Video picture signal scrambling system

Details Video picture signal scrambling system Video picture signal scrambling system

1986-09-30

1988-05-03

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 10, H04N 7167

Patent

active

047425458

ABSTRACT:
A video picture signal scrambling system for subscription braodcast or cablecast television systems which can scramble video signals without adversely effecting pictures received at a subscriber's terminal. The system includes a detector for detecting the brightness level of the picture signal over a predetermined interval, a comparator for comparing the brightness level with a first predetermined reference value and a scrambling circuit responsive to the comparator for inhibiting reversion of the picture signal when the brightness level exceeds the first reference value, and for selectively reversing the picture signal in response to changes in the brightness level in successive intervals of the picture signal.

REFERENCES:
patent: 4308556 (1981-12-01), Osaka
patent: 4340906 (1982-07-01), den Toonder et al.
patent: 4429331 (1984-01-01), Kanai
patent: 4599648 (1986-07-01), Fujii et al.

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