Video scrambling by the application of a variable periodic scram

Details Video scrambling by the application of a variable periodic scram Video scrambling by the application of a variable periodic scram

1982-10-28

1986-02-04

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358118, 358120, 358123, 358124, H04N 716, H04K 102

Patent

active

045689741

ABSTRACT:
A means for scrambling video signals by the application of a periodic scrambling waveform which has the effect of altering the normal amplitude relationship between horizontal sync and the video picture portion of a horizontal line uses the comparison between the brightness level of the video signal during a predetermined time period with a reference as a means for varying the amplitude of the periodic scrambling waveform.

REFERENCES:
patent: 4308556 (1981-12-01), Osaka
patent: 4353088 (1982-10-01), Toonder et al.
patent: 4447828 (1984-05-01), Toonder
patent: 4454543 (1984-06-01), Lund et al.

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