JPH11112449A - Multiplex broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiplex broadcast receiver capable of outputting pluralities of multiplexed programs simultaneously and having excellent operability. SOLUTION: A digital audio broadcasting DAB receiver 1 includes a DAB front end section 4, a DAB decode section 6, two audio decode sections 8, 10, two D/A converters 12, 14, a recording section 22, a control section 34, an operation section 38 and a display section 40. In the case of generating and outputting audio data by the DAB service by using one of the audio decode sections (8), when a broadcast with a prescribed announcement included in a same ensemble as this service is started, the audio data of this announcement are generated by using the other audio decode section 10. The audio outputs in the two systems are attained, and the audio data of the announcement are recorded by a recording section 22 or outputted in overlapping with the audio data of the service.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multiplex broadcast receiver for selecting any one of a plurality of programs multiplexed on carrier waves of different frequencies.

[0002]

2. Description of the Related Art Today, digital audio is generally recognized for its excellent characteristics and ease of use, and is rapidly spreading. Against this background, digitalization of audio broadcasting has become active, and digital audio broadcasting DAB (Digital Audio Broadcasting) has been put to practical use in Europe.

[0003] Such a DAB receiver (DAB receiver) has a considerably complicated configuration as compared with a normal VHF / FM receiver, but has many advantages that can be compensated for. For example, in a moving car, sound quality comparable to a CD can be secured, many broadcast programs can be received, programs can be broadcast in multiple languages, weather and traffic information can be received continuously, and audio and video advertisements can be received. There are advantages such as.

[0004] Currently, each broadcast channel of DAB uses a vacant frequency between reception frequencies allocated to each channel of television broadcasting, and a total of 64 channels are prepared. A carrier frequency group corresponding to each broadcast channel is called an ensemble, and a plurality of broadcast programs (services) are multiplexed on each ensemble.

[0005]

A DAB signal transmitted from a broadcasting station includes an announcement supported by each service, in addition to a plurality of services including various news and music. Announcements broadcast for DAB include emergency broadcasts, road traffic information, weather forecast broadcasts, etc. Among them, emergency broadcasts are supported by all services. For this reason, while receiving each service, it is possible to listen to an emergency broadcast and announcements supported by each other service. For example, if a service supports announcements of road traffic information and news broadcasts, by switching the output audio from the service to the announcement while receiving the service, it is possible to provide information on road traffic information and news broadcasts. Listen to announcements.

In the DAB receiver, the type of service or announcement is specified in advance, and the setting is made such that when the specified service or the like is broadcast, the service is automatically switched to the specified service or the like. However, the services etc. are suddenly switched while listening to any of the services, so if you want to continue listening to the services you have received so far, you need to cancel the newly switched services etc. each time Yes, the operation was complicated and the operability was poor. Also, even if a plurality of services and announcements are multiplexed on one signal, only one service can be listened to at the same time. It was inconvenient to hear only one of the services or announcements.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a multiplex broadcast receiver capable of simultaneously outputting a plurality of multiplexed programs and having good operability. To provide.

[0008]

In order to solve the above-mentioned problem, a multiplex broadcast receiver according to the present invention has a plurality of decoding means, and a plurality of program data multiplexed into one signal. Then, by decoding the plurality of program data in parallel, it is possible to output audios of a plurality of programs at the same time. Further, by further comprising a decoded data storage unit for storing the decoded data output from any of the plurality of decoding units described above, based on the decoded data output from any of the plurality of decoding units. At the same time as outputting the audio of the program, the decoded data output from the remaining decoding means can be stored in the background. In particular, if this is notified after the storing operation is completed, and the user is instructed to reproduce the program, the program audio or the like is output based on the stored decoded data. A plurality of programs broadcasted during the time zone can be output at staggered times, and both can be enjoyed without being missed. In addition, since the decoded data of one of the programs is stored in the background as described above, if a setting is made to search for a desired program without interrupting the sound and the like of the remaining programs, Each time the program is switched, complicated operations such as switching back to the original program are not required, and operability can be improved.

Also, instead of storing the decoded data output from any of the encoding means and reading it out later and outputting the audio or the like of the program, the tone of a plurality of programs is output with the tone added. May be. By simultaneously outputting the sounds of a plurality of programs in this way, it is possible to know the general contents of the small sound programs while mainly listening to the high sound programs, and to listen to both programs.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A DAB receiver according to an embodiment to which the multiplex broadcast receiver of the present invention is applied is provided with two audio decoding units, and outputs audio of a program by using one of the audio decoding units, and uses the other by using the other. It is characterized in that program audio is recorded in the background. The above-mentioned program includes both the DAB service and the announcement. Hereinafter, a DAB receiver according to an embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a D according to an embodiment of the present invention.
It is a figure showing the composition of AB receiver. The DAB receiver 1 shown in FIG. 1 includes a DAB antenna 2, a DAB front-end (F / E) unit 4, a DAB decoding unit 6, audio decoding units 8 and 10, a digital-analog converter (D / A
A converter) 12 and 14, amplifier 16, speaker 1
8, switch sections 20, 36, recording section 22, FM / AM antenna 24, FM / AM front end section 26, FM / AM
AM demodulator 28, RDS (Radio Data System) decoder 30, CD player 32, controller 34, operation unit 3
8, the display unit 40 is included.

A DAB front-end unit 4 extracts a desired reception frequency (tuning frequency) component from a signal received via the DAB antenna 2 and an intermediate frequency obtained by performing frequency conversion on the extracted signal. Output a signal. The DAB decoding unit 6 performs a quadrature demodulation process, an FFT (fast Fourier transform) demodulation process, and a decoding process on the intermediate frequency signal output from the DAB front end unit 4, and demodulates the interleaved transmission data. Further, after deinterleaving and returning to the original data sequence, an error detection and correction process is performed, and a high-speed information channel FIC or decoded data (MPEG) including a service list of each ensemble indicating the symbol position of the multiplexed broadcast program is displayed. Audio data).

The audio decoding sections 8 and 10
The decoded data (MPEG
Audio data), and outputs expanded PCM audio data. D / A converter 1
2 and 14 convert the PCM audio data output from the audio decoding unit 8 or the audio decoding unit 10 into an analog signal and output it. Amplifier 16
Amplifies an analog audio signal output from the D / A converters 12 and 14 or an analog audio signal output from an FM / AM demodulator 28 or a CD player 32, which will be described later. Output from the speaker 18.

The switch unit 20 outputs an audio signal input from the D / A converter 14 to the switch unit 36 in response to a switching instruction from the control unit 34, or
2 is switched to output. The recording unit 22 records an audio signal input from the D / A converter 14 via the switch unit 20.

The FM / AM front-end unit 26
A desired reception frequency (tuning frequency) component is extracted from a signal received via the AM antenna 24,
An intermediate frequency signal obtained by performing frequency conversion on the extracted signal is amplified. The FM / AM demodulation unit 28
AM detection or FM detection is performed on the intermediate frequency signal output from the FM / AM front end unit 26,
Outputs analog audio signals. Further, when receiving FM broadcast, the FM / AM demodulation unit 28 separates the FM multiplex signal included in the signal after detection and outputs it to the RDS decoding unit 30. The RDS decoding unit 30
The delay detection is performed on the FM multiplexed signal output from the FM / AM demodulation unit 28 to reproduce the bit clock and demodulate the bit data sequence. The CD player 32 reproduces music or the like recorded on a CD and outputs an analog audio signal.

The control unit 34 includes a DAB front-end unit 4
The entire DAB receiver 1 is controlled by performing frequency tuning control by the FM / AM front-end unit 26, a service switching instruction to the DAB decoding unit 6 and the RDS decoding unit 30, and the like. In addition, the control unit 34 sends a switching instruction to the switch units 20 and 36, and also instructs the recording unit 22 to record or reproduce an audio signal. The switch unit 36 receives the D / A converter 12 and the switch unit 2 in response to a switching instruction output from the control unit 34.
0, and selectively outputs an audio signal input from any one of the recording unit 22 and the CD player 32. The operation unit 38 includes various operation keys for inputting operation instructions such as a program switching instruction from the user, and sends the operation state of the operation keys by the user to the control unit 34. The display unit 40 displays the name given to the currently received DAB program, and displays the operation status of the operation unit 38 by the user.

The above-described DAB front end unit 4, DA
The B decoding unit 6 and the control unit 34 serve as a receiving unit, the DAB decoding unit 6 serves as a separating unit, and the audio decoding units 8 and 10
Corresponds to a plurality of decoding units, the recording unit 22 corresponds to the decoded data storage unit, the display unit 40 corresponds to the notifying unit, and the control unit 34 corresponds to the program reproducing unit.

FIG. 2 is a diagram showing a mode II frame structure employed in the DAB receiver 1. One frame length is 24 ms, and a two-symbol synchronization signal SYN
C, a high-speed information channel FIC of 3 symbols, and a data field DFL of 72 symbols. The synchronization signal SYNC includes a null symbol and a phase reference symbol PRS used to recognize the start point of the frame.

The high-speed information channel FIC is composed of three high-speed information blocks FIB. The data field DFL is divided into 72 data fields, and a broadcast signal of a predetermined service and announcement is inserted in each data field, so that 6 to 8 services can be received simultaneously from one broadcast wave. Has become. Which service corresponds to which data field is specified by array data of services included in the high-speed information channel FIC.

The high-speed information block FIB is composed of a plurality of high-speed information groups FIG. Each high-speed information group FIG includes a FIG header and a FIG data field. The FIG header is composed of "FIG type" indicating the type of data included in the FIG data field, and "length" indicating the byte length of the FIG data field. The first byte of the FIG data field has different contents for each FIG type, and an extension is included in a part thereof.

For example, in the case of a type 0 field,
In the first byte of the FIG data field, a C / N (Current / Next) flag and an OE (Other En
semble) flag, P / D flag, and extension. The contents of the detailed data included in the FIG data field are defined by the FIG type and the extension. Hereinafter, for example, a data field corresponding to the extension 17 of the FIG type 0 field is represented as FIG (0/17).

The area excluding the first byte of the FIG data field contains various data specified by the FIG type and the extension. By reading this data, various reception controls can be performed. . For example, FIG. (0/5) shows the language code used, and FIG. (1/0) and FIG. (1/1) show the ensemble names and service names displayed on the display unit 22 during program reception. The corresponding text data is included.

Hereinafter, the high-speed information data group FIG required for the receiving operation in the present embodiment will be described.
Fig (0 /
2) is an ensemble identification EId and a service identification S for identifying a service included in the ensemble of interest.
Id. By analyzing FIG (0/2) related to the service list in these ensembles, for example, the service identification Sid of each service included in the currently received ensemble can be known. Also, FIG (0 /
By analyzing 1), data for receiving the service can be detected.

FI related to program type (PTy)
G (0/17) is the service identification Sid, Int (Inte
rnational) code, course (Coarse) code, and fine (Fine) code. The service identification SId is an identifier given to each service. The Int code indicates a category of a basic program type such as "news" or "sports". Normally, only this Int code is transmitted from a broadcasting station, but a course code or a fine code indicating a more detailed classification may be transmitted.

FIG. (0/18) for announcement support for the currently received ensemble is:
Announcement support (Asu) flag, Number of clusters, Cluster Id
It is comprised including. The Asu flag is a flag indicating an announcement type supported by the service specified by the service identification Sid at the head. The announcement type includes emergency broadcast, road traffic information broadcast, news broadcast, weather forecast broadcast, and the like. The number of clusters indicates the number of subsequent clusters Id, and the maximum is 2
It is 3. The cluster Id is the service identification SId
Is an identifier for identifying an announcement group (announcement cluster) supported by the service indicated by.

FIG. (0/19) relating to announcement switching for the currently received ensemble
Is the cluster Id, announcement switching (A
sw) flag, new flag (New flag), region flag (Region flag), sub-channel identification (SubChI
d). The Asw flag indicates the broadcast state of the announcement cluster indicated by each cluster Id. When the announcement belonging to the cluster Id is being broadcast, the bit corresponding to the announcement type being broadcast in the Asw flag is set to “1”, and when the announcement is not being broadcast, Is the A corresponding to the cluster Id
The sw flag is all cleared to "0". The new flag indicates whether the announcement of interest has been transmitted for the first time (the flag is “1”) or a previously broadcasted one has been retransmitted (the flag is “0”). This is a flag.

FIG. Related to announcement support
By analyzing (0/18) and FIG. (0/19) related to announcement switching, it is possible to know the announcements supported by each service, and to determine whether or not the announcement is being broadcast. If it is being broadcast, it can be known whether or not it is retransmitted.

FIG. (0/6) and FIG. (0) related to frequency information of service and ensemble
/ 21) includes the service identification SId of each service and the reception frequency of an ensemble that can receive the service of interest. FIG (0 /
By analyzing 6) and FIG (0/21), for example, it is possible to know the reception frequency of an ensemble that can receive a certain service.

FIG. (0/25) regarding announcement support for ensembles not currently being received
Is configured to include an announcement support (Asu) flag and an ensemble identification EId. The Asu flag is a flag indicating the announcement type supported by the service specified by the service identification Sid at the head (ensemble service not currently being received). In the ensemble identification EId, an identification number corresponding to an ensemble capable of receiving an announcement of interest is set.

FIG. (0/2) regarding announcement switching for an ensemble not currently being received
6) includes an announcement switching (Asw) flag, a new flag, a region flag, and an ensemble identification EId. Ensemble identification E
In the Id, an identification number corresponding to an ensemble capable of receiving the current announcement is set.

The DAB receiver 1 of this embodiment has such a configuration, and its operation will be described next. FIG.
Is an operation in the case where the DAB receiver 1 of the present embodiment receives an announcement included in the same ensemble as the service in parallel with the operation of receiving the DAB service and outputting the audio, and performs the recording or audio output. It is a flowchart which shows a procedure. It is assumed that the voice of any service is currently being output from the speaker 18. In addition, the user operates the operation unit 38 to specify an announcement to be searched, such as a news broadcast or road traffic information, and performs an operation of searching for the announcement (for example, monitoring the presence or absence of the specified announcement). Then, it is assumed that a search operation in a watch mode in which a search is performed until this announcement is detected is being executed.

The control unit 34 is operated by an operation unit 38 by the user.
Is operated to monitor whether or not an instruction to reproduce the recorded announcement has been made (step 101). When the reproduction instruction has been made, an audio signal corresponding to the announcement is recorded in the recording unit 22. It is determined whether or not it has been performed (step 102). When the voice signal of the announcement is recorded in the recording unit 22, the control unit 34
The recorded audio signal is read, and a switching signal is sent to the switch unit 36 to output the audio signal output from the recording unit 22 to the amplifier 16 to reproduce the audio (step 103).

When the above-described sound reproducing operation is completed, or when the instruction to reproduce the recorded announcement is not given (in the case of a negative determination in step 101), or when there is no sound of the announcement recorded in the recording unit 22 In this case (in the case of a negative determination in step 102), the control unit 34 next determines whether or not the broadcast of the announcement that is a search target specified by the user in advance has started (step 104). . To determine whether the broadcast of the specified announcement has started,
Specifically, the announcement (A0) having the Asw flag to be searched may be a figure (0) related to the announcement switching of the ensemble currently being received.
/ 19), it is determined that the broadcast of the specified announcement has started.

When the broadcast of the specified announcement is started, the control unit 34 determines whether or not the voice output of the specified announcement is instructed (step 105), and instructs to output the voice. If not, it is determined whether recording has been instructed (step 106). These instructions are given in advance by the user operating the operation unit 38 as necessary. If neither instruction has been issued, the process returns to step 101 and the monitoring state of the playback instruction of the recorded announcement is continued.

When recording of the voice of the specified announcement is instructed, the control section 34 starts recording of the voice of the specified announcement (step 107). Specifically, the control unit 34 switches the selection output of the switch unit 20 to the recording unit 22 side,
The identification information corresponding to the announcement that started broadcasting is output to the DAB decoding unit 6. DAB decoding unit 6
Extracts the MPEG audio data of the announcement corresponding to the output identification information and inputs it to the audio decoding unit 10. The MPEG audio data is converted to PCM audio data by the audio decoding unit 10, further converted to an analog signal by the D / A converter 14, and recorded by the recording unit 22.

When the recording is started, the control unit 34 monitors whether or not the broadcast of the designated announcement has ended (step 108). As described above, the FIG. (0/19) relating to the announcement switching for the currently received ensemble includes the search target A
An announcement that is currently being broadcast with the sw flag is included. Therefore, when the announcement having the Asw flag as the search target is no longer included in FIG (0/19), it is determined that the announcement has been completed.

When the broadcast of the designated announcement has been completed, the control section 34 terminates the recording of the sound of the announcement to the recording section 22 (step 10).
9) The user is notified by displaying the fact on the display unit 40 (step 110). Then step 1
Returning to 01, it is monitored whether or not an instruction to reproduce the sound of the recorded announcement has been issued.

If it is instructed not to record the sound of the specified announcement but to output it from the speaker 18 (Yes in step 105), the control unit 34 determines that the sound is currently being output. The volume of the service is lowered (step 111), and the voice of the specified announcement is superimposed on the voice of the service and output (step 112). Specifically, the control unit 34 switches the selection output of the switch unit 20 to the switch unit 36 side, and outputs identification information corresponding to the announcement that has started broadcasting to the DAB decoding unit 6. The DAB decoding unit 6 extracts the MPEG audio data of the announcement corresponding to the output identification information and inputs the extracted MPEG audio data to the audio decoding unit 10. This MPEG audio data is transmitted to the PC by the audio decoding unit 10.
Is converted to M audio data, and is further converted to a D / A converter 1
The signal is converted into an analog signal by 4 and the sound of the announcement is output from the speaker 18 together with the sound of the service. Since the volume of the output voice of the service is lowered in step 111, the voice of the announcement is output at a high volume, and the voice of the service is output at a low volume.

Next, the control section 34 determines whether or not the broadcast of the announcement has ended (step 11).
3) If not finished, it is determined whether or not the audio output of the announcement has been canceled (step 1).
14). If not, step 1
Returning to 13, the monitoring of the end of the broadcast of the announcement is continued. In addition, when the broadcast of the announcement is terminated or the audio output of the announcement is canceled by the user, the control unit 34 stops the audio output of the announcement (step 115), and the service of the service that has been lowered is stopped. The volume of the voice is increased (step 116), and thereafter, the process returns to step 101 to monitor whether or not an instruction to reproduce the voice of the recorded announcement has been issued.

As described above, the DAB receiver 1 of this embodiment
Has two audio decoding units 8 and 10, even if the audio for the service is being output using one audio decoding unit 8, the announcement of the announcement is performed using the other audio decoding unit 10. A voice signal can be created, and the voice of the announcement can be output over the voice of the service or recorded in the background according to the user's instruction. For this reason, the user does not need to switch to the announcement sound that was suddenly detected while listening to the service sound, and also needs to perform complicated operations such as returning the output sound switched in this way to the original state. Therefore, operability can be improved. In addition, by recording the sound of the announcement, the designated announcement can be prevented from being missed, and at the same time, the user can listen to the sound of the recorded announcement at any time. The receiver 1 can be realized.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the voice of the service is output, and the voice of the specified announcement is output or recorded in a superimposed manner. However, other combinations are also conceivable. For example, while outputting the audio of the service, the audio of another specified service may be output or recorded overlaid, or while the audio of the announcement is being output, the audio of another specified announcement may be output. May be output or recorded. Further, contrary to the above-described embodiment, while outputting the sound of the announcement, the sound of the designated service may be output or recorded in a superimposed manner.

The procedure for retrieving a designated service and outputting or recording its voice is as follows.
Regarding the service search by the control unit 34, as described above, the FIG. (0/17) related to the program type includes the Int code indicating the type of each service. It is possible to check whether or not another service in the ensemble including the current service matches the service to be searched.

For the audio output of the service, the control section 34 sets the FIG.
By referring to 7), the service identification code SId of the service detected by the service search is obtained, and further, the F related to the service list in the ensemble is obtained.
By analyzing IG (0/2), it is determined whether or not the service detected by the search is included in the currently received ensemble. If the service is included in the currently received ensemble, the control unit 34 outputs the service identification information of the service to the DAB decoding unit 6, and the DAB decoding unit 6 outputs the MPEG of the service corresponding to the service identification information. Data is input to the audio decoding unit 10. The MPEG audio data is converted into PCM audio data by the audio decoding unit 10, further converted into an analog audio signal by the D / A converter 14, output from the speaker 18, or recorded on the recording unit 22.

In the above-described embodiment, when the announcement is recorded, the fact is displayed on the display unit 40. Instead, the fact may be notified from the speaker 18 by voice instead of displaying it. The means for notifying the user is not limited to the case of displaying.

Further, in the above-described embodiment, the DAB service is output while the audio of the specified DAB announcement is output or recorded during the audio output.
While outputting audio of each service received in AM broadcast or RDS broadcast, or outputting reproduced audio from the CD player 32, output or record the sound of the DAB service or announcement specified in advance. May be. In this case, since two systems of the audio decoding unit and the D / A converter are prepared, for example, when two programs of DAB are designated, one of the previously detected programs is converted to the audio decoding unit 8 and the D / A converter. Using the A converter 12, the audio is superimposed on audio such as FM and output from the speaker 18. If the other program is detected during the audio output, the audio decoder 10 and the D / A converter 14 are used. An embodiment in which the sound is recorded on the sound recording unit 22 is made possible.

Further, in the above-described embodiment, the decoded data output from the audio
After being converted into an analog audio signal by passing through the A converter 14, the audio signal is recorded in the recording unit 22, but is output from the audio decoding unit 10 or the DAB decoding unit 6 before being input to the audio decoding unit 10. The output data may be directly stored in various storage media such as a semiconductor memory, a hard disk, and a compact cassette. In addition, the recording unit 22 is configured to record the voice of the service,
Since the recording capacity differs greatly from the case of recording the sound of the announcement, separate recording media may be used. Also, instead of recording both the voice of the service and the voice of the announcement, only the voice of the announcement whose recording time is short may be recorded. In this case, it is preferable that the recording unit 22 be formed of a semiconductor memory, and that the digital signal be stored in the state of digital data before being input to the D / A converter 14. Further, the audio decoding units 8 and 10 may include three or more audio decoding units.

[0047]

As described above, according to the present invention, after separating a plurality of program data multiplexed into one signal,
Since the plurality of program data can be decoded in parallel, it is possible to simultaneously output the sounds of the plurality of programs. Also, by storing the decoded data of the remaining programs in the background at the same time as the output of audio or the like of any program, a plurality of programs broadcast in the same time zone can be received at the same time. In particular, if this is notified after the storing operation is completed, and the user is instructed to reproduce the program, the program audio or the like is output based on the stored decoded data. A plurality of programs broadcasted during the time zone can be output at staggered times, and both can be enjoyed without being missed. In addition, since the decoded data of one of the programs is stored in the background as described above, if a setting is made to search for a desired program without interrupting the sound and the like of the remaining programs, Each time the program is switched, complicated operations such as switching back to the original program are not required, and operability can be improved. Also, instead of storing the decoded data output from any of the encoding means and reading it out later and outputting the audio or the like of the program, the tone of a plurality of programs is output with added tones. In this case, both programs can be heard.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a DAB receiver according to an embodiment to which the present invention has been applied.

FIG. 2 is a diagram illustrating a frame structure used in a DAB receiver.

FIG. 3 is a flowchart showing an operation procedure when an announcement designated in advance is broadcast while outputting audio of a service.

[Explanation of symbols]

 Reference Signs List 1 DAB receiver 4 DAB front end unit 6 DAB decoding unit 8, 10 audio decoding unit 12, 14 D / A converter 20, 36 switch unit 22 recording unit 34 control unit 38 operation unit 40 display unit

Claims (4)

[Claims] A receiving unit that receives a signal in which a plurality of programs are multiplexed; a separating unit that separates a plurality of program data multiplexed into a signal received by the receiving unit; And a plurality of decoding means for separately decoding each of the plurality of program data obtained. 2. The apparatus according to claim 1, further comprising: decoded data storage means for storing decoded data output from any of the plurality of decoding means, wherein the decoded data storage means is connected. A multiplex broadcast receiver, wherein the operation of storing decoded data by the decoded data storage means is performed in parallel with the operation of outputting a program based on the decoded data output from the decoding means. 3. The notifying means according to claim 2, wherein a notifying means for notifying the end of the data storing operation by said decoded data storing means, and a predetermined program reproduction is instructed in response to the notification by said notifying means. When the decoded data is read from the decoded data storage unit, the program data is read out prior to the program output operation based on the decoded data output from the decoding unit to which the decoded data storage unit is not connected. A program reproducing means for performing a program output operation based on the decoded data. 4. The method according to claim 1, wherein audio output operations of a plurality of programs based on a plurality of decoded data output from the plurality of decoding means are performed in parallel.
A multiplex broadcast receiver characterized in that the sound of one of the plurality of programs is increased and the sound of the remaining programs is decreased.