Reduction of visibility of spurious signals in video
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United States of America Patent
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-
Nov 9, 1999
Grant Date -
N/A
app pub date -
Sep 25, 1996
filing date -
Sep 25, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system and method for altering the appearance of interference in a video signal caused by spurious interference generated by repeated high speed digital memory write operations affecting video processing in analog circuitry in thereceiver. In one particular embodiment, a picture-in-picture television receiver is provided wherein both the main and sub-pictures are processed on a single IC including analog processing circuitry, as well as a small picture memory array to which small picture video samples are repeatedly being written. The visibility of spurious interference in the picture is reduced by periodically altering the clock timing during the repetitive high speed writing operation to redistribute the interference so as to be less noticeable to the television viewer.
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