Television – Image signal processing circuitry specific to television – A/d converters
Reexamination Certificate
2005-03-24
2008-12-30
Kostak, Victor R (Department: 2622)
Television
Image signal processing circuitry specific to television
A/d converters
C348S536000, C348S714000
Reexamination Certificate
active
07471340
ABSTRACT:
A video quality adaptive variable-rate buffering method and system for stabilizing a sampled video signal reduces the buffer size required to compensate for line-to-line variations in an unstable video source. A video signal is sampled at a predetermined rate and decimated by a selectable decimation factor prior to buffering. By selecting different decimation factors, the effective length of the buffer is changed from short duration for stable input signals and to longer duration for unstable input signals. A video signal quality detector is employed to provide a selection input that adjusts the decimation factor and also the loop bandwidth of a clock generator that provides the output clock for the buffer, which is generated from the input signal via a phase-lock loop (PLL). The operation of the system automatically varies from highly responsive for stable video input signals to less responsive for unstable video input signals, providing improved stability in the video output.
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Antone James A.
Chowdhury Ahsan
Melanson John L.
Singh Rahul
Cirrus Logic Inc.
Harris Andrew M.
Harris, Atty at Law, LLC Mitch
Kostak Victor R
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