Video scrambler and descrambler apparatus

Details Video scrambler and descrambler apparatus Video scrambler and descrambler apparatus

1976-02-03

1977-12-20

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358120, 358121, H04N 144

Patent

active

040645363

ABSTRACT:
Video signals for television are effectively scrambled and may later be descrambled without the presence of annoying visual disturbances by the introduction of a superposed distorted sine wave in synchronism with the horizontal synchronizing signal, in a "gray sync" mode of operation. Thereafter, the received signal may be normalized and descrambled by compensatory and synchronous modulation. Advantageously, the sinusoidal variation may be imposed both upon aural and visual components of the signal, and the aural AM signal may be utilized as a reference in descrambling the visual component.

REFERENCES:
patent: 3081376 (1963-03-01), Loughlin et al.
patent: 3729576 (1973-04-01), Court
patent: 3936593 (1976-02-01), Aaronson et al.

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