Clock correction in a video data decoder using video synchroniza

Details Clock correction in a video data decoder using video synchroniza Clock correction in a video data decoder using video synchroniza

1994-06-07

1995-12-05

Kostak, Victor R.

Television

Synchronization

348536, 348537, 348464, H04N 504

Patent

active

054733855

ABSTRACT:
In a system which encodes video data in response to an encoding clock, transmits the encoded video data with an encoder clock signal representing the encoding clock frequency, and decodes the video data in response to a decoding clock, system clock accuracy is maintained by adjusting the decoding clock frequency. In order to reduce buffer requirements and to prevent deterioration of video program presentation, the decoding clock frequency is adjusted by slewing only during composite video synchronization periods when composite video decoded from the encoded video stream is not being presented. The preferred video synchronization periods are the vertical blanking interval and the front porch period. Restriction of decoding clock rate adjustment to these periods ensures that decoding clock slew rate limits may be unrestricted, thereby avoiding noticeable effects in the video program presentations.

REFERENCES:
patent: 5025258 (1991-06-01), Duttweiler
patent: 5031053 (1991-07-01), Chamzas
patent: 5148271 (1992-09-01), Kato

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