Time window key system for video scrambling

Details Time window key system for video scrambling Time window key system for video scrambling

1982-01-21

1984-08-07

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

34082534, 358117, 358123, 358124, H04N 716, H04K 104

Patent

active

044646780

ABSTRACT:
A video scrambling device requires that a key signal be periodically inserted into a subscribers box, e.g. once a month. The key signal is a function of both the box number and the time, and thus once received must be inserted relatively quickly, e.g. an hour or two. If it is not inserted quickly, a new key signal must be obtained. This makes it extremely difficult for a pirate to distribute a key signal to his customers in time for it to be effective. The scrambling method can be pseudorandom line inversion and also audio scrambling.

REFERENCES:
patent: Re28701 (1976-01-01), Edwards et al.
patent: 4081832 (1978-03-01), Sherman
patent: 4225884 (1980-09-01), Block et al.
patent: 4430669 (1984-02-01), Cheung

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