Television – Synchronization – Locking of video or audio to reference timebase
Patent
1997-07-28
1999-09-28
Lee, Michael H.
Television
Synchronization
Locking of video or audio to reference timebase
348500, 348512, 348423, 348845, H04N 762
Patent
active
059596848
ABSTRACT:
A method and apparatus for synchronizing the playback of audio and video frames from a program source. The method associates an audio presentation time stamp ("PTS") value with an output audio frame. Selected ones of audio and video data packets include respective audio and video PTS values representing desired playback times of the respective audio and data associated therewith. The selected ones of the audio data packets further include audio frame numbers representing a number of output frames of audio to be played back between the selected ones of the audio data packets. The method comprises the steps of first storing the audio and video PTS values in respective audio and video PTS tables during an audio demultiplexing process. In addition, the audio frame numbers are stored in frame counters in association with respective PTS values during the demultiplexing process. Thereafter, the process sequentially decodes the audio and video input data to produce respective frames of audio and video which are presented to the user. With the presentation of each audio and video frame, the respective audio and video frame counters are selectively decremented. Upon detecting one of the audio frame counters having a zero value, the audio PTS value for that zero value audio frame counter is retrieved. Thereafter, the playback of the audio and video frames is selectively modified so that frames of audio and video are played back in synchronization.
REFERENCES:
patent: 5396497 (1995-03-01), Veltman
patent: 5598352 (1997-01-01), Rosenau et al.
patent: 5642171 (1997-06-01), Baumgartner et al.
patent: 5661728 (1997-08-01), Finotello et al.
patent: 5668601 (1997-09-01), Okada et al.
patent: 5771075 (1998-06-01), Rim et al.
patent: 5808722 (1998-09-01), Suzuki
patent: 5812201 (1998-09-01), Yoo
patent: 5815634 (1998-09-01), Daum et al.
patent: 5841472 (1998-11-01), Rim et al.
Barry G. Haskell, et al., Digital Video: An Introduction to MPEG-2, Chapter 3, pp. 32-39, Chapman & Hall, 1997.
Tan Yew-Koon
Yu Gong-san
Desir Jean W.
Lee Michael H.
Sony Corporation
Sony Electronics Inc.
LandOfFree
Method and apparatus for audio-video synchronizing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for audio-video synchronizing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for audio-video synchronizing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-709330