Video encryption system

Details Video encryption system Video encryption system

H - Electricity

04

N

350/20, 350/29

H04N 7/16 (2006.01) H04N 7/167 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1225735

VIDEO ENCRYPTION SYSTEM ABSTRACT OF THE DISCLOSURE 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/non-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.

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