Scrambling and descrambling of television signals for subscription TV
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 11, 1984
Grant Date -
N/A
app pub date -
Mar 15, 1982
filing date -
Mar 15, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Subscription TV premium programming may be encoded with tagging information as by transmitting a tagging pulse during at least one horizontal line interval of each picture field in addition to pulses which are used to time the restoration of horizontal sync in the descrambler of a sync suppressed scrambling system. The additional tagging pulses provide information necessary to enable or disable the descrambler, and thereby provide high level encoding with minimum hardware complexity.
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