JP2013251766A - Broadcast reception apparatus and broadcast reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast reception apparatus which dispenses with waiting image output every time of special reproduction, even if a program in which a caption is behind an image is recorded in a transport stream form.SOLUTION: When recording a program in which a caption is behind an image such as generating and multiplexing the caption in real time in a live program, the display timing (PTS) of caption data is corrected to a side to be displayed earlier, rearrangement is performed such that the position of the caption data is moved to a position to be nearer to image data having the same display timing and to become a plus time with respect to PCR, and thereafter the caption data is recorded in a recording medium.

Description

  The present invention relates to a broadcast receiving apparatus capable of receiving subtitle information and recording / reproducing information on a recording medium.

  Conventionally, in order to eliminate the gap between the video and the subtitle when the subtitle is delayed with respect to the video, a method of broadcasting by delaying the display timing of the video by the delay of the subtitle has been considered. For this reason, if a program whose subtitles are delayed with respect to the video is recorded and played back, the start of playback is awaited every time special playback such as fast-forward, fast-reverse, or jump playback is performed.

  Conventionally, in a recording / playback apparatus that receives and broadcasts broadcast data broadcast in real time, such as live news subtitle broadcast, for example, the subtitle display timing is corrected and the video / audio is reproduced during playback. A technique for eliminating the delay in displaying captions is known (see, for example, Patent Document 1).

  However, when recording and playing back a program in the form of a transport stream, for example, a program whose subtitle is delayed with respect to video, such as generating and multiplexing subtitles in real time in live broadcast, The transport stream with the remaining delay is recorded. When a transport stream with this delay remaining is played back, it is necessary to synchronize the video and audio with the subtitles, and every time special playback (for example, the transport stream is played back and forth) There is a problem that it is necessary to wait for an image every time the stream is interrupted.

JP 2005-286969 A

  As described above, in a conventional broadcast receiving apparatus, when a transport stream with a remaining delay is played back, it is necessary to synchronize video and audio with subtitles. There is a problem that it is necessary to wait for an image every time the stream is interrupted, for example, by playing a transport stream.

  In order to achieve the above object, in the present invention, a transport stream of a program in which captions are delayed by a delay time with respect to a video is input, and the transport stream is input from the input terminal. And correcting the presentation time stamp with respect to the subtitle packet so that the presentation time stamp is displayed earlier by the delay time, and the position of the subtitle packet in the transport stream is corrected with respect to the video packet having the same display timing. Subtitle delay correcting means for moving to a position that is closer to the position and a time that is positive with respect to PCR (PCR: Program Clock Reference), and the transport stream input from the subtitle delay correcting means as a recording medium Provided is a broadcast receiving apparatus including a recording control means for recording.

  In order to achieve the above object, according to the present invention, a transport stream of a program in which a caption is delayed by a delay time is input to a video, and a presentation time stamp is applied to the caption packet. And the position of the subtitle packet in the transport stream is a position closer to a video packet having the same display timing and is a PCR (PCR: Program Clock). Provided is a broadcast receiving method comprising: a step of executing a process of moving to a position that becomes a plus time with respect to Reference) by a caption delay correcting unit; and a step of recording the corrected transport stream on a recording medium .

And recording the corrected transport stream on a recording medium.
The present invention relating to the apparatus is also established as an invention relating to a method, and the present invention relating to a method is also established as an invention relating to an apparatus.
Further, the present invention relating to an apparatus or a method has a function for causing a computer to execute a procedure corresponding to the invention (or for causing a computer to function as a means corresponding to the invention, or for a computer to have a function corresponding to the invention. It can also be realized as a program (for realizing the program), and can also be realized as a computer-readable recording medium on which the program is recorded.

The figure for demonstrating the structure of the broadcast receiving apparatus to which this invention is applied. The figure for demonstrating the correction method of this invention. The flowchart for demonstrating the correction method of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a broadcast receiving apparatus of the present invention having a caption display correction function.
In FIG. 1, an antenna 1 receives a broadcast wave.
The tuner 2 demodulates the MPEG2-TS transmitted at a desired frequency from the broadcast wave received by the antenna 1 and outputs it to the MPEG2-TS separation unit 3.
The MPEG2-TS separation unit 3 separates a video PES (PES: Packetized Elementary Stream), subtitle PES, and audio PES related to a program of a desired channel from the MPEG2-TS input from the tuner 2, and converts the video PES into a video delay unit. 11. The subtitle PES is output to the subtitle decoder 21 and the audio PES is output to the audio delay unit 31.

  Also, the MPEG2-TS separation unit 3 separates the PCR packet from the MPEG2-TS input from the tuner 2 and outputs the separated PCR packet to the PCR detection unit 51.

  For example, the caption delay detection unit 41 detects the delay time of the caption for the video from the audio PES and the caption PES. Delay information including the delay time detected by the caption delay detection unit 41 is output to the video delay unit 11 and the audio delay unit 31. As a method for detecting the delay time of subtitles for video from audio and subtitles, various known techniques may be used, and any technique may be used. For example, Japanese Patent Laying-Open No. 2005-286969 in Patent Document 1 discloses a method for detecting a delay time of a caption by comparing audio and caption.

  The video delay unit 11 adds the delay time included in the delay information input from the caption delay detection unit 41 to the video PTS (PTS: Presentation Time Stamp), and after buffering the video PES by the delay time, Output to the video decoder 12.

  The audio delay unit 31 adds the delay time included in the delay information input from the caption delay detection unit 41 to the audio PTS and buffers the audio PES by the delay time.

  The STC counter 52 is a counter in which a count value corresponding to the PCR value input from the PCR detection unit 51 is set, and a predetermined clock is counted in addition to the count value. The count values counted by the STC counter 52 are output to the video decoder 12, the caption decoder 21, and the audio decoder 32, respectively.

  The video decoder 12 receives the video PES which is added by the PTS delay time from the video delay unit 11 and is delayed by the delay time, and the count value input from the STC counter 52 and the PTS are obtained by decoding the MPEG2 decoded video. Output to the mixer 13 at the coincidence timing.

  The subtitle decoder 21 receives the subtitle PES from the MPEG2-TS separator 3 and outputs the decoded subtitle to the mixer 13 at the timing when the count value input from the STC counter 52 matches the PTS.

  The mixer 13 superimposes (multiplexes) the subtitle decoded by the subtitle decoder 21 on the video decoded by the video decoder 12, and outputs the video on which the subtitle is multiplexed to the monitor 14 via a video output terminal (not shown). To do. The present invention may be applied to a broadcast receiving apparatus in the form of a set top box, and the monitor 14 is not essential.

  The audio decoder 31 receives the audio PES which is added by the PTS delay time from the audio delay unit 31 and is delayed by the delay time, and the count value input from the STC counter 52 matches the PTS of the decoded audio. Is output to the speaker 33 at the timing of

  The PCR detection unit 51 detects a PCR (PCR: Program Clock Reference) value from the PCR packet input from the MPEG2-TS separation unit 3, and outputs this PCR value to the STC counter 52.

  As a result, the video data is output to the monitor 14 when the STC counter value and the video PTS match, the audio data is output from the speaker 33 when the STC counter value and the audio PTS match, and the caption data is the STC counter value. And the subtitle PTS are output to the monitor 14 at the same timing.

  Here, when recording a program, the MPEG2-TS output from the tuner is recorded in the recording / reproducing device 62. When reproducing the recorded program, the MPEG2-TS is read out from the recording / reproducing device 62, and the MPEG2-TS separating section 3 is read. Play by sending to.

  At the time of this recording / reproduction, it is assumed that a caption delay correcting device 61 (to be described later) is not provided and that MPEG2-TS is simply recorded / reproduced. When the subtitle display timing is delayed from the video, the video PES and the audio PES are reproduced with a delay by the video delay unit 11 and the audio delay unit 31. Thus, when the subtitle display timing of the program is delayed from the video, there is a problem that the video output delay occurs longer by the delay time of FIG. 2 every time special playback is performed.

  In this embodiment, a caption delay correcting device 61 is provided in front of the recording / reproducing device 62, and MPEG2-TS subjected to the caption delay correcting process shown in FIG. When reproducing from the recording / reproducing apparatus 62 by reproducing the MPEG2-TS subjected to the subtitle delay correction by the subtitle delay correcting apparatus 61, no delay occurs in the video delay unit 11 and the audio delay unit 31. Even if special playback is performed by the device 62, there is an effect that no further delay of video output occurs. Note that the case of real-time viewing is not different from the case where the caption delay correcting device 61 is not provided as described above.

Hereinafter, the correction processing by the caption delay correcting device 61 will be described in detail with reference to FIGS.
In FIG. 2, video 1, video 2,..., Video N indicate video data on MPEG-TS, audio 1 indicates audio data (packet), and subtitle 1 indicates subtitle data (packet). .

  Here, it is assumed that the display timing of subtitle 1 should be essentially the same as the display timing of video 1. In other words, a delay time occurs because subtitles are inserted in real time using a voice recognition technique or the like in live broadcasting, but when this delay time is eliminated, the display timing of subtitle 1 is the same as the display timing of video 1 And are displayed at the same time.

The subtitle 1 is located behind the video 1 in terms of time, and the PTS of the subtitle 1 is obtained by adding the delay time to the PTS of the video 1.
As for the delay time for delaying by the caption delay correcting device 61, the delay time of the same program detected by the caption delay detecting unit 41 at the same time when the program is recorded may be used. A predetermined value may be given to the ROM or the like.

  Subtitle data is corrected by subtracting the delay time from the PTS of subtitle 1 to make a new subtitle 1 PTS, and then re-multiplexing it after the video 1 having the same PTS as the PTS with the corrected subtitle 1 position. This process is performed for all subtitle data in which a delay has occurred.

  Since the data corrected by the caption delay correcting device 61 is considered to have no difference in the display timing of the video and the caption, when the data is reproduced from the recording / reproducing device 62, the data in the video delay unit 11 and the audio delay unit 31 Stop delay processing (delay time 0). As a result, there is no delay between the video delay unit 11 and the audio delay unit 31, and therefore there is no video output delay even if special playback is performed.

  According to the present embodiment, for example, when recording a program in which captions are delayed with respect to video, such as generating and multiplexing captions in real time in a live broadcast, as shown in FIG. (PTS) is corrected so that it is displayed earlier (step S301), and the position of the caption data is moved closer to the video data having the same display timing and to a position that is a plus time with respect to the PCR. Rearrangement is performed (step S302), and thereafter, recording is performed on a recording medium. Note that the order of steps S301 and S302 may be switched.

  As a result, a stream with no delay between video and audio and subtitles is recorded, so that the delay time for synchronization between video and audio and subtitles during playback can be reduced. Since it is possible to reduce the time until data is waited for, special playback can be executed without waiting for an image to be output every time special playback is performed.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined. For example, the first embodiment and the second embodiment may be combined and a genre and a channel may be combined as desired program attributes.

  DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Tuner, 3 ... MPEG2-TS separation part, 11 ... Video delay part, 12 ... Video decoder, 13 ... Mixer, 14 ... Monitor, 21 ... Subtitle decoder, 31 ... Audio delay part, 32 ... Audio decoder , 33... Speaker, 41... Subtitle delay detection unit, 51... PCR detection unit, 52... STC counter, 61.

Claims (5)

An input end to which a transport stream of a program in which subtitles are delayed by a delay time with respect to video is input;
The transport stream is input from the input end, the presentation time stamp is corrected with respect to the subtitle packet to be displayed earlier by a delay time, and the position of the subtitle packet in the transport stream is corrected. Subtitle delay correction means for moving to a position closer to a video packet having the same display timing and a time that is a plus time with respect to PCR (PCR: Program Clock Reference),
A broadcast receiving apparatus comprising: a recording control unit that records the transport stream input from the subtitle delay correcting unit on a recording medium. Further, a subtitle delay detection unit that detects the delay time that the subtitle is delayed with respect to the video from the transport stream of the program input from the input end,
2. The broadcast receiving apparatus according to claim 1, wherein the subtitle delay correcting unit corrects a presentation time stamp for the subtitle packet so that the presentation time stamp is displayed earlier by the delay time detected by the subtitle delay detection unit. Separating means for inputting the transport stream from the input end, and separating video data and caption data from the transport stream;
A subtitle decoder for decoding the subtitle data separated by the separation means;
A video delay unit that delays the video data separated by the separation means by the delay time;
A video decoder for decoding the video data delayed by the video delay unit;
The broadcast receiving apparatus according to claim 1, further comprising: a mixer that mixes and outputs a subtitle from the subtitle decoder to a video from the video decoder. Furthermore, a reproducing means for reproducing the transport stream recorded on the recording medium is provided,
When the playback means is playing back,
The separating means separates the video data and the caption data from the transport stream reproduced by the reproducing means instead of the transport stream from the input end,
The broadcast receiving apparatus according to claim 1, wherein the video delay unit delays the delay time by 0 or a time shorter than the delay time. A transport stream of a program in which subtitles are delayed by a delay time with respect to the video is input, and the presentation time stamp is corrected to be displayed earlier by the delay time with respect to the subtitle packet, and the Processing for moving the position of the subtitle packet in the port stream to a position that is closer to a video packet having the same display timing and that is a plus time with respect to PCR (Program Clock Reference). Executing by the caption delay correcting means;
And a step of recording the corrected transport stream on a recording medium.

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