Scrambling system for television sound signals

Details Scrambling system for television sound signals Scrambling system for television sound signals

1979-04-25

1981-05-05

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

179 15R, 179 15S, 358116, 358145, 358147, 358120, H04N 716, H04N 704, H04N 708

Patent

active

042662435

ABSTRACT:
An audio scrambler operates on segments of audio divided from a continuous audio signal to rotate head-to-tail the string of information contained in the segment by an amount which is at pseudo-random between the successive segments. When the segments are compressed to video format, the scrambled compressed audio signals are inserted into an unused line of the vertical blanking space of a television system for transmission with the video signals. The inserted audio is combined with decoy signals, also in the vertical blanking space to increase security of transmission. Concurrent scrambling of compressed audio signals and video signals is provided.

REFERENCES:
patent: 3731197 (1973-05-01), Clark
patent: 3773977 (1973-11-01), Guanella
patent: 3789137 (1974-01-01), Newell
patent: 3819852 (1974-06-01), Wolf
patent: 3824467 (1972-12-01), French
patent: 3872503 (1975-03-01), Shutterly
patent: 3925612 (1975-12-01), Guanella
patent: 4070693 (1978-01-01), Shutterly

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