Methods and systems for independently controlling the...

Details Methods and systems for independently controlling the... Methods and systems for independently controlling the...

2005-10-12

2009-02-24

Natnael, Paulos M (Department: 2622)

Television

Synchronization

Locking of video or audio to reference timebase

Reexamination Certificate

active

07495705

ABSTRACT:
A digital receiver contains a local video clock that controls the video presentation speed and a local audio clock that controls the audio presentation speed separately and independently of the video presentation speed. To control the video presentation speed, a comparator compares a program clock reference in a video packet with a local time. A video clock controller then speeds up or slows down the video clock as needed to be back on schedule. To control the audio presentation speed, a comparator compares a program clock reference in an audio packet with the local time. An audio clock controller then speeds up or slows down the audio clock as needed to be back on schedule.

REFERENCES:
patent: 5072832 (1991-12-01), Valentine et al.
patent: 6275267 (2001-08-01), Kobayashi
patent: 6744815 (2004-06-01), Sackstein et al.
patent: 6975363 (2005-12-01), Baldwin et al.

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