Video signal scrambling apparatus

Details Video signal scrambling apparatus Video signal scrambling apparatus

1996-08-06

1998-06-16

Barron, Jr., Gilberto

Cryptography

Key management

Having particular key generator

380 20, H04N 7171

Patent

active

057683760

ABSTRACT:
A video signal scrambling apparatus which scrambles a video signal in a cable or commercial broadcasting system to prevent nonsubscribers from viewing the signal and the unwarranted descrambling of the signal. The scrambling apparatus scrambles the video signal in such a manner that a predetermined period of a sync signal is selectively inverted and attenuated, and then an artificial sync signal is inserted into the video signal in which the sync signal is inverted and attenuated, causing the horizontal sync period to be irregular.

REFERENCES:
patent: 5142575 (1992-08-01), Farmer et al.
patent: 5161188 (1992-11-01), Pires
patent: 5177787 (1993-01-01), Murphy et al.
patent: 5402488 (1995-03-01), Karlock
patent: 5410601 (1995-04-01), Hashimoto
patent: 5438620 (1995-08-01), Ryan et al.

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