System and method for detection of a pulse within a video signal
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United States of America Patent
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Nov 24, 1992
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N/A
app pub date -
Sep 20, 1991
filing date -
Aug 6, 1990
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Expired
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Abstract
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal of a frame-by-frame basis and for decrypting encrypted PCM audio information which is transmitted along with the aperiodically inverted video information.
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