4 is subjected to a fast Fourier transform (FFT) process to obtain the frequency of each symbol. Demodulate based on the component.

Hereinafter, the configuration of the digital broadcast receiving apparatus according to the embodiment of the present invention will be described with reference to FIG. 2 is a block diagram showing an embodiment of the channel decoder unit 5 and the service selection control unit 7 of the present invention.

DA demodulated by the digital data demodulation section 4
The B signal is transmitted to the deinterleave unit 6. The deinterleaver 6 is composed of two types of deinterleaver, a frequency deinterleaver and a time deinterleaver.
The information data area of the transmitted DAB signal is deinterleaved by the deinterleaving unit 6 and converted into the original data string (FIC data) of the information data area. F
The IC data is subjected to error correction processing by the data error correction unit 21 of the channel decoder unit 5, all service decoding information of the service data area included in the FIC data is decoded by the FIC data decoding unit 22, and the channel decoder switching unit 24. Sent to. Further, the user can directly set the service decryption information on the operation display unit 12. The service decryption information that has been set is the microcomputer 1
1, is transmitted to the service decryption information detection unit 23 via the system control unit 8. The channel decoder switching unit 24 is
Direct service decoding information switching signal (DSCHPRF) F
All the service decryption information in the service data area included in the IC data and the selected service decryption information are switched.

The service decoding information selected by the channel decoder switching unit 24 is stored in the service decoding information storage unit 25, and the DAB signal demodulated by the digital data demodulation unit 4 is stored on the basis of the stored service decoding information. The service data area is subjected to frequency interleaving and time interleaving by the deinterleaving unit 6 and converted into the original data string (MSC data) of the service data area.

On the other hand, the service decoding information of all the service data areas included in the FIC data converted by the FIC data decoding unit 22 is the service selection control switching unit 2.
7 and can be used as selected service information. In addition, the same FIC data is stored in the system control unit 8
Is transmitted to the microcomputer 11 via. Based on the FIC data, the user can select a service to be output as a data service via the operation display unit 12. The selected service information selected by the user is transmitted to the service selection detection unit 26 via the microcomputer 11 and the system control unit 8.

The service selection information of all the service data areas included in the above-mentioned FIC data and the service selection information selected by the user are switched by the service selection switching signal (AMSEL) by the service selection control switching unit 27, and the selected services are selected. It is transmitted to the detection unit 29.

Further, the FIC transmitted to the microcomputer 11
Based on the data, the user can select a service to be output as an audio service via the operation display unit 12. The selected audio service information selected by the user is transmitted to the audio service selection control unit 28 via the microcomputer 11 and the system control unit 8.

The selected service detection unit 29 decodes the MSC data stored in the service decoding information storage unit 25 and the MS selected by the service selection control switching unit 27.
The selection information of the C data is compared and verified, and the MSC data of the selected selected service and the service identification signal (SCHID) are transmitted to the data frame control unit 9. Further, the decoding information of the MSC data stored in the previous service decoding information storage unit 25, the selection information of the MSC data selected by the service selection control switching unit 27, and the selected audio service transmitted to the audio service selection control unit 28. MSC of selected audio service that matches and verifies information and matches
The data, service identification signal (SCHID), and audio selection information (AUSEL) are transmitted to the data frame control unit 9. Further, the selected service detecting section 29 transmits an output discriminating signal (MPEGDEC) of the selected selected audio service that has been compared and verified to the clock signal control section 13.

On the other hand, when the decoding information of the MSC data stored in the service decoding information storage unit 25 and the selection information of the MSC data selected by the service selection control switching unit 27 do not match, a data service erroneous selection signal (SCH)
ERR) to the system controller 8. The decoding information of the MSC data stored in the service decoding information storage unit 25, the selection information of the MSC data selected by the service selection control switching unit 27, and the selected audio service information transmitted to the audio service selection detection unit 28 are also included. If any of the information does not match, the audio service erroneous selection signal (AUDER) is transmitted to the system control unit 8. System control unit 8 that receives the data service misselection signal or the audio service misselection signal
The microcomputer 1 that it has received each erroneous selection signal.
1 and the microcomputer 11 performs a service information selection / correction process.

Hereinafter, the configuration of the digital broadcast receiving apparatus according to the embodiment of the present invention will be described with reference to FIG. 3 is a block diagram showing an embodiment of the data frame control unit 9 of the present invention.

The data frame control unit 9 receives the MS transmitted from the selected service detecting unit 29 of the channel decoder unit 5.
MSC data and service identification signal (SCHID) in which C data decode information and MSC data selection information match
Also, the audio selection information (AUDSEL) and the FIC data subjected to the error correction processing by the data error correction unit 21 of the channel decoder unit 5 are respectively received. F received
The IC data and the MSC data are the frame data generation unit 31.
DAB frame data (fdat) is converted by
In the B frame data timing control unit 36, the frame data reference clock (doc
lk) and the timing is adjusted, and the DAB frame data (dot) is output.

Further, the FIC data is transmitted to the FIC data reference signal generator 32, and the FIC of the DAB frame data is transmitted.
The FIC reference signal (fwfic) indicating the IC data section is generated, and the DAB frame data timing control unit 36 adjusts the timing with the frame data reference clock (doclk) together with other frame information to obtain the FIC data reference signal (dowfic). Is output.

On the other hand, the MSC data is transmitted to the MSC data reference signal generator 33, and the M of the DAB frame data is transmitted.
The MSC reference signal (fwmsc) indicating the SC data section is generated, and the DAB frame data timing control unit 36 adjusts the timing with the frame data reference clock (doclk) together with other frame information to obtain the MSC data reference signal (dowmsc). Is output. Also,
The generated MSC reference signal is transmitted to the MSCID reference signal generation unit 34, and the service identification signal (SCH) transmitted from the selected service detection unit 29 of the channel decoder unit 5.
ID) and a service reference signal (fwmno) indicating which service the MSC data section of the DAB frame data is transmitting, and the DAB frame data timing control unit 36, together with other frame information,
The timing is adjusted with the frame data reference clock (doclk) and output as a service reference signal (downno). The audio data reference signal generator 35
According to the audio selection information (AUDSEL) transmitted from the selection service detection unit 29 of the channel decoder unit 5,
In the MSC data section of the DAB frame data, an audio data reference signal indicating MSC data to be decoded as audio data is generated, and the DAB frame data timing control unit 36, together with other frame information, a frame data reference clock (doclk) and timing. The audio data reference signal (audw
in) to the audio decoder unit 10.

The configuration of the digital broadcast receiving apparatus according to the embodiment of the present invention will be described below with reference to FIG. 4 is a timing chart showing an embodiment of the data format generated and output by the data frame controller 9 of the present invention. In FIG. 4, services of service identification signals (SCHID) 1 to 5 are selected as service data, match the decoding information, and are output as a data frame. Particularly, the service identification signal (SCHID) 3 is output as audio data. Which indicates that.

The audio decoder unit 10 receives the DAB frame data (f
dat) and audio data reference signal (audwin)
Detects the selected audio service data and converts it into voice data. Also, program supplement information (PAD) attached to the selected audio service
(Data) is decoded and transmitted to the microcomputer 11 via the system control unit 8, and the microcomputer 11 decodes the PAD data and displays it on the operation display unit 12. At this time, the audio decoder unit 10 optimizes the audio decoder operating frequency (from the clock signal control unit 13) based on the audio service output determination signal (MPEGDEC) output from the selected service detection unit 29 of the channel decoder unit 5. MCLK), for example, when a plurality of audio services are selected, the operating frequency of the audio decoder operates at a high speed, and when no audio service is selected, the audio decoder operating frequency is stopped and the audio decoder operates. The section 10 is also stopped.

As is clear from the above description, the present invention provides, for example, a service data area in which a plurality of audio services and data services are multiplexed,
In a digital audio broadcast receiving apparatus that receives a digital audio broadcast that is broadcast by being configured with an information data area including multiplexed information related to the data area, the information data area of the received digital audio broadcast is decoded, and the decoding is performed. Based on the information in the information data area, the automatic channel decoding means for decoding all multiplexed audio services and data services in the service data area of the digital audio broadcasting, and the information data area of the received digital audio broadcasting A manual channel decoding means for decoding and selecting and decoding an audio service and a data service to be decoded by the external control means based on the information in the decoded information data area, and an external control means. A channel decoding switching unit that can arbitrarily switch between the automatic channel decoding unit and the manual channel decoding unit, and an audio service decoded by the automatic channel decoding unit based on the received information data area of the digital audio broadcast. Data service Output as service data from the multiplexed service data area of the digital audio broadcast received by the external control means based on the automatic service selection means for selecting all services and the information data area of the received digital audio broadcast. The manual service selection means for selecting a service and the external control means allow the service selection switching means and the external control means capable of arbitrarily switching between the automatic service selection means and the manual service selection means to receive the service. Based on the information data area of the digital audio broadcasting can be realized by the digital audio broadcasting reception apparatus characterized by comprising an audio service selection means for selecting the audio service to be output as audio data.

Further, according to the present invention, the automatic service selecting means or the manual service selecting means is decoded from the multiplexed service data area of the digital audio broadcast received by the automatic channel decoding means or the manual channel decoding means, for example. A data frame control unit for converting the audio service and the data service selected by the data frame control unit into a specified data frame, and the data frame converted into the specified data frame by the data frame control unit, selected by the audio service selection unit. And an audio decoding unit that decodes the audio service, converts the audio service into audio data, and outputs the audio data.

Further, the present invention provides an audio service and data service decoded from a multiplexed service data area of a digital audio broadcast received by, for example, automatic channel decoding means or manual channel decoding means, and automatic service selecting means. , Or the audio service and data service selected by the manual service selection means, and the audio service selected by the audio service selection means are compared, and the decoded audio service and data service and the selected audio service and data service are output. It can be realized by a digital audio broadcast receiving apparatus characterized by further comprising a selection service detecting means for determining whether or not it is possible.

Further, according to the present invention, for example, in the audio decoding means, the information of the audio service decoded by the selected service detecting means is matched with the information of the selected audio service according to the number of audio services. It can be realized by a digital audio broadcast receiving device characterized by further comprising an audio decoder frequency conversion control means for changing an operating frequency.

[0043]

As described in detail above, according to the digital audio broadcast receiving apparatus of the present invention, for example, it is included in the information data area of the digital audio broadcast signal according to the purpose of use of the digital audio broadcast receiving apparatus. In addition to the function of detecting the service decoding information of the service data area by the conventional external control element, it is possible to provide a digital audio broadcast receiving apparatus having a channel decoder unit corresponding to the function of automatically detecting by the channel decoder unit, This has the effect of reducing the load on the control mechanism of the external control element.

Further, according to the present invention, for example, in each service selected by the service selecting means and decoded by the channel decoding means according to the purpose of the digital audio broadcasting receiving apparatus, an audio service and a data service which are output as audio data. It is possible to provide a digital audio broadcast receiving apparatus having a data frame control unit capable of determining and determining and outputting a specified data frame, and the position of audio service data can be specified. This has the effect of simplifying the mechanism.

Further, according to the present invention, for example, the decoded audio service and data service and the selected audio service and data service can be detected and matched according to the purpose of the digital audio broadcast receiving apparatus. If not, it is possible to provide a digital audio broadcast receiving device having a selection service detecting means capable of outputting erroneous selection information, and it is possible to easily determine whether the service selection is correct or incorrect. Have.

Further, according to the present invention, for example, depending on the purpose of the digital audio broadcast receiving apparatus, an optimized operating frequency is generated by the number of audio services in which the decoded audio service and the selected audio service match. It is possible to provide a digital audio broadcast receiving apparatus having an operating frequency generating means and an audio decoder means operable according to the generated operating frequency, and it is possible to suppress unnecessary power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital audio broadcast receiving apparatus of the present invention.

FIG. 2 is a block diagram showing an embodiment of a channel decoder unit 5 and a service selection control unit 7 of the present invention.

FIG. 3 is a block diagram showing an embodiment of a data frame control unit 9 of the present invention.

FIG. 4 is a timing chart showing an embodiment of a data format generated and output by the data frame control unit 9 of the present invention.

FIG. 5 is a block diagram showing an embodiment of a conventional digital audio broadcast receiving apparatus.

[Explanation of symbols]

1 antenna 2 RF section 3 A / D converter 4 Digital data demodulator 5 channel decoder 6 Deinterleaver section 7 Service selection control unit 8 System control unit 9 Data frame controller 10 Audio decoder section 11 External control element 12 Operation display section 13 Clock signal controller 21 Data error correction unit 22 FIC data decoding section 23 Service Decryption Information Detection Unit 24-channel decoder switching unit 25 Service Decryption Information Storage Unit 26 Service selection detector 27 Service selection control switching unit 28 Audio Service Selection Detection Unit 29 Selected service detector 31 frame data generator 32 FIC data reference signal generator 33 MSC data reference signal generator 34 MSCID reference signal generator 35 audio data reference signal generator 36 DAB frame data timing controller

Claims (4)

[Claims] 1. A digital audio broadcast reception for receiving a digital audio broadcast having a service data area in which one or more audio services and data services are multiplexed and an information data area including multiplexing information about the service data area. A device for decoding the received information data area of the digital audio broadcast and multiplexing one or more audio services and data of the service data area of the digital audio broadcast based on the information of the decoded information data area. An automatic channel decoding means for decoding all the services, and an audio service for decoding the information data area of the received digital audio broadcast and decoding by the external control means based on the information in the decoded information data area. In addition, a manual channel decoding means for selecting and decoding a data service, a channel decoding switching means capable of arbitrarily switching between the automatic channel decoding means and the manual channel decoding means by the external control means, and the received digital signal. Automatic service selecting means for selecting all services of audio services and data services decoded by the automatic channel decoding means based on the information data area of the audio broadcast; and the external device based on the information data area of the received digital audio broadcast. Manual service selection means for selecting a service to be output as service data from the multiplexed service data area of the digital audio broadcast received by the control means, and the automatic service selection by the external control means Service selection switching means capable of arbitrarily switching between the stage and the manual service selection means, and the external control means for selecting an audio service to be output as audio data based on the information data area of the received digital audio broadcast. A digital audio broadcast receiving apparatus, comprising: 2. Data frame control means for converting the audio service and data service decoded by the automatic channel decoding means or the manual channel decoding means and selected by the automatic service selecting means or the manual service selecting means into a prescribed data frame. And an audio decoding means for decoding the audio service selected by the audio service selecting means from the data frame converted to the prescribed data frame by the data frame control means, converting the audio service to audio data, and outputting the audio data. The digital audio broadcast receiving apparatus according to claim 1, characterized in that: 3. An audio service and a data service decoded by the automatic channel decoding means or the manual channel decoding means, an audio service and a data service selected by the automatic service selecting means or the manual service selecting means, and an audio service selection. A selection service detecting means is provided for comparing the audio services selected by the means to determine whether the decoded audio services and data services can output the selected audio services and data services. The digital audio broadcast receiving apparatus according to claim 1 or 2. 4. The audio decoding means according to claim 3.
The audio decoder frequency conversion control means for changing the operating frequency of the audio decoding means according to the number of audio services in which the information of the decoded audio service detected by the described selected service detecting means and the information of the selected audio service match. The digital audio broadcast receiving apparatus according to claim 2, wherein