Cryptography – Key management – Having particular key generator
Patent
1991-09-20
1993-02-09
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 15, H04N 7167
Patent
active
051857944
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: 3919462 (1975-11-01), Hartung et al.
patent: 4081832 (1978-03-01), Sherman
patent: 4245246 (1981-01-01), Cheung
patent: 4307416 (1981-12-01), Spano
Hunting C. J.
Phipps William L.
Raynesford Steven J.
Rittmueller Philip H.
Thompson John R.
Buczinski Stephen C.
NEC Home Electronics Ltd.
Ogonowsky Brian D.
Shoup Guy W.
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