Video signal descrambling apparatus

Details Video signal descrambling apparatus Video signal descrambling apparatus

1996-08-06

1998-06-16

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 10, 380 17, 380 20, H04N 7167

Patent

active

057683778

ABSTRACT:
A video signal descrambling apparatus capable of restoring a scrambled video signal transmitted from a cable television or commercial broadcasting system to the original standard video signal to permit subscribers to enjoy the scrambled signal and to provide a selective video service to the subscribers. According to the apparatus, a sync signal and information data are separated from the scrambled video signal, and control signals are generated based on the separated sync signal and the data. The artificial sync signal inserted in the scrambled video signal is removed in accordance with the control signal, and the attenuated sync signal in the scrambled video signal is restored to the original sync signal, so that the descrambling of the scrambled video signal is completed.

REFERENCES:
patent: 4323922 (1982-04-01), Den Toonder et al.
patent: 4424532 (1984-01-01), Den Toonder et al.
patent: 4575755 (1986-03-01), Schoeneberger et al.
patent: 4815129 (1989-03-01), Griffin et al.
patent: 5319709 (1994-06-01), Raiser et al.

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