Television signal scrambling method and apparatus

Details Television signal scrambling method and apparatus Television signal scrambling method and apparatus

1990-10-29

1992-06-23

Swann, Tod

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 15, 380 7, 380 43, H04N 7167

Patent

active

051250284

ABSTRACT:
A television scrambling system of the GSS type includes a false key signal to defeat pirate decoders. The false key is placed approximately one half a horizontal line period following the last horizontal sync pulse preceding the vertical blanking interval of the television signal. If the pirate decoder is set to attenuate the video portion of the picture signal in response to receipt of a standard GSS scrambled signal, the pirate decoders will attenuate only the sync portion of the picture signal in response to a signal scrambled with the false key.

REFERENCES:
patent: 2567539 (1951-09-01), Aram
patent: 4466017 (1984-08-01), Banker
patent: 4771455 (1988-09-01), Hareyama et al.
patent: 4794643 (1988-12-01), Saeki et al.
patent: 4953208 (1990-08-01), Ideno

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