Subscription television system

Details Subscription television system Subscription television system

1982-09-08

1985-08-06

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358119, 360 27, H04N 716, H04K 104

Patent

active

045339490

ABSTRACT:
In a subscription television system, only a video signal for a specific program is scrambled in a television signal in accordance with a predetermined scrambling mode. A key signal, used for unscrambling the scrambled video signal, is generated in response to the scrambling mode. The key signal is transmitted after the scrambled program.

REFERENCES:
patent: 2857455 (1958-10-01), Jolliffe
patent: 4225884 (1980-09-01), Block et al.
patent: 4250524 (1981-02-01), Tomizawa
patent: 4354201 (1982-10-01), Sechet et al.
patent: 4389671 (1983-06-01), Posner et al.
patent: 4403252 (1983-09-01), Ragan et al.
patent: 4405942 (1983-09-01), Block et al.
patent: 4430669 (1984-02-01), Cheung

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