Anti-copying video signal processing

Details Anti-copying video signal processing Anti-copying video signal processing

1989-12-27

1991-07-23

Buczinski, Stephen C.

Cryptography

Cryptanalysis

360 60, 380 14, 380 15, H04N 7167

Patent

active

050349813

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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