Method of scrambling television pictures and arrangement for des

Details Method of scrambling television pictures and arrangement for des Method of scrambling television pictures and arrangement for des

1983-08-29

1988-05-24

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 20, 380 10, H04N 7167

Patent

active

047471387

ABSTRACT:
Method of scrambling television pictures for which the video signals of each scanning line are of the M.A.C. type, that is to say time-division multiplexing of the analog chrominance and luminance components, characterized in that on transmission the components are each divided, in each line, one after the other, into two consecutive signals C and D, on the one hand, and F and G, on the other hand, the first signal C and F of which are then delayed for the duration of the second signal, and the second signals D and G are advanced for the duration of the first signals, the reference periods B and E which precede these respective components being excluded from this processing operation, the positions of the dividing points being derived from pseudo-random digital sequences, and the processing operation being intended to be applied on reception in the opposite sense for the simultaneous recovery of the luminance signal Y and the color difference signals U and V.

REFERENCES:
patent: 4070693 (1978-01-01), Shutterly
patent: 4335393 (1982-06-01), Pearson

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