Television – Synchronization – Locking of video or audio to reference timebase
Reexamination Certificate
2005-02-01
2005-02-01
Kostak, Victor R. (Department: 2614)
Television
Synchronization
Locking of video or audio to reference timebase
C348S515000
Reexamination Certificate
active
06850284
ABSTRACT:
To ensure synchronization of audio and video decoding operations, the decoding of encoded video information is slaved to the decoding of encoded audio information using the frame-based timing structure of encoded audio information. In one embodiment, time stamps are associated with the encoded audio and video information, which time stamps are encoded in the respective audio and video information relative to a common time reference. At the decode side, the encoded video information is decoded only when an audio time stamp compares favorably with an audio time stamp, e.g., the video time stamp is not greater than the audio time stamp. Otherwise, the encoded video information is not decoded until such time that its video time stamp compares favorably with a subsequent audio time stamp. Using the techniques of the present invention, audio/video synchronization is achieved without the need for a decode-side system timer or delay circuitry.
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Gries Patrick J.
Stroming James W.
Kostak Victor R.
Motorola Inc.
Vedder Price Kaufman & Kammholz P.C.
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