Video encryption system

Details Video encryption system Video encryption system

1983-06-10

1986-07-01

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 358178, H04N 7167, H04N 553

Patent

active

045983186

ABSTRACT:
An encrypted video distribution system includes a signal-originating head end for scrambling outgoing television program-bearing signals. In particular, the video content of selected lines is inverted about a reference voltage level, and the inversion reference level amplitude transmitted in pulse form during the horizontal synchronizing pulse interval. Line video inversion
on-inversion is controlled by a keyed pseudo random generator.
At each authorized subscriber location, all inverted lines are restored to proper format, using the accompanying received inversion amplitude level present during horizontal sync as a reference. A pseudo random generator is included in the receiver descrambling circuitry and operates in a sequence identical to the like circuit at the head end to identify those lines requiring video inversion.

REFERENCES:
patent: 3824332 (1974-07-01), Horowitz
patent: 3835248 (1974-09-01), Harford
patent: 3985954 (1976-10-01), Kuniyoshi et al.
patent: 4318126 (1982-03-01), Sassler
patent: 4369466 (1983-01-01), Matsuzaki et al.
patent: 4396947 (1983-08-01), Cheung

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