Horizontal pulse augmentation of a video signal

Details Horizontal pulse augmentation of a video signal Horizontal pulse augmentation of a video signal

1993-04-20

1995-02-28

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 15, H04N 7167

Patent

active

053944704

ABSTRACT:
Augmenting pulses are added to the horizontal sync pulse intervals of a video signal to prevent a copy of the thus modified video signal from being satisfactorily displayed. The magnitude of the augmenting pulses is chosen so that the modified signal containing these pulses can be displayed without distortion. When the modified video signal is recorded and then reproduced by a typical VCR (i.e., when the modified video signal is copied), attenuation of the augmenting pulses and the remaining portions of the horizontal sync pulse occurs so that a television receiver cannot properly detect horizontal sync in the copied modified video signal, resulting in an unsatisfactory display.

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