Video scrambling by the application of a variable periodic scrambling waveform
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United States of America Patent
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Feb 4, 1986
Grant Date -
N/A
app pub date -
Oct 28, 1982
filing date -
Oct 28, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A means for scrambling video signals by the application of a periodic scrambling waveform which has the effect of altering the normal amplitude relationship between horizontal sync and the video picture portion of a horizontal line uses the comparison between the brightness level of the video signal during a predetermined time period with a reference as a means for varying the amplitude of the periodic scrambling waveform.
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