Cryptography – Key management – Having particular key generator
Patent
1991-09-20
1993-11-30
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
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.
Hunting C. J.
Phipps William L.
Raynesford Steven J.
Rittmueller Philip H.
Thompson John R.
Buczinski Stephen C.
NEC Home Electronics Ltd.
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