Cryptography – Key management – Having particular key generator
Patent
1985-01-02
1989-03-21
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 17, 380 20, H04N 7167
Patent
active
048151297
ABSTRACT:
An encrypted video distribution system includes a signal originating station which distributes television signals in a format unrecoverable by a standard television receiver. In particular, the normally occurring vertical and horizontal synchronizing pulses are deleted and, optionally also, video information is selectively inverted about a voltage reference potential intermediate the black and white levels. To permit synchronization restoration, a keying pulse is transmitted once each video field, and a synchronizing digital code burst transmitted once each frame--all at a fixed, predetermined intra-frame timed relationship. At each authorized subscriber location, the keying pulse and digital code burst are employed to lock a receiver frame clock which derivatively gives rise to all requisite reception-permitting synchronizing pulses. The transmitted information also contains information sufficient to restore the inverted video program content.
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Glaab Joseph
Griffin John
Grubb David
Buczinski Stephen C.
General Instrument Corp.
Wallace Linda J.
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