JP5070979B2 - Digital broadcast receiver and digital broadcast switching method - Google Patents

Description

  The present invention relates to a digital broadcast receiver and a digital broadcast switching method.

  Patent Document 1 discloses a digital broadcast receiver that receives a digital broadcast in which video information and additional information are transmitted. This digital broadcast receiver compares program data for each channel of SDTV (Standard Definition Television), and handles these data as one channel when these program data are common, thereby enabling HDTV (High Definition Television) broadcasting to be performed by SDTV. The channel is prevented from being repeatedly selected for each channel.

Japanese Patent Laying-Open No. 2005-218131 (summary, detailed description of the invention, etc.)

  Thus, in digital broadcasting, a plurality of services using a plurality of sets of video data and audio data can be provided on one broadcasting channel. Therefore, broadcasters can provide various services by freely combining video and audio.

  On the other hand, the provision of a plurality of services may cause a situation where it is difficult for a user who receives a broadcast to understand. That is, for example, in a conventional analog broadcast, only one sound can be multiplexed and switched in one broadcast. This audio multiplexing technique is expected to continue to be used in digital broadcasting.

  Therefore, for example, in one digital broadcast, a plurality of services with common video and different voices are provided, and in one digital broadcast, a service in which a plurality of sounds are multiplexed is provided. The user has to do different operations.

  That is, the user must perform a service switching operation in the former case and a voice switching operation in the latter case. If these differences cannot be understood, the user, for example, in the former case, only the audio is switched by the service, and the video does not change even when the service is switched, even though the switching is normally performed according to the operation. You will feel uncomfortable.

  The present invention provides a digital broadcast receiver and a digital broadcast capable of switching between audio and video with the same usability as when receiving a conventional analog broadcast without understanding a combination of services freely set by a broadcaster. The purpose is to obtain a switching method.

  The digital broadcast receiver according to the present invention receives broadcast waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel. The digital broadcast receiver includes a determination unit that determines whether or not a plurality of services that use common video data are defined as a service configuration in the broadcast channel, and an audio switching instruction that instructs audio switching. And a plurality of services using the common video data based on the audio switching instruction by the audio switching instruction means when it is determined that the plurality of services using the common video data are defined by the means and the determining means Voice switching means for switching between services.

  The digital broadcast receiver according to the present invention has the following features in addition to the above-described configuration of the invention. That is, the digital broadcast receiver further includes a voice switching button as voice switching instruction means. Then, the voice switching means switches the voice within the service being received based on the operation of the voice switch button, and switches the service among a plurality of services that share the received service and the video data. And execute.

  The digital broadcast receiver according to the present invention has the following features in addition to the components of the above-described invention. In other words, the digital broadcast receiver further determines that a plurality of services using the common video data are defined in the service switching operation when the determination unit determines that a plurality of services using the common video data are defined. Service switching means for setting one of the services to be a service switching target.

  The digital broadcast receiver according to the present invention has the following features in addition to the components of the above-described invention. That is, the digital broadcast receiver further displays that the service switching is available when the judging means does not judge that a plurality of services using the common video data are defined, and displays the common video. When it is determined that a plurality of services using data are defined, display instruction means for displaying that voice switching is possible is provided.

  The digital broadcast receiver according to the present invention has the following features in addition to the components of the above-described invention. That is, the determination means uses a plurality of common video data when the identification information of the video data designated in each service matches in a plurality of services and / or when the program information of a plurality of services matches. Is determined to exist.

  Another digital broadcast receiver according to the present invention receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel. And this digital broadcast receiver uses the common audio data by the judging means for judging whether or not a plurality of services using the common audio data are defined as the service configuration in the broadcast channel. Video switching means for switching services among a plurality of services using common audio data based on a video switching operation.

  The digital broadcast switching method according to the present invention is in a digital broadcast receiver that receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel. In this digital broadcast switching method, a step of determining whether or not a plurality of services using common video data is defined as a service configuration in the broadcast channel, and the common video data is used by the steps. When it is determined that a plurality of services are defined, the step of switching the services among the plurality of services using the common video data based on the voice switching instruction by the voice switching instruction means for instructing the voice switching. And having.

  Another digital broadcast switching method according to the present invention is in a digital broadcast receiver that receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel. In another digital broadcasting switching method, a step of determining whether or not a plurality of services using common audio data are defined as a service configuration in a broadcast channel, and the common audio data is determined by the steps. When it is determined that a plurality of services to be used are defined, a step of switching the services among a plurality of services using common audio data based on a video switching operation is included.

  In the present invention, it is possible to switch between audio and video with the same usability as when receiving a conventional analog broadcast without understanding the combination of services freely set by the broadcaster.

  Hereinafter, a digital broadcast receiver and a digital broadcast switching method according to an embodiment of the present invention will be described with reference to the drawings. The digital broadcast switching method will be described as a part of the operation of the digital broadcast receiver.

  FIG. 1 is a block diagram showing a digital broadcast receiver 1 according to an embodiment of the present invention. The digital broadcast receiver 1 receives and outputs digital broadcast broadcast waves for each broadcast channel.

  For example, ISDB (Integrated Services Digital Broadcasting) system (Japanese system), ATSC (Advanced Television Systems Committee) system (American system), and DVB-T (Digital Video) system. European system).

  The ISDB system includes an ISDB-S system for satellite broadcasting, an ISDB-T system for digital terrestrial broadcasting, an ISDB-TSB system for digital terrestrial audio broadcasting, and an ISDB-C system for cable television.

  With these digital broadcast radio waves, unlike conventional analog broadcasts, it is possible to provide a plurality of services for each broadcast channel. 2-5 is explanatory drawing which shows the structural example of the service in one broadcast channel.

  FIG. 2 is a diagram showing a content configuration image when a single service is provided by a set of video data 51 and audio data 52 in one broadcast channel. The broadcast channel in FIG. 2 has one PMT (Program Map Table) 41. The PMT 41 has a PID (Packet ID) of a TS (Transport Stream) packet that transmits video data 51 and a PID of a TS packet that transmits audio data 52.

  The PMT 41 constitutes PSI data together with a PAT (Program Association Table), CAT (Conditional Access Table), NIT (Network Information Table), etc., not shown. PSI data is periodically transmitted in broadcast radio waves.

  FIG. 3 is a diagram showing a content configuration image when a single service is provided by one video data 51 and two audio data 52 in one broadcast channel. One PMT 41 in FIG. 3 has a PID of video data 51 and a PID of two audio data 52.

  FIG. 4 is a diagram showing a content configuration image in the case of providing three services using three sets of video data 51 and audio data 52 in one broadcast channel. Each PMT 41 of FIG. 4 has a PID of each set of video data 51 and a PID of audio data 52.

  FIG. 5 is a diagram showing a content configuration image in the case of providing three services using one video data 51 and three audio data 52 in one broadcast channel. Each PMT 41 in FIG. 5 has a common PID of one video data 51 and different PIDs of audio data 52 different from each other.

  As shown in FIGS. 2 to 5, a broadcaster can provide a wide variety of services in which video and audio are freely combined using one allocated broadcast channel. The broadcaster can change the combination of services according to program organization, video image quality, etc., and broadcast. For example, a high-quality service can be provided in multiple languages using the content configuration shown in FIG. 5, or three services can be provided simultaneously using the content configuration shown in FIG. Broadcasters can provide a variety of services by switching these content configurations.

  Note that the number of PMTs 41 in one broadcast channel matches the number of services provided thereby. The number of PIDs of video data 51 in each PMT 41 indicates the number of video data 51 usable in the service, and the number of PIDs of audio data 52 in each PMT 41 is the number of audio data 52 available in the service. The number will be shown.

  As shown in FIG. 1, a digital broadcast receiver 1 that receives such digital broadcast radio waves includes a reception antenna 11, a tuner unit 12, a demodulation unit 13, a demultiplexer unit 14, an AV (Audio Visual) decoder unit 15, An OSD (On Screen Display) unit 16, a video output unit 17, a DA (Digital to Analog) unit 18, an audio output unit 19, and the like are included.

  The receiving antenna 11 receives digital broadcast radio waves. The tuner unit 12 converts a signal received by the receiving antenna 11 into an intermediate frequency signal. The demodulator 13 demodulates the intermediate frequency signal from a signal that is divided and multiplexed by, for example, an OFDM (Orthogonal Frequency Division Multiplex) method, and generates a baseband signal of one broadcast channel. The demultiplexer unit 14 extracts video data 51 and audio data 52 of one service multiplexed on the broadcast radio wave from the baseband signal. The AV decoder unit 15 generates a video signal from the extracted video data 51 and generates an audio signal from the extracted audio data 52.

  The OSD unit 16 outputs the video signal generated by the AV decoder unit 15 to the video output unit 17 as it is, or outputs a video signal obtained by superimposing the OSD screen on the video signal generated by the AV decoder unit 15 to the video output unit 17. Or output. The DA unit 18 outputs the audio signal generated by the AV decoder unit 15 to the audio output unit 19.

  Thereby, the video of the service selected by the demultiplexer unit 14 is displayed on a high-definition television receiver (not shown) connected to the video output unit 17, and from a speaker system (not shown) connected to the audio output unit 19. The voice of the service selected by the demultiplexer unit 14 is output.

  The digital broadcast receiver 1 of FIG. 1 further includes an input device 21, a CPU (Central Processing Unit) 22, a memory 23, and the like.

  The input device 21 includes, for example, a channel switching button 31 that also functions as a service switching button, a voice switching button 32 that is an example of voice switching instruction means, and the like. The channel switching button 31 and the audio switching button 32 are arranged on the remote control unit for the digital broadcast receiver 1 even if they are arranged on the front panel (not shown) of the digital broadcast receiver 1. Also good. In addition to the voice switching button 32, for example, a voice switching instruction means including a voice recognizable microphone and the CPU 22 may be employed.

  The CPU 22 reads and executes a program (not shown) stored in the memory 23. Thereby, functions such as a control unit are realized in the CPU 22. The control unit functions as a determination unit, a voice switching unit, a service switching unit, and a display instruction unit. For example, based on operation data input from the input device 21 according to a button operation, the tuner unit 12, demodulation Control unit 13, demultiplexer unit 14, AV decoder unit 15, OSD unit 16, DA unit 18 and the like.

  Next, the operation of the digital broadcast receiver 1 having the above configuration will be described. In the following, an OSD display operation, a sound switching operation, and a service switching operation (channel switching operation) in a state where a predetermined one broadcast channel is received will be mainly described in order.

  FIG. 6 is a flowchart showing the flow of the OSD process executed by the CPU (control unit) 22 in FIG. The CPU 22 executes the OSD process of FIG. 6 when, for example, the reception of one broadcast channel is started after the channel switch button 31 is operated.

  In the OSD process, the CPU 22 first determines whether or not voice switching within the service being received is possible (step ST1). The CPU 22 uses a plurality of audio data 52 when the service being received is an audio multiplex broadcast, or when PIDs of a plurality of audio data 52 are registered in the PMT 41 of the service being received. It is judged that.

  When the voice switching within the service being received is possible, the CPU 22 stores in the memory 23 that the voice switching within the service is possible (step ST2). Conversely, if the service being received is not audio multiplex broadcasting and does not use a plurality of audio data 52, the CPU 22 stores in the memory 23 that in-service audio switching is impossible (step ST3). .

  Thereafter, the CPU 22 determines whether or not a plurality of services are received (step ST4). If the broadcast radio wave being received is for a single service, the CPU 22 determines that a plurality of services have not been received. In this case, the CPU 22 displays on the OSD unit 16 that service switching is impossible (step ST5). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  If the broadcast radio wave being received is for a plurality of services, the CPU 22 determines that a plurality of services are being received. In this case, the CPU 22 further determines whether there is any service other than the service being received that specifies the same video as the service being played (step ST6). For example, when there is no PMT 41 of another service having the same PID as the video of the service being played back, the CPU 22 determines that there is no one that specifies the same video as the service being played. In this case, the CPU 22 displays on the OSD unit 16 that service switching is possible (step ST7). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  If there is a PMT 41 of another service having the same PID as the video of the service being reproduced, the CPU 22 stores in the memory 23 that the voice can be switched by switching the service (step ST8).

  Thereafter, the CPU 22 determines whether or not voice switching is possible (step ST9). The CPU 22 refers to the memory 23, and if the memory 23 stores that the voice can be switched within the service, or if the voice is switched that can be switched by switching the service, the voice It is determined that switching is possible.

  If it is determined that voice switching is possible, the CPU 22 displays on the OSD unit 16 that voice switching is possible (step ST10). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  If it is determined that voice switching is not possible, the CPU 22 displays on the OSD unit 16 that voice switching is not possible (step ST11). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  Through the OSD process described above, when there is another service (PMT 41) that uses the same video as the service being received, the digital broadcast receiver 1 switches the sound to a high-definition television receiver (not shown) connected thereto. When the other service (PMT 41) uses a video different from the service being received, the service switching is displayed.

  FIG. 7 is a flowchart showing the flow of voice switching processing executed by the CPU (control unit) 22 in FIG. For example, when the voice switching button 32 is operated, the CPU 22 executes the voice switching process of FIG. 7 (step ST21).

  In the voice switching process, the CPU 22 first determines whether or not voice switching is possible within the service being received (step ST22). For example, when a plurality of voice PIDs are designated in the PMT 41 of the receiving service, or when the designated voice data 52 is voice-multiplexed, the CPU 22 can switch voices in the receiving service. It is judged that.

  If it is determined that voice switching is possible within the service being received, the CPU 22 further determines whether or not voice switching by service switching is possible (step ST23). For example, when the receiving broadcast channel provides a plurality of services and there is another service that specifies the same video PID as the receiving service, the CPU 22 can switch the sound by switching the service. It is judged that.

  If it is determined that the voice can be switched within the service being received, and further, it is determined that the voice can be switched by switching the service, the CPU 22 determines the order of switching the voice between them, and the memory 23 (step ST24). For example, the CPU 22 first switches to multiplexed audio within the service being received, then switches to other audio data 52 within the service being received, and further determines the order of switching to another service that specifies the PID of the same video. And stored in the memory 23.

  Thereafter, for example, every time the voice switching button 32 is operated, the CPU 22 performs control to switch the voice to be reproduced using the switching order stored in the memory 23 (step ST25). For example, when switching to multiplexed audio of the audio data 52 being received, the CPU 22 instructs the AV decoder unit 15 and the DA unit 18 to switch between multiplexed audio. When switching to other audio data 52 in the service being received, the CPU 22 instructs the demultiplexer unit 14 to extract other audio data 52 registered in the PMT 41 of the service being reproduced. When switching to another service, the CPU 22 instructs the demultiplexer unit 14 to extract other audio data 52 registered in the PMT 41 of the other service.

  If it is determined that voice switching is not possible due to service switching after determining that voice switching is possible within the service being received, the CPU 22 determines the order of switching voice within the service being received, and the memory 23 (Step ST26). For example, the CPU 22 first determines the order of switching to the multiplexed voice of the voice data 52 being received, and then switches to the other voice data 52 in the service being received, and saves it in the memory 23. Thereafter, for example, every time the voice switching button 32 is operated, the CPU 22 executes control to switch the voice to be reproduced using the switching order stored in the memory 23 (step ST27).

  If it is determined in step ST22 that voice switching is not possible in the service being received, the CPU 22 further determines whether or not voice switching by service switching is possible (step ST28). If it is determined that voice switching is not possible in the service being received and then it is determined that voice switching by service switching is possible, the CPU 22 determines the order of switching voices by service and saves it in the memory 23. (Step ST29). Thereafter, for example, every time the voice switching button 32 is operated, the CPU 22 executes control for switching the voice to be reproduced using the switching order stored in the memory 23 (step ST30).

  If it is determined that voice switching is not possible due to service switching after determining that voice switching is not possible within the service being received, the CPU 22 does not perform voice switching control on the OSD unit 16 without performing voice switching control. It is displayed that it is possible (steps ST31 and ST32). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  With the above audio switching process, the digital broadcast receiver 1 executes service switching based on an operation of the audio switching button 32 or the like when the audio can be switched by switching the service.

  FIG. 8 is a flowchart showing a flow of service switching processing (channel switching processing) executed by the CPU (control unit) 22 in FIG. For example, when the channel switching button 31 (service switching button) is operated, the CPU 22 executes the service switching process of FIG. 8 (step ST41).

  In the service switching process (channel switching process), the CPU 22 first selects the next channel (including service) according to the operation of the channel switching button 31 (step ST42). In digital broadcasting, channel configuration (including service configuration) can be determined from PSI data. For example, when channel up is operated by the channel switching button 31, the CPU 22 selects the next program number after the program number of the service being received as the next service using the PSI data, and the channel down button 31 selects the channel down. Is operated, the PSI data is used to select the program number immediately before the program number of the receiving service as the next service. By this selection, another service in the same broadcast channel or a service of another broadcast channel is selected as the next channel.

  After selecting the next channel, the CPU 22 determines whether or not the video of the selected channel is the same as the video being played back (step ST43). For example, when the PID of the video of the service corresponding to the selected channel matches the PID of the video of the service being played back, the CPU 22 determines that the video of the selected channel and the video being played back are the same. In this case, the CPU 22 further selects the next channel (step ST42). The CPU 22 repeats the next channel selection process (step ST42) until the videos do not match (until determined as No in step ST43).

  When a video channel different from the currently playing service is selected, the CPU 22 executes a process of switching to that channel (service) (step ST44). For example, if the service of the selected channel is in the same broadcast channel as the service being played, the CPU 22 extracts the other video data 51 and other audio data 52 registered in the PMT 41 of the selected channel. It instructs the multiplexer unit 14. In addition to this, for example, when the service of the selected channel is a service of another broadcast channel, the CPU 22 receives the selected broadcast channel and receives the service of the selected channel so as to receive the service of the selected channel. It instructs the demultiplexer unit 14, AV decoder unit 15, and DA unit 18.

  Through the service switching process (channel switching process) described above, the digital broadcast receiver 1 performs service switching so that the video is switched based on the operation of the channel switching button 31 (service switching button).

  As described above, the digital broadcast receiver 1 according to the present embodiment performs the voice switching operation of FIG. 7 without using the service switching operation of FIG. 8 for a plurality of services in which only the voice is switched by the service switching operation. Can be switched. Therefore, the user understands, for example, the difference between a case where a plurality of services with common video and different sounds are provided and a service in which a plurality of sounds are multiplexed are provided in one digital broadcast. Without having to do so, it is possible to switch between services that share a video by an audio switching operation. In other words, even if the broadcaster does not understand the combination of services freely set by the broadcaster, the user can switch the sound between different services by the same sound switching operation as when receiving a conventional analog broadcast. It is.

  In addition, the CPU (control unit) 22 of the digital broadcast receiver 1 according to this embodiment performs audio in the receiving service according to the operation of the audio switching button 32 as shown in steps ST21 to ST25 in FIG. And switching of services among a plurality of services that commonly use the video data 51 of the service being received. Therefore, the user can perform a single operation with the voice switching button 32 without being aware of whether a plurality of switchable voices are specified in the service being received or separately specified in the plurality of services. These voices can be switched. Even if the user does not understand the combination of services freely set by the broadcaster, the user can operate the voice switching button 32 so that a plurality of voices in one service and a plurality of voices in different services Can be switched.

  Further, in the digital broadcast receiver 1 of this embodiment, the CPU (control unit) 22 cannot switch audio within the service being received, and uses the service being received and the video data 51 in common. If the service cannot be switched among the plurality of services, the voice is not switched even if the voice switch button 32 is operated (step ST31 in FIG. 7). Therefore, the user can determine that there is no switchable voice by operating the voice switching button 32 without understanding the combination of services freely set by the broadcaster.

  In the digital broadcast receiver 1 of this embodiment, the CPU (control unit) 22 switches channels (services) when it is determined that a plurality of services using the common video data 51 are defined. In operation, one of a plurality of services using the common video data 51 is set as a channel (service) switching target (steps ST42 and ST43 in FIG. 8). Therefore, there is no case where only the voice is switched in spite of the service switching operation. In the channel (service) switching operation, the video is always switched.

  For this reason, for example, if only the sound is switched due to a channel (service) switching operation, for example, the user may feel uncomfortable with the switching, or may mistakenly recognize that the switching has not been made. The problem no longer occurs. In addition, since the service switching in which only the audio is switched is realized only by the audio switching operation (FIG. 7), the user does not feel uncomfortable in the video and audio switching processing.

  In the digital broadcast receiver 1 according to this embodiment, the CPU (control unit) 22 can use service switching when it is not determined that a plurality of services using the common video data 51 are defined. It is displayed (step ST7 in FIG. 6). Further, when it is determined that a plurality of services using the common video data 51 are defined, the CPU (control unit) 22 displays that the audio can be switched (step ST10 in FIG. 6). . Based on these displays, the user can know that the service can be switched and the voice can be switched.

  In the digital broadcast receiver 1 of this embodiment, the CPU (control unit) 22 uses a common video when the PID (identification information) of the video data 51 specified in each service matches in a plurality of services. It is determined that there are a plurality of services using data 51 (step ST6 in FIG. 6, steps ST23 and ST28 in FIG. 7, and step ST43 in FIG. 8). Accordingly, the CPU (control unit) 22 uses a plurality of services using the common video data 51 among a plurality of services provided by the broadcast channel based only on information on received channels (information on PSI data). Can be determined.

  The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications and changes can be made without departing from the scope of the invention. is there.

  In the above embodiment, the CPU (control unit) 22 of the digital broadcast receiver 1 determines the presence / absence of audio switching within the same service and the presence / absence of a plurality of services sharing video in the OSD process of FIG. Even in the audio switching process of FIG. 7, it is determined whether or not there is audio switching within the same service and whether or not there are a plurality of services that share video. In addition to this, for example, the CPU (control unit) 22 may determine whether or not the voice switching by the OSD process of FIG. 6 is registered in the memory 23 in the voice switching process of FIG. .

  In the above embodiment, the CPU (control unit) 22 of the digital broadcast receiver 1 uses the common video data when the PID (identification information) of the video matches in a plurality of services in the broadcast channel being received. It is determined that there are a plurality of services using 51 (step 6 in FIG. 6). In addition, for example, the CPU (control unit) 22 may determine that there are a plurality of services using the common video data 51 when the program information of the plurality of services match.

  FIG. 9 is a flowchart showing a flow of a modification of the OSD process of FIG. If it is determined in step ST6 in FIG. 9 that the PIDs (identification information) of the images of the plurality of services in the broadcast channel being received match, the CPU (control unit) 22 further displays the program names (program information) of the plurality of services. ) Are matched (step ST51). If it is determined that the program names of a plurality of services match, the CPU 22 stores in the memory 23 that the audio can be switched by switching the service (step ST8). Even if the PIDs of the videos of a plurality of services match, if the program names do not match, the CPU 22 causes the OSD unit 16 to display that service switching is possible (step ST7).

  In the above embodiment, the digital broadcast receiver 1 executes the OSD process of FIG. 6 when switching channels (services). In addition to this, for example, the digital broadcast receiver 1 does not have to execute the OSD process of FIG. 6 when switching channels (services).

  FIG. 10 is a flowchart showing the flow of a modification of the voice switching process of FIG. The voice switching process of FIG. 10 can be suitably used when the OSD process is not executed, and does not require the memory 23 for storing that the voice data 52 can be switched.

  That is, in FIG. 10, the CPU 22 first determines whether or not the service being received is one that uses audio multiplex broadcasting or a plurality of audio data 52 (step ST61). When the service being received is an audio multiplex broadcast, or when using a plurality of audio data 52, the CPU 22 refers to the PMT 41 of the service being received and switches the switching order specified in the order in the PMT 41. The order of the sound being reproduced in is determined. If the order of the sound being played is not the last in the switching order at PMT 41 (No in step ST62), CPU 22 switches to the next sound in the switching order of PMT 41 (step ST63).

  If the service being received is not an audio multiplex broadcast and does not use a plurality of audio data 52, the CPU 22 determines whether or not a plurality of services are received (step ST64). On the other hand, when the order of the sound being reproduced is the last in the switching order of the PMT 41, the CPU 22 determines whether or not a plurality of services are received (step ST64).

  If a plurality of services are not received, the CPU 22 causes the OSD unit 16 to display that the service cannot be switched without switching the sound to be played back (steps ST65 and ST66). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  If a plurality of services are received, CPU 22 further determines whether or not the PID of the video of the service other than being played is the same as the PID of the video of the service being played (step ST67). Then, when there is no other service that designates the PID of the same video, the CPU 22 displays on the OSD unit 16 that the service cannot be switched without switching the audio to be played back (steps ST65 and ST66).

  If there is another service specifying the PID of the same video, the CPU 22 further determines whether or not the program names (program information) of the plurality of services match (step ST68). When there is no other service with the same program name (program information), the CPU 22 displays that the service switching is impossible on the OSD unit 16 without switching the sound to be played back (steps ST65 and ST66). .

  When there is another service with the same program name (program information), the CPU 22 refers to the PSI data and determines the order of the service being played back in the service order specified by the sequence in the PSI data ( Step ST69). If the order of the service being played is not the last in the switching order in the PMT 41, the CPU 22 switches to the next service in the service order in the PSI data (step ST70).

  When the order of the service being played is the last in the service order in the PSI data, the CPU 22 first voices the first service in the service order in the PSI data (first voice in the PMT 41 of the service = default (Step ST71).

  In the above embodiment, when there are a plurality of services having the same video and different sounds, the plurality of services are switched by the voice switching process, and switching between the services is performed in the service switching process. Is not made. In addition to this, for example, a plurality of services having the same video and different audio may be switched by the audio switching process, and may be switched by the service switching process.

  In the above embodiment, the channel switching button 31 also functions as a service switching button. In addition to this, for example, the digital broadcast receiver 1 may have a service switching button (not shown) separately from the channel switching button 31. In this modification, for example, when there are a plurality of services having common audio and different images, the plurality of services may be switched only by a service switching button (not shown).

  FIG. 11 is a flowchart showing the flow of video switching processing executed by the CPU (control unit) 22 of the digital broadcast receiver 1. In this case, the CPU 22 functions as a determination unit, a video switching unit, a service switching unit, and a display instruction unit, and executes the video switching process of FIG. 11 when, for example, a service switching button (not shown) is operated.

  In the video switching process, the CPU (control unit) 22 of the digital broadcast receiver 1 can first switch the video based on whether or not a plurality of video data 51 (its PID) is included in the reception channel. (Step ST81).

  When determining that video switching is not possible in the receiving service, the CPU 22 displays that the video switching is impossible on the OSD unit 16 without performing control to switch the video (steps ST82 and ST83). The OSD unit 16 superimposes the OSD screen displaying the fact on the video signal generated by the AV decoder unit 15 and outputs it.

  When determining that the video switching is possible in the service being received, the CPU 22 refers to the PMT 41 of the service being received, and determines the order of the video being played back in the switching order specified by the arrangement in the PMT 41. . If the order of the video being reproduced is not the last in the switching order of the PMT 41 (No in step ST84), the CPU 22 switches to the next video in the switching order of the PMT 41 (step ST85).

  When the order of the video being reproduced is the last in the switching order in the PMT 41 (Yes in step ST84), the CPU 22 further reproduces the voice (PID) of the service other than being reproduced. It is determined whether or not it is the same as the service voice (PID) (step ST86). If there is no other service that designates the same sound (PID), the CPU 22 displays on the OSD unit 16 that the service cannot be switched without switching the video to be played back (steps ST82 and ST83). .

  When there is another service that designates the same voice (its PID), the CPU 22 further refers to the PSI data, and determines the order of the service being played back in the service order designated by the arrangement in the PSI data. . If the order of the service being played is not the last in the switching order in the PSI data (No in step ST87), the CPU 22 moves to the next service (video) in the service switching order in the PSI data. Switching (step ST88).

  When the order of the service being reproduced is the last in the service switching order in the PSI data (Yes in step ST87), the CPU 22 first video of the first service in the service switching order in the PSI data Switch to (the first video at the PMT 41 of the service = default video) (step ST89).

  With the above video switching process, the digital broadcast receiver 1 performs service switching based on an operation of a service switching button different from the channel switching button 31 when video switching by service switching is possible. .

  In the embodiment described above, video is output from the high-definition television receiver connected to the digital broadcast receiver 1, and sound is output from the speaker system connected to the digital broadcast receiver 1. In addition, for example, the digital broadcast receiver 1 may be provided with a liquid crystal display device, a speaker, and the like, and the digital broadcast receiver 1 may output video and audio. Furthermore, for example, the digital broadcast receiver 1 may be integrated with a liquid crystal display device or the like and installed in a moving body such as an automobile.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used in a digital broadcast receiver that receives broadcast radio waves in which a broadcaster can freely set a combination of services.

FIG. 1 is a block diagram showing a digital broadcast receiver according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a content configuration image of a broadcast channel that provides a single service using a set of video data and audio data. FIG. 3 is a diagram showing a content configuration image of a broadcast channel that provides a single service using one video data and two audio data. FIG. 4 is a diagram showing a content configuration image of a broadcast channel that provides three services using three sets of video data and audio data. FIG. 5 is a diagram showing a content configuration image of a broadcast channel that provides three services using one video data and three audio data. FIG. 6 is a flowchart showing a flow of OSD processing executed by the CPU (control unit) in FIG. FIG. 7 is a flowchart showing the flow of voice switching processing executed by the CPU (control unit) in FIG. FIG. 8 is a flowchart showing a flow of service switching processing (channel switching processing) executed by the CPU (control unit) in FIG. FIG. 9 is a flowchart showing a flow of a modification of the OSD process of FIG. FIG. 10 is a flowchart showing the flow of a modification of the voice switching process of FIG. FIG. 11 is a flowchart showing the flow of video switching processing executed by the CPU (control unit) of the digital broadcast receiver.

Explanation of symbols

1 Digital broadcast receiver 22 CPU (control unit, determination means, voice switching means, service switching means, display instruction means, video switching means)
32 Voice switching button (voice switching instruction means)

Claims (8)

In a digital broadcast receiver that receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel,
Determining means for determining whether or not a plurality of services using common video data are defined as the service configuration in the broadcast channel;
Voice switching instruction means for instructing voice switching;
When it is determined by the determining means that a plurality of services using the common video data are defined, a plurality of services using the common video data based on the audio switching instruction by the audio switching instruction means Voice switching means for switching services between
A digital broadcast receiver comprising: The voice switching instruction means is a voice switching button,
The voice switching means switches the voice within the service being received based on the operation of the voice switch button, and switches the service among a plurality of services that share the received service and video data. And performing
The digital broadcast receiver according to claim 1.   When it is determined by the determination means that a plurality of services using the common video data are defined, one of the plurality of services using the common video data is serviced in the service switching operation. 3. The digital broadcast receiver according to claim 1, further comprising service switching means to be switched.   If the determination means does not determine that a plurality of services are provided and a plurality of services using the common video data are defined, the fact that the service switching is available is displayed, and the common video data is displayed. 4. A display instructing means for displaying that voice switching is possible when it is determined that a plurality of services that use the service are defined. The digital broadcast receiver described.   The determination means uses a plurality of common video data when the identification information of the video data specified in each service matches in a plurality of services and / or when program information of a plurality of services matches. 5. The digital broadcast receiver according to claim 1, wherein the service is determined to exist. In a digital broadcast receiver that receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel,
Determining means for determining whether or not a plurality of services using common audio data are defined as the service configuration in the broadcast channel;
When it is determined by the determination means that a plurality of services that use common audio data are defined, the services are switched among the plurality of services that use the common audio data based on a video switching operation. Video switching means;
A digital broadcast receiver comprising: A digital broadcast switching method in a digital broadcast receiver that receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel,
Determining whether or not a plurality of services that use common video data are defined as service configurations in the broadcast channel;
If it is determined that a plurality of services using the common video data are defined in the above step, the common video data is used based on the voice switching instruction by the voice switching instruction means for instructing the voice switching. Switching between multiple services that perform,
A method for switching between digital broadcasts. A digital broadcast switching method in a digital broadcast receiver that receives broadcast radio waves capable of providing a plurality of services using a plurality of sets of video data and audio data in one broadcast channel,
Determining whether a plurality of services using common audio data are defined as service configurations in the broadcast channel; and
If it is determined that a plurality of services using the common audio data is defined in the step, a step of switching the services among the plurality of services using the common audio data based on a video switching operation. When,
A method for switching between digital broadcasts.

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