Video signal scrambling and descrambling apparatus

Details Video signal scrambling and descrambling apparatus Video signal scrambling and descrambling apparatus

1994-04-15

1996-01-30

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 10, 380 19, 380 20, 380 43, 380 46, H04N 7167, H04L 902

Patent

active

054886589

ABSTRACT:
A common circuit is used for scrambling and descrambling video signals. A memory stores key data. During scrambling the output of the memory is transmitted to a read address counter through an address generating circuit. Scrambling is effected by executing line rotation from a cut point. Descrambling is effected by the reverse of the aforementioned process.

REFERENCES:
patent: 4547802 (1985-10-01), Fogarty et al.
patent: 5355409 (1994-10-01), Hirashima

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