Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1996-09-25
1999-11-09
Lee, Michael H.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348565, 348567, 348718, H04N 5911
Patent
active
059824530
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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Desir Jean W.
Lee Michael H.
Thomson Consumer Electronics Inc.
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