Method and apparatus for unscrambling sync-suppressed television

Details Method and apparatus for unscrambling sync-suppressed television Method and apparatus for unscrambling sync-suppressed television

1984-10-29

1987-12-08

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 20, H04N 7167

Patent

active

047122374

ABSTRACT:
A TV signal decoder including a pair of flipflops, for receiving vertical sync signals identified by a single vertical blanking pulse in field No. 1 and a pair of pulses in field No. 2, includes a time delay circuit for operating the second flipflop only in response to the two pulse field. The outputs of the flipflop are coupled to a pair of AND gates and are supplied with decoding information that is serially translated under control of the appropriate field signal for decoding the television signal. A counter identifies the horizontal line number and is coupled to a PROM where the decoding information is stored for a specific scrambling system. The PROM may be replaced to enable operation with a different scrambling system.

REFERENCES:
patent: 4307416 (1981-12-01), Spano
patent: 4471380 (1984-09-01), Mobley
patent: 4523228 (1985-06-01), Banker
Popular Electronics, May 1979, "The Upcoming New World of T.V. Reception", by Leslie Solomon.

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