JP2000138877A - Digital broadcast transmitter and receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent video/audio data from being disturbed due to changeover of the resolution/quality of the video/audio data, when receiving a digital broadcast by detecting identification information from digital information and performing non-display of a video image by the video data for a prescribed period, when different identification information is detected. SOLUTION: Identification information is detected from digital information and non-display of a video image by video data is controller for a prescribed period, when different identification information is detected. In this receiver, when a mode detection section 141 detects a received display/audio mode after a mode storage section 131 stores a display/audio mode, an analysis control section 14 reads the stored display/audio mode. When the read display/audio mode differs from the received display/audio mode, the analysis control section 14 controls an OSD compositing section 16 and a video/audio mute section, 17 so as to prevent disturbed display/output of a video and audio display, due to a decoded video/audio signal outputted from an output terminal 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video apparatus for transmitting and receiving digital broadcasts and the like, and more particularly to a digital broadcast transmitting apparatus and a receiving apparatus for controlling a screen display based on input stream information.

[0002]

2. Description of the Related Art MPEG2 (Moving Picture Expert Group 2)
For video profiles and levels, for example, ISO / IC
It is described in the specification of E 13818-2. For audio, see MPEG-1 Audio (Moving Picture Experts Group 1A
udio) or MPEG-2 AAC (MPEG-2 Advanced Audio Coding)
About, for example, the specifications of ISO / IEC 11172-3, ISO / I
It is described in the specification of EC13818-7.

FIG. 1 is a block diagram showing an example of a functional configuration of a conventional digital broadcast receiving apparatus. In FIG.
The conventional digital broadcast receiving apparatus 200 includes an input terminal 101 for digital information in which some video / audio / data are multiplexed and modulated, a receiving unit 11, and a packet separating unit 12.
, Memory unit 13, analysis control unit 14, decoding unit 15
, An OSD synthesizing unit 16 and an output terminal 102 for outputting an output signal from the OSD synthesizing unit 16.

[0004] The analysis control unit 14 analyzes the received information to control each unit and creates OSD data.
Note that OSD is On Screen Display.

[0005] The receiving unit 11 corrects an error generated during demodulation or transmission.

The packet separation unit 12 selectively extracts a desired video / audio / data signal from the multiplexed signal.

[0007] The memory unit 13 stores program information and the like.

[0008] The decoding unit 15 decodes the encoded signal.

The OSD synthesizing unit 16 synthesizes the OSD data and the decoded video signal.

This conventional digital broadcast receiving apparatus 200
In the following, an operation example when receiving a digital broadcast will be described.

In a conventional digital broadcast receiving apparatus 200, digital information in which a plurality of pieces of information are multiplexed is input to the input terminal 101, the receiving section 11 demodulates a digital signal, and converts the original bit stream. obtain. The digital information includes some video / audio / data and some control information, which are multiplexed, modulated, and transmitted. The control information includes information that associates the number of the channel being broadcast with the identification number of video / audio / data, information on the reception frequency of each channel, and program information such as a program name and program contents. The digital broadcast receiving apparatus 200 uses the information when selecting a channel.

When receiving a channel selected by the user, the analysis control unit 14 controls the packet separation unit 12 to obtain information on the selected channel from the input digital information. The packet separation unit 12 separates specified video / audio / data and control information from multiplexed and input digital information.

The separated data and control information are stored in the memory unit 13. Also, separate video /
The audio is decoded by the decoding unit 15 into the original video / audio signal. The decoded video is combined with the OSD data by the OSD combining unit 16 as necessary, and is output to an external display device, for example, a monitor or the like via the output terminal 102. The decoded audio is output to an external output device, for example, a speaker or the like via the output terminal 102.

In a multi-channel broadcast, an electronic program guide (EPG: Electro Program) is used as a means for simplifying channel selection.
nic Program Guide), which is displayed on the screen using, for example, an OSD signal. The EPG is a list of currently broadcasted programs, programs to be broadcasted in the future, and the like. The user can receive a program without worrying about the channel number by selecting the displayed program. When a program scheduled to be broadcast in the future is selected, viewing reservation can be made.

When displaying the EPG, the analysis control unit 14 controls the packet separation unit 12 to acquire the program information from the input digital information, and stores the program information in the memory unit 13 as necessary. Information is read, EPG data is created based on the obtained program information, and output to the external output device via the output terminal 102. When the EPG is displayed by OSD, the EPG data is converted into an OSD signal, transmitted to the OSD synthesizing unit 16 and synthesized with the decoded video to be output to the output terminal 10.
2 to the external output device. In this way, a screen in which the OSD signal is combined with the video signal is displayed. When selecting a channel from the EPG, the analysis control unit 14
The information about the program selected by the user is stored in the memory unit 13.
Or from the input digital information, and controls the packet separation unit 12 to separate the corresponding video / audio / data. The separated video and audio are decoded by the decoding unit 15 and output to the external display device or the external output device via the output terminal 102. Thereby, the program selected by the user is broadcast.

As described above, in the conventional digital broadcast receiving apparatus 200, desired video / audio / data is selected from several input video / audio / data and displayed based on the control information. Then, the program selected by the user is displayed.

[0017]

In the above-mentioned conventional digital broadcast receiving apparatus, only consideration is given to receiving a video bit stream having the same resolution. For example,
On the same channel, a high-resolution MP @ HL (Main Profile at Main Level) video stream from the standard resolution MP @ ML (Main Profile at Main Level)
Switching to a video bitstream of Profile at High Level and vice versa is not considered.

In the above-described conventional digital broadcast receiving apparatus, for example, for each scene,
When switching between a standard resolution video bit stream and a high resolution video bit stream occurs for each program, the video may be disturbed due to a difference in the number of pixels per frame and the like, and for the user, the switching may not be possible. When
A sense of incongruity occurs. Although the above description has been made with reference to video, the following description will be given with respect to audio.

In the above-described conventional digital broadcast receiving apparatus, only reception of the same-quality audio bit stream is considered for audio as well as video. For example, on the same channel, from a standard-quality MPEG-1 Audio audio bit stream specified by MPEG-1,
Switching to a high-quality MPEG-2 AAC audio bit stream specified by MPEG-2 and vice versa is not considered.

In the above-mentioned conventional digital broadcast receiving apparatus, for example, for each scene,
For each program, if switching occurs between a standard-quality audio bit stream and a high-quality audio bit stream, the audio will also be disturbed due to differences in coding rates and the like when encoding the audio bit stream, At the time of switching, the user feels strange.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to prevent the occurrence of a disturbance when the resolution / quality of the video / audio is switched and the video / audio is disturbed when receiving a digital broadcast.

It is a further object of the present invention to display the fact that the resolution / quality of video / audio has been switched so that the user can view the program without feeling uncomfortable.

[0023]

In order to achieve the above object, a digital broadcast receiving apparatus according to the present invention comprises identification information detecting means for detecting, from received digital information, identification information of a video to be displayed or audio to be output. And the video transmitted by the identification information storage means for storing the identification information.
By sequentially comparing the identification information related to the audio and controlling the video non-display means or the audio mute means by the control means according to the change of the identification information, the disturbed video is not displayed on the screen, or the disturbed audio is output. Do not let it.

In the digital broadcast receiving apparatus, the control means controls the decoding means in accordance with the identification information and its change, so that a disturbed image is not displayed on the screen or a disturbed sound is not output. To do.

According to the change of the identification information, the output means for outputting information based on the identification information notifies the user of the change of the resolution.

Further, in order to achieve the above object, the digital broadcast transmitting apparatus of the present invention adds identification information to digital information for each different video resolution or audio quality by the identification information adding means for adding the identification information, Transmits digital information with identification information.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a digital broadcast receiving apparatus according to the present invention will be described below.

FIG. 2 is a block diagram showing an embodiment of a digital broadcast receiving apparatus when the present invention is applied to a multi-channel digital broadcast. 2, a digital broadcast receiving apparatus 100 includes an input terminal 101 for digital information in which some video / audio / data are multiplexed and modulated, a receiving section 11, a packet separating section 12, a memory section 13,
Analysis control unit 14, decoding unit 15, OSD synthesis unit 16
And a video / audio mute unit 17 and an output terminal 102 for outputting decoded video / audio / data and the like.

The analysis control unit 14 controls the display / audio mode (for discriminating whether the video to be displayed is standard resolution or high resolution, and whether the output audio is standard quality or high quality). Of the digital information, and an OSD control unit 142 for controlling the OSD synthesizing unit 16 in accordance with the display / audio mode output from the mode detection unit 141. It analyzes and controls each part and creates OSD data.

The receiving unit 11 demodulates the received digital information and corrects an error generated during transmission.

The packet separation unit 12 selectively extracts desired video / audio / data signals and control information from the multiplexed signals.

The memory unit 13 includes a mode storage unit 131 and stores program information, display / audio mode, and the like. In particular, the display / voice mode is stored in the mode storage unit 131.

The decoding section 15 decodes the digital signal separated by the packet separating section 12 to generate a video signal and an audio signal.

The OSD synthesizing section 16 synthesizes the OSD data and the decoded video signal.

The video / audio mute section 17 mutes the video signal and the audio signal decoded by the decoding section 15 in response to a command sent from the analysis control section 14 (non-display video, mute audio). In the present embodiment, switching of the display / audio mode is expressed as, for example, switching from standard resolution to high resolution in the case of video, and expressed as, for example, switching from standard quality to high quality in the case of audio. In the case of video, the switching of the video / audio mode is, for example, switching of the encoding method type such as MP @ ML or MP @ HL defined by MPEG-2, or switching of the current TV (Te
levision: Television quality and HDTV (High Def)
inition Television: Switching of image quality such as image quality comparable to high-definition television. In the case of audio, for example, MP
It means switching of the type of the encoding method such as MPEG-1 Audio or MPEG-2 AAC specified by EG-1.

The switching of the type of video encoding method is as follows.
For example, from MP @ ML or MP @ LL (Main Profile at Low Level)
Switching to MP @ HL or switching from MP @ HL to MP @ ML or MP @ LL. Furthermore, in MPEG-2, a plurality of resolutions are defined within the same profile and level, and the switching of resolutions within the same profile and level can be handled in the same manner in this embodiment.

The switching of the type of the audio encoding method is as follows.
For example, switching from MPEG-1 Audio to MPEG-2 AAC,
It is the opposite switch.

As described above, in the present embodiment, the display mode is set to the type of video resolution, image quality, encoding method, and the like, and the audio mode is set to the type of audio quality, encoding method, and the like. The switching is expressed as, for example, the switching of the resolution, and the switching of the audio mode is expressed as, for example, the switching of the audio quality.

Next, a process from reception of a digital signal to output in this embodiment will be described.

When receiving a multi-channel digital broadcast, a digital signal in which a plurality of pieces of video / audio data and a plurality of pieces of information (for example, channel information and program information being received) are multiplexed is input to the input terminal 101. Then, the reception section 11 demodulates the digital signal. The multiplexed digital signal includes some compressed video / audio / data and control information, for example, control information specified by MPEG.

The packet separation unit 12 separates the demodulated digital signal according to a command sent from the analysis control unit 14, and transfers coded video data and coded audio data to the decoding unit 15, for example. Then, control information such as program information is transferred to the memory unit 13.

The decoding section 15 decodes data separated and transmitted from the packet separating section 12, for example, coded video data and coded audio data. The decoded video data and audio data are transferred to the video / audio mute unit 17, and the video data is transferred to the OSD synthesis unit 16. Although not shown in FIG. 1, the audio data is output to an external audio output device such as a speaker.

The video / audio mute unit 17 mutes the decoded video data and audio data transmitted from the decoding unit 15 according to the command transmitted from the analysis control unit 14.

The OSD synthesizing unit 16 includes an OSD control unit 142
In response to a command sent from the
The decoded video data transmitted via the audio mute unit 17, and in some cases, the superimposed OSD data on the muted video data are output to an output terminal 102.
, To an external video output device such as a monitor. Further, even when there is no video data transmitted from the decoding unit 15, the OSD combining unit 16
2 outputs an OSD signal in response to a command sent from.

As described above, the multi-channel digital broadcast is received, and the received video data is combined with the OSD signal.

Next, an example of detection of the display / voice mode in this embodiment will be described.

In digital broadcast receiving apparatus 100, analysis control section 14 controls packet separation section 12 to separate control information included in input digital information. The control information is determined by the broadcast station, and includes, for example, information that associates the number of the channel being broadcast with the identification number of video / audio / data, information on the reception frequency of each channel, and program names and program contents. Program information and the like are included, and the display / audio mode is also included as one of the information. The mode detection unit 141 detects a display / audio mode from the separated control information. The memory unit 13 stores control information, and in particular, the mode storage unit 131 stores a display / audio mode.

As the control information, for example, ISO / IEC 13
PMT (Program Map Table: an identification number of video / audio constituting a received program is described) specified in 818-1. For example, when the display / audio mode is acquired using the PMT, the PMT contains a location (stream_t) that describes the encoding method of the received video / audio.
ype), and the display / audio mode can be described in the above-mentioned location. The analysis control unit 14 includes the packet separation unit 1
2 to control the PM from the input digital information.
Separate T. The mode detection unit 141 analyzes, for example, stream_type from the separated PMT, detects a display / audio mode, and sets the display / audio mode to the mode storage unit 1.
31. Instead of describing the video / audio coding method in the stream_type, it is also possible to newly provide a place for describing the coding method in the PMT, for example, and to describe the display / audio mode in the position. In this case, the mode detection unit 141 analyzes, for example, a portion describing the newly provided encoding method from the separated PMT, detects a display / audio mode, and sets the display / audio mode to the above. It is stored in the mode storage unit 131.

Further, another example of detection of the display / voice mode in this embodiment will be described.

The bit stream such as video / audio separated by the packet separating unit 12 is transmitted to the decoding unit 15 and decoded. For example, when a display mode is recorded in a header in a coded bit stream of a video, the analysis control unit 14 controls the decoding unit 15,
Decode the video bitstream. The mode detecting section 141 controls the decoding section 15 to detect a display mode from a header in a coded video bitstream, and stores the display mode in the mode storage section 131.
Similarly, in the case of audio, for example, when an audio mode is recorded in a header in a bit stream in which audio is encoded, the analysis control unit 14 controls the decoding unit 15 to convert the audio bit stream. Decrypt. The mode detection unit 141 controls the decoding unit 15 to detect the audio mode from the header in the encoded audio bit stream, and stores the audio mode in the mode recording unit 131.

In this way, the analysis control unit 14, particularly the mode detection unit 141, receives control information describing the display / audio mode every time the video or program being received is switched. Every time a bit stream describing the display / audio mode arrives,
The display / voice mode is detected at arbitrary intervals and stored in the mode storage unit 131.

Next, a description will be given of a method for preventing display of a video / audio that is disturbed every time the resolution / audio quality of a received video is switched.

In the digital broadcast receiving apparatus 100, after the display / audio mode is stored in the mode storage unit 131 as described above, when the mode detection unit 141 detects the display / audio mode transmitted next, The analysis control unit 14 controls the mode storage unit 131 to read out the display / audio mode already stored. When the read display / audio mode and the transmitted display / audio mode are the same, the analysis control unit 14 further performs the packet separation unit 12 and the decoding unit so as to detect the next transmitted display / audio mode. 15 and so on. When the read display / audio mode is different from the transmitted display / audio mode, the analysis control unit 14 controls the OSD synthesizing unit 16 and the video / audio mute unit 17 and outputs the output terminal 10.
2 prevents the display of a disturbed video due to the decoded video / audio signal output from the decoder 2 and the output of the disturbed audio.

When the video / audio mute unit 17 is controlled to prevent display of a disturbed video, the analysis control unit 14
Controls the video / audio mute unit 17 to mute the video signal. The video / audio mute unit 17
The video signal sent from the decoding unit 15 is muted in response to the sent command, and the OSD combining unit 16 is muted.
Transfer to In this case, the OSD control unit 142 does not control the OSD synthesizing unit 16, and the OSD synthesizing unit 16 outputs the transmitted muted video signal via the output terminal 102. Similarly, the video / audio mute unit 1
7 to prevent the output of the disturbed sound by controlling the video signal 7,
The audio mute unit 17 is controlled. The video / audio mute unit 17 mutes the audio signal transmitted from the decoding unit 15 in response to the transmitted command, and outputs the audio signal via the output terminal 102.

On the other hand, when controlling the OSD synthesizing unit 16 to prevent the display of a disturbed image, the analysis control unit 14 detects the switching of the display mode and changes the display screen via the OSD control unit 142. The OSD synthesizer 16 is controlled so as to be covered by the OSD. OSD synthesis section 16
The OSD signal is superimposed on the video signal transmitted from the decoding unit 15 via the video / audio mute unit 17 in response to the transmitted command, and the superimposed signal is transmitted via the output terminal 102 via the output terminal 102. Output.

In this way, every time the resolution of the video or the quality of the audio is switched, that is, each time the display / audio mode is switched, the display of the disturbed video can be prevented, or the output of the disturbed audio can be prevented. Can be.

In the embodiment described above, the case where the display / audio mode is described in the control information to be input or in the header of the video bit stream has been described. However, even when there is no description of the display / audio mode as described below, there is a method of preventing the display of an image that is disturbed every time the resolution of the image or the quality of the audio is switched, or the output of the disturbed sound.

Although omitted in FIG. 2, the broadcast station that multiplexes the control information with the video / audio and the like constituting the program and transmits the PMT to the control information before the video resolution is switched. Include and send. The above PMT is ISO / IEC 13818-
It is standardized by 1 and describes an identification number of a video / audio constituting a received program and the like. The PMT contains a PMT version number (version_number: PM
(A number that increases by one when the information in T changes). Therefore, the broadcast station increases the version number by one before transmission of the video resolution or audio quality is switched, for example, several seconds before transmission.
In the digital broadcast receiving apparatus 100, the analysis control unit 14 controls the packet separation unit 12 to separate the PMT and detect the version number. After the detection, the analysis control unit 14 stores the version number in the memory unit 13, and detects the version number again from the next transmitted PMT. The analysis control unit 14 controls the memory unit 13,
Read the version number of the PMT already stored,
Compare with the version number detected from the transmitted PMT. If the version number detected from the transmitted PMT is different from the already stored PMT, eg, the version number is one larger than the stored version number, the analysis control unit 14 sets the OSD synthesis unit 16 And the above video /
The audio mute unit 17 is controlled to prevent display of a disturbed video due to the decoded video signal output from the output terminal 102, and similarly, the display is disturbed by the decoded audio signal output from the output terminal 102. Prevent audio output.
That is, the decoding unit 15 is controlled to stop decoding,
The video / audio mute unit 17 is controlled to mute the video / audio signal, or in the case of video in particular, the OSD synthesis unit 16 is controlled to cover the display screen with the OSD.

As described above, by using the PMT version number, it is possible to prevent the display of the disturbed video or the output of the disturbed audio every time the resolution of the video or the quality of the audio is switched. it can. Also,
A method of acquiring the display / audio mode using the PMT version number and preventing display of a video that is disturbed each time the resolution of the video is switched, and preventing output of a disturbed audio each time the resolution of the audio is switched. There is also.

In the digital broadcast receiving apparatus 100,
The analysis control unit 14 controls the packet separation unit 12 and the memory unit 13 by the method of the above-described embodiment, and detects different PMT version numbers. Alternatively, the analysis control unit 14 controls the memory unit 13 to read the version number of the PMT already stored, and sends the packet separation unit 12 a PMT having a version number different from the read version number of the PMT. An instruction to separate the PMTs is issued, and the packet separation unit 12 detects the PMTs having different version numbers and obtains the PMTs after the separation.
With these methods, a PMT having a version number different from the PMT stored in the memory unit 13 can be obtained.
As described above, even when the change in the version number of the PMT is used as a trigger for display / audio mode acquisition, the display / audio mode included in the PMT can be acquired.

The analysis control unit 14 determines that the new PM
Detects display / audio mode after receiving T to prevent display of distorted video every time the resolution of the video is switched,
The method of preventing the output of the sound that is disturbed every time the sound quality is switched is as described in the embodiments described above.

The difference between this embodiment and the above-mentioned embodiment using the PMT version number is that, in the above-described embodiment, when the PMT having the different number is received, the display / audio mode is acquired and analyzed. In contrast, in the embodiment described later, when the PMT having the different number is received, the display / audio mode is acquired and analyzed, and the video / audio is changed. This is to prevent disturbance during switching.

FIG. 2 shows a digital broadcast receiving apparatus 100.
In the above, the video / audio mute unit 17 and the OSD synthesizing unit 16 are both provided as non-display means of the disturbed video, but from the above, the present invention includes only one of these means. It may be a configuration.

The structure is shown in FIGS.

FIG. 3 is a block diagram showing an embodiment of a digital broadcast receiving apparatus provided with only the video / audio mute unit 17 as non-display means for disturbed video, and FIG. FIG. 2 is a block diagram illustrating an embodiment of a digital broadcast receiving device including only the OSD synthesizing unit 16.

FIG. 5 shows that every time the resolution of the video is switched,
FIG. 7 is a diagram illustrating an example of a display screen of the external display device 300 in a case where the OSD synthesis unit 16 is controlled to cover the entire display screen with the OSD and prevent display of a distorted image. Also, when the video / audio mute unit 17 is controlled to mute the video signal and prevent the display of the disturbed video, the same effect as in FIG. 5 can be obtained.

Next, a description will be given of a case where the video after the resolution of the video is switched or the audio after the quality of the voice is switched is output in the embodiment described above.

When the video / audio mute unit 17 is controlled to prevent display of a disturbed video and output of a disturbed audio,
After muting the video / audio signal, the analysis control unit 14 controls the packet separation unit 12 to separate the video / audio bit stream after the video resolution or audio quality has been switched, and sends it to the decoding unit 15 for decoding. Let it. Decoding section 1
5 is the video / video after the video resolution and audio quality have been switched.
After decoding the audio bit stream, the analysis control unit 1
Notify 4 to that effect. The analysis control unit 14 controls the video / audio mute unit 17 to release the mute of the video / audio signal in response to a command from the decoding unit 15. The video / audio mute unit 17 releases the mute of the video signal / audio in response to the mute release command, and in the case of video, converts the decoded video signal into the OSD signal.
The signal is transmitted to an external output device such as a monitor via the synthesizing unit 16 and the output terminal 102, and in the case of audio, the decoded audio signal is transmitted to the external output device such as a speaker via the output terminal 102. . The image after the resolution of the image is switched is displayed on a monitor or the like, and the audio after the audio quality is switched is output to a speaker or the like.

As another method for controlling the video / audio mute unit 17 to prevent display of a disturbed video or output of a disturbed audio, after the video / audio signal is muted, the analysis control unit 14 By controlling the packet separation unit 12, the video / video after the resolution and audio quality of the video are switched.
The audio bit stream is separated and sent to the decoding unit 15 for decoding. Further, the analysis control unit 14 instructs the decoding unit 15 to decode the video / audio bit stream after the video resolution or audio quality has been switched and then decode the video / audio bit stream.
A command is sent to unmute the audio signal. The decoding unit 15 receives the command, decodes the video / audio bit stream after the video resolution and audio quality have been switched, and then decodes the video / audio mute unit 17.
To cancel the mute of the video / audio signal. In the case of a video, the video / audio signal is transmitted to an external output device via the OSD synthesizing unit 16 and the output terminal 102. In the case of a voice, the decoded audio signal is transmitted. The data is transmitted to an external output device via the output terminal 102. The image after the resolution of the image is switched is displayed on a monitor or the like, and the audio after the audio quality is switched is output to a speaker or the like.

When the decoding of the decoding unit 15 is stopped while the video / audio signal is muted, the analysis control unit 14 controls the packet separation unit 12 to control the resolution and resolution of the video. The video / audio bit stream after the switching of the audio quality is separated, and the decoding of the decoding unit 15 is restarted.

When the OSD synthesizing unit 16 is controlled to prevent display of a distorted image, the analysis control unit 14 transmits the OSD signal and the video signal to the OSD synthesizing unit 16 via the OSD control unit 142. Send a command to stop the overlay. The OSD synthesizing unit 16 stops the superposition of the OSD signal and the video signal in response to the transmitted command. The video after the resolution of the video has been switched is displayed.

As described above, switching of video resolution and audio quality is detected by the digital broadcast receiving apparatus 100 as display mode or version number switching, and the video / audio signal is muted according to the switching, or Regarding the above, by superimposing the OSD signal on the video signal, it is possible to prevent the display of the video and the output of the voice which are disturbed every time the resolution and the sound quality of the video are switched. In the embodiment described above, the OSD synthesizing unit 16 and the video / audio mute unit 17 are used to prevent display of a video that is disturbed every time the resolution is switched,
The method of preventing the output of the sound that is disturbed each time the sound quality is switched has been described. However, as described below, even when the decoding unit 15 is used without using the OSD synthesizing unit 16 and the video / audio mute unit 17, it is possible to prevent display of a video that is disturbed every time the resolution of the video is switched, It is possible to prevent the output of sound that is disturbed every time the sound quality is switched.

In digital broadcast receiving apparatus 100, analysis control section 14 controls the display / audio mode included in the input control information in the same manner as the above-described method of acquiring the display / audio mode.
Get the audio mode. The analysis control unit 14 analyzes the acquired display / audio mode, and when the resolution or audio quality of the video is switched, does not control the OSD synthesis unit 16 or the video / audio mute unit 17 and sets the decoding unit 15 Control, stop decoding of the input video / audio bit stream, freeze display (pause display) the video before the video resolution is switched, or mute the audio before the audio quality is switched . Further, the analysis control unit 14 controls the packet separation unit 12 to separate the video / audio bit stream after the resolution and the audio quality of the video have been switched, and sends them to the decoding unit 15. At this point, visually, the previous video is in a pause state, and auditoryly, nothing is heard.

In addition to the above embodiment, the following
There are also methods of using the decoding unit 15 to freeze-display a video or mute audio.

In digital broadcast receiving apparatus 100, analysis control section 14 acquires the display / audio mode included in the input control information in the same manner as the method for acquiring the display / audio mode. The analysis control unit 14 analyzes the acquired display / audio mode, and when the resolution or audio quality of the video is switched, the analysis control unit 14
A command is sent to continue decoding until the end of the video / audio bit stream currently being decoded, and to stop decoding when the video / audio bit stream ends. Upon receiving the command, the decoding unit 15 decodes up to the last video / audio bit stream before the video resolution or audio quality is switched, stops decoding after decoding the last, and stops decoding before the video resolution is switched. Freeze-displayed video,
Mute the sound before the sound quality is switched.

The above-described embodiment uses a method in which the decoding unit 15 detects the end of the video / audio bit stream before switching the video resolution or audio quality without using special information in the video / audio bit stream. However, as another implementation method, information indicating the end of a video / audio bit stream before switching of video resolution or audio quality (hereinafter, referred to as a stream end identifier for convenience) is used as a video / audio bit stream. And decoding is continued until the stream end identifier is detected, and decoding is stopped when the stream end identifier is detected. In this case, in the digital broadcast receiving apparatus 100,
The analysis control unit 14 acquires the display / audio mode included in the input control information in the same manner as the method for acquiring the display / audio mode. The analysis controller 14 decodes the video / audio bit stream before switching until it detects the stream end identifier, and sends a command to stop decoding when the stream end identifier is detected. . The decoding unit 15
Receives the command and continues decoding until the stream end identifier is detected, and upon detecting the stream end identifier, freezes the video before the video resolution is switched or mutes the audio before the audio quality is switched. Or let it.

The method described above is based on the premise that the display information / voice mode is included in the input control information.
When the display / audio mode is not included, as described above, the change of the PMT version number included in the control information causes the decoding unit 1 to perform the above-described method.
5 to freeze-display the video before the video resolution is switched or mute the audio before the audio quality is switched.

When decoding up to the last video / audio bit stream before the input video resolution or audio quality is switched, the analysis control unit 14
There is also a method of controlling whether the decoding is performed until the video / audio bit stream ends or whether the decoding is performed until the stream end identifier is detected. In this case, information indicating whether or not the stream end identifier has been added to the input control information (hereinafter, referred to as end identifier additional information for convenience) is added. The end identifier additional information is:
Included in the input control information, for example, a location for storing information is newly provided in the PMT, and the location indicates whether or not the stream end identifier is added to the end of the video / audio bit stream. Is stored in the input control information, transmitted, and received by the digital broadcast receiving apparatus 100. For example, in the case of a video, the stream end identifier includes sequence_end_code (identifier indicating the end of the sequence) specified by MPEG.

Instead of the display / audio mode, the input control information includes information indicating whether or not the resolution of the video and the quality of the audio are switched (hereinafter, referred to as switching information for convenience).
Can be realized by freeze display of the video before the video resolution is switched, or muting of the audio before the voice quality is switched. In the digital broadcast receiving device 100, the analysis control unit 14
In the same way as the method of acquiring the display / voice mode,
The switching information included in the input control information is obtained. The analysis control unit 14 analyzes the obtained switching information, and controls the decoding unit 15 when the resolution or audio quality of the video is switched. The decoding unit 15
Stops decoding by a method similar to the above-described method of stopping decoding, freeze-displays the video before the video resolution is switched, and mutes the audio before the audio quality is switched.

The switching information is included in the input control information. For example, a location for storing information is newly provided in the PMT, and stored in the location as information indicating that the resolution of video and the quality of audio are to be switched. This allows the digital broadcast receiving apparatus 100 to transmit the received control information while including it in the input control information.

The switching information and the end identifier additional information can be added independently, for example, in the PMT, or can be added at the same time. Therefore, when the display / audio mode is not provided, the change in the version number of the PMT is monitored, and by using the switching information and the end identifier additional information, the video before the resolution of the video is switched is freeze-displayed. Alternatively, the sound before the sound quality is switched can be muted.

Next, the case where the above switching information and the end identifier additional information are used will be described.

In the digital broadcast receiving apparatus 100, the analysis control unit 14 controls the packet separating unit 12 and includes control information to be input, for example, PMT, in the same manner as in the method of acquiring the display / audio mode. The switching information is obtained and analyzed. When the resolution or audio quality of the video is switched, the analysis control unit 14 analyzes the end identifier additional information, and when there is a stream end identifier at the end of the input video / audio bit stream, the analysis control unit 14 The decoding unit 15 decodes the video / audio bit stream before switching until the stream end identifier is detected, and sends a command to stop decoding when the stream end identifier is detected. Upon receiving the command, the decoding unit 15 continues decoding until the stream end identifier is detected, and upon detecting the stream end identifier, freezes the video before the video resolution is switched or displays the video before the audio quality is switched. Or mute the audio. Conversely, when there is no stream end identifier at the end of the input video / audio bit stream, the analysis control unit 14 controls the decoding unit 15 to stop decoding the input video / audio bit stream. Alternatively, the analysis control unit 14
Sends a command to the decoding unit 15 to continue decoding until the end of the video / audio bit stream currently being decoded, and to stop decoding when the video / audio bit stream ends. In response to the command, decoding is performed up to the last video / audio bit stream before the video resolution and audio quality are switched, and decoding is stopped after decoding the last. In this way, it is possible to freeze-display the video before the resolution of the video is switched or mute the audio before the audio quality is switched.

Next, a description will be given of a method of displaying an image after changing the resolution and audio quality of the image and outputting the audio in the embodiment described above.

In the case where the decoding unit 15 is controlled to prevent the display of a disturbed image or the output of a disturbed sound, the analysis control unit 14
Controls the packet separation unit 12, separates the video / audio bit stream after the resolution of the video and the quality of the audio have been switched, and sends it to the decoding unit 15. Further, the analysis control unit 14 instructs the decoding unit 15 to decode the video / audio bit stream after the video resolution and audio quality have been switched, and to perform video display and audio output normally. Send a command to cancel the display or unmute the audio. The decoding unit 15 receives the command, decodes the video / audio bit stream after the video resolution and audio quality have been switched, and then freezes or mutes the audio when the video display or audio output is normally performed. Cancel. In this way, the video after the resolution and audio output of the video are switched is displayed on a monitor or the like, and the audio after the quality of the audio is switched is output to a speaker or the like.

In the embodiment using the decoding section 15 described above, the OSD synthesizing section 16 and the video / audio mute section 17 are used.
However, an embodiment in which a method of controlling the OSD synthesizing section 16 and the video / audio mute section 17 to mute the video / audio is added is also possible.

In the above embodiment, the analysis control unit 14
Sends two commands to the decoding unit 15: a command for stopping decoding and a command for restarting decoding. However, it is also possible to realize the two commands with one command. That is, when a command relating to the decoding stop is sent to the decoding unit 15 by the method described above, the video / audio bit stream after the video resolution and audio quality have been switched is decoded, and the video display and audio output are performed normally. When it is completed, it can be realized by sending a command to cancel the freeze display of the video or cancel the mute of the audio.

As described above, even if the video / audio bit stream after the video resolution or audio quality is switched next is input, the video before the resolution is switched by the decoding unit is freeze-displayed, Since the audio before the quality is switched is muted and the video display and audio output are not resumed until the decoding unit can display the video and audio output normally,
It is possible to prevent display of a disturbed image and output of a disturbed sound.

FIG. 6 is a diagram showing an example of a display screen of the external display device 300 when the resolution of the video is switched, particularly when the video bit stream of the standard resolution is switched to the video bit stream of the high resolution.

In the digital broadcast receiving apparatus 100, the mode detecting section 141 receives the digital broadcast while receiving the digital broadcast.
It controls the packet separation unit 12 and the decoding unit 15 to detect resolution information from the digital information currently being received, and stores the obtained resolution information in the mode storage unit 131 as a display mode. When the stored past display mode is different from the current display mode to be detected, that is, when the resolution of the video is switched, the OSD control unit 142 is notified that the display mode has been switched. The OSD control unit 142 controls the OSD synthesizing unit 16 according to the transmitted information, superimposes the OSD signal corresponding to the current display mode on the video signal, and outputs the OSD signal to the external display device 300 via the output terminal 102. I do.

When the display mode is not switched, the mode detection section 141 does not control the OSD control section 142 at all.

By the method described above, the user can be notified through the screen that the display mode has been switched. As other methods, there are a method of displaying by a display tube provided in the digital broadcast receiving apparatus and a method of outputting and presenting sound.

A case will be described in which the switching of the display mode is presented by outputting a sound, for example. When the display mode is switched, a sound that indicates that
The signal is transmitted to and output from an external audio output device, for example, a speaker. Also, for example, by outputting the change of the display mode by a buzzer or the like, the change of the display mode can be similarly output. These controls are performed by the analysis control unit 142.

A case will be described in which the display mode switching is displayed by the display tube provided in the digital broadcast receiving apparatus. The display tube displays, for example, a date, a current time, a received channel number, audio information, and the like. This display tube is provided with a part that indicates the type of resolution, and is lit only when a high-resolution video signal is displayed.On the contrary, it is lit only when a standard-resolution video signal is displayed. For example, there are means for providing two places indicating the standard resolution and lighting the place corresponding to the displayed resolution. These controls are also performed by the analysis control unit 142. By the same method as the above-described embodiment, even in the case of audio, the fact that the audio mode has been switched is displayed to the user through the screen, or displayed by the display tube provided in the digital broadcast receiving device, By outputting the audio, it is possible to indicate that the audio mode has been switched.

In this manner, the current resolution / audio quality information can be displayed, and the resolution and audio quality of the video can be switched without giving the user a sense of discomfort.

As described above, when the resolution of the video is switched from the standard resolution to the high resolution, or when the resolution is switched from the high resolution to the standard resolution, the OS
By synthesizing the D signal, muting the video signal, or stopping the decoding of the video bit stream, it is possible to prevent the disturbed video from being displayed on the screen. Similarly, for audio, when the audio quality switches from standard quality to high quality, or when switching from high quality to standard quality, the audio signal is muted or the decoding of the audio bit stream is stopped. In addition, it is possible to prevent a disturbed sound from being output. In addition, when the resolution and audio quality of the video are switched, the current video resolution and audio quality are presented by outputting the effect of the change to the outside, and the resolution and audio quality of the video are displayed without giving the user a sense of discomfort. Can be switched.

Further, an embodiment of the digital broadcast transmitting apparatus according to the present invention will be described.

In FIG. 7, reference numeral 400 denotes a transmitting device in a broadcast station or the like, 401 denotes an input unit, 402 denotes an output unit, 410 denotes a server, 420 denotes an encoding unit, 430 denotes a multiplexing unit, and 440 denotes a multiplexing unit.
Denotes a transmission unit, 450 denotes a mode insertion unit, and 460 denotes a control unit.

In the transmission device 400, the server 410
Stores various data streams such as compressed video data and compressed audio data, pre-compressed video data and pre-compressed audio data, and program information. When a command is received from the control unit 460, the data specified by the command is stored. The stream is read, and the video / audio data before compression is encoded by the encoding unit 4.
20, the compressed video / audio data, program information, and the like are transferred to the multiplexing unit 430.

[0100] Encoding section 420 encodes video / audio data transmitted from the server or the outside, and transfers it to multiplexing section 430.

The multiplexing section 430 multiplexes a plurality of designated data streams and transfers the multiplexed data streams to the transmitting section 440. When the designated data stream is charged, the data stream is transferred to an encryption circuit, and transferred together with information for releasing the data stream.

[0102] Transmitting section 440 modulates the multiplexed digital information and transmits it to a plurality of digital broadcast receiving apparatuses. Transmission means from the transmitting device 400 to the plurality of digital broadcast receiving devices 100 include an optical fiber, a coaxial cable, a digital communication satellite, and the like.
Any of the above transmission means is applicable.

The mode inserting section 450 controls the multiplexing section 430, and stores the display / audio mode storage section in the control information to be multiplexed and transmitted, for example, the stream_type included in the PMT,
For example, the display / audio mode of the video / audio to be transmitted is stored at a location newly provided for storing the display / audio mode. Further, when the display / audio mode is switched, information indicating the switching is stored in the switching information storage section in the control information to be multiplexed and transmitted, and the video / audio bit stream before the switching is stored in the end identifier additional information storage section. Information on whether a stream end identifier is added is stored. When the stream end identifier is added to the video / audio bit stream before the switching, the encoder 420 is controlled to add the stream end identifier to the video / audio bit stream.

When the display / audio mode is switched, the PM
When using the version number of T, the control unit 460 controls the multiplexing unit 430 to multiplex the PMT after updating the version number in order to update the PMT version number.
The signal is modulated at 40 and transmitted.

In this way, the digital information is transmitted with the display / audio mode added to the digital information.
, The digital information received is analyzed, and the current display / audio mode can be obtained.

[0106]

As described above, according to the digital broadcast receiving apparatus of the present invention, it is possible to prevent the display of a video that is disturbed every time the resolution of the video is switched, and to prevent the disturbed sound from being displayed each time the audio quality is switched. Output can be prevented.

When the resolution of the video is switched, the resolution currently being viewed can be presented, and the resolution of the video can be switched without giving the user a sense of incongruity.

Furthermore, according to the digital broadcast transmitting apparatus of the present invention, digital information can be transmitted with identification information added.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a conventional digital broadcast receiving device.

FIG. 2 is a block diagram illustrating an embodiment of a digital broadcast receiving apparatus according to the present invention.

FIG. 3 is a block diagram showing one embodiment of a digital broadcast receiving apparatus of the present invention.

FIG. 4 is a block diagram illustrating an embodiment of a digital broadcast receiving apparatus according to the present invention.

FIG. 5 is a diagram illustrating an example of a display screen of an external display device.

FIG. 6 is a diagram illustrating an example of a display screen of an external display device.

FIG. 7 is a block diagram showing one embodiment of a digital broadcast transmitting apparatus of the present invention.

[Explanation of symbols]

11: receiving unit, 12: packet separating unit, 13
..Memory unit, 14 analysis control unit, 15 decoding unit, 16 OSD synthesis unit, 17 video / audio mute unit, 100 digital broadcast receiving device, 101
... input terminal, 102 ... output terminal, 131 ...
Mode storage unit, 141... Mode detection unit, 142.
OSD control unit, 200: conventional digital broadcast receiving device, 300: external display device, 301: screen preventing display of distorted video, 302: screen displaying resolution information , 400 ... transmitting device, 401 ...
Input unit, 402: output unit, 410: server,
420 ... coding unit, 430 ... multiplexing unit, 440
... Sending unit, 450 ... Mode insertion unit, 460 ...
・ Control unit.

Continued on the front page (72) Inventor Takanori Eda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Takumi Okamura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Japan Hitachi, Ltd. Digital Media Development Division (72) Inventor Shigeru Yoneda 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd. Digital Media Development Division (72) Inventor Masaru Nanki Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture 292, Machi, Digital Media Development Division, Hitachi, Ltd.

Claims (33)

[Claims] A digital signal receiving digital information, which is multiplexed and modulated digital information, and includes video data having different video resolutions depending on time and identification information added to the video data for identifying the resolution. A broadcast receiving apparatus, comprising: video non-display means for preventing a video based on the video data from being displayed; and sequentially detecting the identification information from the digital information, and when different identification information is detected, the predetermined period of time. A digital broadcast receiving apparatus comprising: a control unit that controls the video non-display unit so as not to display a video based on video data. 2. A digital signal receiving digital information, which is multiplexed and modulated digital information and includes a display mode for distinguishing between video data having different video resolutions with time and the resolution added to the video data. An OSD synthesizing means for superimposing an OSD signal on a signal based on the video data, wherein the display mode is sequentially detected from the digital information, and a different display mode is detected when a different display mode is detected. A digital broadcast receiving apparatus, comprising: control means for controlling the OSD synthesizing means so that an OSD signal is superimposed on a signal based on video data. 3. A digital signal receiving digital information, which is multiplexed and modulated digital information and includes a display mode for distinguishing between video data having different video resolutions depending on time and the resolution added to the video data. A broadcast receiving device, comprising: a video muting unit for muting a signal based on the video data; sequentially detecting the display mode from the digital information; and when a different display mode is detected, the video data is transmitted to the video data for a predetermined period. A digital broadcast receiving apparatus, comprising: control means for controlling the video muting means so as to mute a signal based on the digital broadcast. 4. Receiving digital information which is multiplexed and modulated digital information and includes video data having a video resolution different with time and a version number added to the video data which changes according to the change in the resolution. An OSD synthesizing means for superimposing an OSD signal on a signal based on the video data; and sequentially detecting the version number from the digital information, and detecting a change in the version number. A digital broadcast receiving apparatus, comprising: control means for controlling the OSD synthesizing means so that an OSD signal is superimposed on a signal based on the video data for a predetermined period. 5. Receiving digital information which is multiplexed and modulated digital information and includes video data having a video resolution different with time and a version number added to the video data which changes according to the change in the resolution. A digital broadcast receiving apparatus, comprising: a video muting unit for muting a signal based on the video data; sequentially detecting the version number from the digital information; and detecting a change in the version number for a predetermined period when a change in the version number is detected. A digital broadcast receiving apparatus comprising: a control unit that controls the video muting unit so as to mute a signal based on video data. 6. A digital signal receiving digital information, which is multiplexed and modulated digital information and includes video data having different video resolutions with time and identification information added to the video data for identifying the resolution. A broadcast receiving apparatus, comprising: an output unit that outputs information based on the identification information to the outside of the apparatus; and sequentially detecting the identification information from the digital information, and information based on the identification information when different identification information is detected. A digital broadcast receiving apparatus comprising: control means for controlling the output means so as to output the signal to the outside of the apparatus. 7. A digital signal receiving digital information which is multiplexed and modulated digital information and includes display data for differentiating the resolution of a video depending on time and a display mode added to the video data for distinguishing the resolution. A broadcast receiving apparatus, comprising: display means for displaying information based on the display mode; sequentially detecting the display mode from the digital information; and displaying information based on the display mode for a predetermined period when a different display mode is detected. A digital broadcast receiving apparatus, comprising: control means for controlling a display means so as to display. 8. A digital signal receiving digital information which is multiplexed and modulated digital information and includes a display mode for distinguishing between video data having different video resolutions depending on time and the resolution added to the video data. An OSD synthesizing unit for superimposing an OSD signal based on the display mode on a signal based on the video data, a display unit configured to display an image based on the OSD signal output from the OSD synthesizing unit, The display mode is sequentially detected from the digital information, and when a different display mode is detected, an OSD signal based on the display mode is superimposed on a signal based on the video data for a predetermined period and output to the display means. OS
A digital broadcast receiving apparatus comprising a control unit for controlling a D synthesizing unit. 9. A digital signal receiving digital information which is multiplexed and modulated digital information and includes a display mode for distinguishing between video data having different video resolutions depending on time and the resolution added to the video data. A broadcast receiving apparatus, comprising: an audio output unit configured to externally output information based on the display mode, and the display mode is sequentially detected from the digital information, and the display mode is set for a predetermined period when a different display mode is detected. A digital broadcast receiving apparatus, comprising: a control unit that controls the audio output unit so that information based on the audio is externally output. 10. The control means comprises: identification information detection means for detecting the identification information from the digital information; and identification information storage means for storing the identification information detected by the identification information detection means. The identification information read from the identification information storage means and the identification information detected by the identification information detection means are compared to determine whether or not the identification information is different. Digital broadcast receiver. 11. The control means comprises: display mode detecting means for detecting the display mode from the digital information; and display mode storing means for storing the display mode detected by the display mode detecting means. 8. The display mode read from the display mode storage means and the display mode detected by the display mode detection means are compared to determine whether the display mode is different. , 8 or 9. 12. The control means comprises: version number detecting means for detecting the version number from the digital information; and version number storing means for storing the version number detected by the version number detecting means. 6. The system according to claim 4, wherein the version number read from the version number storage means is compared with the version number detected by the version number detection means to determine whether the version numbers are different.
A digital broadcast receiving device according to claim 1. 13. The digital broadcast receiving apparatus according to claim 2, wherein the display mode is described in a stream_type in a PMT included in the digital information. 14. The digital broadcast receiving apparatus according to claim 2, wherein the display mode is described in a header in a video bit stream included in the digital information. 15. The digital broadcast receiving apparatus according to claim 4, wherein the version number is described in a PMT included in the digital information. 16. A digital broadcast transmitting apparatus for multiplexing and modulating video data having different video resolutions with time and transmitting the digital data as digital information, wherein identification information for distinguishing the resolution is added to the video data. A digital broadcast transmitting apparatus, comprising: 17. A digital broadcast transmitting apparatus for multiplexing and modulating video data having different video resolutions with time and transmitting the digital data as digital information, wherein a display mode for distinguishing the resolution is added to the video data. A digital broadcast transmitting apparatus comprising a display mode adding means for performing the operation. 18. A digital broadcast transmitting apparatus for multiplexing and modulating video data having different video resolutions with time and transmitting the digital data as digital information, wherein the version number is changed so as to change according to the change in the resolution. A digital broadcast transmitting device comprising a version number adding means for adding to a video data. 19. The digital broadcast transmitting apparatus according to claim 17, wherein the display mode is described in a stream_type in a PMT included in the digital information. 20. The digital broadcast transmitting apparatus according to claim 17, wherein the display mode is described in a header in a video bit stream included in the digital information. 21. The digital broadcast transmitting apparatus according to claim 18, wherein the version number is described in a PMT included in the digital information. 22. Digital information receiving means for receiving digital information obtained by encoding and multiplexing some video / audio / data and the like, and a desired signal from digital information inputted from said digital information receiving means. Packet separating means for separating the digital information, memory means for storing control information included in the digital information separated by the packet separating means, decoding means for decoding the digital signal separated by the packet separating means, and decoding OSD (On Screen)
A digital broadcast receiving apparatus comprising: an OSD synthesizing means for synthesizing a signal; a digital information receiving means; a packet separating means; a memory means; The control information has identification information capable of identifying at least a resolution level of a video signal to be decoded. The analysis control means identifies the identification information, compares the identification information with information currently being displayed, and performs processing of the decoding means. Wherein the display of the video signal is not displayed for a period until the decoding means starts decoding, when it is necessary to switch the video signal. 23. The control information is a PMT (Program Map Tabl).
23. The digital broadcast receiving apparatus according to claim 22, further comprising e), wherein the video signal decoded by the decoding unit is hidden according to the identification information included in the PMT. 24. An OSD synthesizing means for synthesizing an OSD signal and a video signal decoded by said decoding means, and hiding a video signal decoded by said decoding means by an OSD signal. Item 22 or 2
4. The digital broadcast receiving device according to 3. 25. The digital broadcast receiving apparatus according to claim 22, wherein a display mode detected based on identification information included in the control information is displayed. 26. The digital broadcast receiving apparatus according to claim 25, wherein when a decoding method of said decoding means is switched according to identification information included in control information, a display mode is output by OSD display or voice. 27. The control means controls the decoding means in accordance with the identification information, stops decoding of the video / audio signal before the video resolution / audio quality is switched, and sets the video resolution / audio for a predetermined period. 24. The digital broadcast receiving apparatus according to claim 1, wherein the video / audio signal after the quality is switched is not output. 28. The identification information includes switching information for storing that the video resolution / audio quality is switched, and the video / audio signal decoded by the decoding means is not output for a predetermined period according to the switching information. The method according to claim 1, 23 or 2, wherein
8. The digital broadcast receiving device according to 7. 29. When the video resolution / audio quality is switched, an identifier indicating the end is added to the input video / audio data, and in accordance with the identifier, the control means controls the decoding means. The digital broadcast receiving apparatus according to claim 27, wherein the digital broadcast receiving apparatus performs control. 30. The identification information includes identifier additional information indicating whether or not an identifier indicating the end of the video / audio data is added to the video / audio data, and the control means controls the control means in accordance with the identifier additional information. The digital broadcast receiving device according to claim 29, wherein the device controls the decoding means. 31. The digital broadcast receiving apparatus according to claim 28, wherein the switching information and the identifier additional information are included in the PMT. 32. An identifier indicating the end of the video data is se.
31. The digital broadcast receiving device according to claim 29, wherein the digital broadcast receiving device is quence_end_code. 33. The digital broadcast transmitting apparatus according to claim 16, wherein the switching information and the identifier additional information are described in a part of a PMT included in the digital information.