Video scrambling, audio masking and data transmission methods fo

Details Video scrambling, audio masking and data transmission methods fo Video scrambling, audio masking and data transmission methods fo

1990-05-07

1991-10-22

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 6, 380 10, 380 12, 380 15, 380 17, 380 20, H04N 7167

Patent

active

050602624

ABSTRACT:
Video scrambling is accomplished by attenuating the video carrier during the horizontal blanking interval and/or by omitting horizontal sync pulses, vertical serration pulses and equalizing pulses. The method of scrambling can be dynamically changed, but this is done only at the change of scenes. Audio masking and data transmission is accomplished via phase modulation of the video carrier. At the receiver, timing signals for unscrambling video and unmasking audio are obtained from the transmitted data. The system addresses problems that exist in wireless cable systems, but are not present in cabled systems.

REFERENCES:
patent: 4706284 (1987-11-01), Citta et al.
patent: 4802213 (1989-01-01), Citta et al.

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