Method for developing a key signal for descrambling in televisio

Details Method for developing a key signal for descrambling in televisio Method for developing a key signal for descrambling in televisio

1983-06-30

1988-12-27

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 20, 380 21, 380 33, 380 34, 380 45, 380 47, H04N 767

Patent

active

047946431

ABSTRACT:
A scrambling method for TV pictures avoids deterioration of the reproduced picture by level compressing only selected horizontal flyback portions according to a randomly selected pattern to prevent synchronization at the receiver. Key signals are added repetitively to a plurality of horizontal synch signals in one frame so as to enable descrambling of the picture at the decoder, even if noise or data error interferes with one or more of the signals.

REFERENCES:
patent: 2603714 (1952-07-01), Meacham
patent: 4319273 (1982-03-01), Nossem

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