Adaptive video descrambling system
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United States of America Patent
Stats
-
Dec 31, 1985
Grant Date -
N/A
app pub date -
Jun 14, 1983
filing date -
Jun 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A television signal is scrambled by suppressing horizontal and vertical synchronizing signals while leaving unsuppressed a reference level during a selected reference interval. Descrambling of the received scrambled signal is achieved by comparing the unsuppressed reference level with the suppressed synchronizing signals and by adding a level representative of that comparison to the suppressed synchronizing signals, thereby to restore the latter to their proper levels.
First Claim
Family
International Classification(s)
Cited Art Landscape
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