System for scrambling and descrambling video signals by altering

Details System for scrambling and descrambling video signals by altering System for scrambling and descrambling video signals by altering

1996-08-30

1999-11-02

Hayes, Gail O.

Cryptography

Key management

Having particular key generator

380 10, H04N 7171

Patent

active

059784806

ABSTRACT:
A system for scrambling and descrambling a composite video signal having content and an associated composite synchronization signal. The system comprises an apparatus for scrambling the composite video signal, an apparatus for recovering the composite video signal and a transmission apparatus for transmitting the scrambled composite video signal between the scrambling apparatus and the recovering apparatus. The apparatus for scrambling the composite video signal including a pseudo vertical synchronization signal generator, a pseudo horizontal synchronization signal generator, a combiner for combining the pseudo vertical and horizontal synchronization signals, and an adder for adding the combined pseudo vertical and horizontal synchronization signals into the composite video signal. The apparatus for recovering the composite video signal from the composite video signal with the added combined pseudo vertical and horizontal synchronization signals includes a locator for locating the associated composite synchronization signal in the composite video signal and a circuit for removing the added combined pseudo vertical and horizontal synchronization signals from the composite video signal.

REFERENCES:
patent: 4458268 (1984-07-01), Ciciora
patent: 4511919 (1985-04-01), Forgey
patent: 4527195 (1985-07-01), Cheung
patent: 4594609 (1986-06-01), Romao et al.
patent: 4695901 (1987-09-01), Ryan
patent: 5272751 (1993-12-01), Kajita et al.
patent: 5561713 (1996-10-01), Suh
patent: 5754650 (1998-05-01), Katznelson

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