Audio signal cryptographic system

Cryptography – Key management – Having particular key generator

Patent

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380 28, H04N 7167

Patent

active

052673120

ABSTRACT:
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which is transmitted along with the aperiodically inverted video information.

REFERENCES:
patent: 4694491 (1987-09-01), Horne
patent: 4739510 (1988-04-01), Jeffers et al.

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