Process and circuit layout for the recognition of an identification sign (signum) contained in a video signal
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United States of America Patent
Stats
-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Sep 29, 1988
filing date -
Sep 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Circuitry for recognizing an authorization code included in a video signal for enabling a subscriber's television receiver, includes quantizing apparatus for coarsely quantizing the received signal. A correlator designed to recognize the authorization code is coupled the quantizer and produces an array of correlation values. The correlation values are coupled to a threshold circuit which converts the correlation values to bistate values. Further circuitry evaluates the distribution of bistate values to determine reception of the authorization code.
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Family
International Classification(s)
Cited Art Landscape
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