Anti-copying video signal processing
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United States of America Patent
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-
Jul 23, 1991
Issued Date -
N/A
app pub date -
Dec 27, 1989
filing date -
Apr 11, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Counting circuitry in the vertical synchronizing circuit of a video receiver is prevented from generating vertical control signals at a fixed, standard periodicity when the video signal transmitted to that receiver exhibits a changing field interval which varies above and below that standard period. At least one of the vertical pulses in the vertical period of each field interval as well as plural equalizing pulses in the post equalizing period in that field interval are deleted from the video signal. To minimize perturbations in the video picture displayed from that video signal, the time of occurrence of the first vertical pulse in selected field intervals is shifted.
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