Television signal encryption system with protected audio

Details Television signal encryption system with protected audio Television signal encryption system with protected audio

1983-06-10

1986-12-09

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358124, H04N 7167

Patent

active

046283587

ABSTRACT:
An encrypted video distribution system includes a signal-originating head end for scrambling the audio portion of outgoing television program-bearing signals. In particular, the audio content of a television program alternately reverses polarity under control of a keyed pseudo random generator. At each authorized subscriber location, a pseudo random generator is included in receiver descrambling circuitry and operates in a sequence identical to the like circuit at the head end to restore the polarity-inverted audio signal, thereby permitting reception and presentation of intelligible audio subject matter.
In accordance with another aspect of the present invention, the video information present during selected lines is inverted about a predetermined inversion level and restored at equipped, authorized subscriber stations also under control of the pseudo random generators.

REFERENCES:
patent: 2953643 (1960-09-01), Koenig, Jr.
patent: 3610828 (1971-10-01), Girard et al.
patent: 3824332 (1974-07-01), Horowitz
patent: 4318126 (1982-03-01), Sassler
patent: 4396947 (1983-08-01), Cheung

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