Video scrambling with variable function generator

Details Video scrambling with variable function generator Video scrambling with variable function generator

1995-05-19

1997-09-23

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 15, 380 20, H04N 7167

Patent

active

056712782

ABSTRACT:
A video scrambling and descrambling arrangement utilizes plural scrambling characteristics including a predetermined scrambling waveform and a selectable one of a plurality of phase relationships with respect to the video signal to be scrambled. Descrambling is achieved by combining with the scrambled video signal a correspondingly phase shifted, inverted version of the scrambling signal. Scrambling and descrambling can be implemented in analogue or digital forms. The information required to achieve descrambling is contained in the scrambled video signal, preferably in an unscrambled portion thereof.

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patent: 4313133 (1982-01-01), Fukushima
patent: 4424532 (1984-01-01), Toonder et al.
patent: 4454543 (1984-06-01), Lund et al.
patent: 5142574 (1992-08-01), West, Jr. et al.

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