Video scrambling system

Details Video scrambling system Video scrambling system

1974-07-01

1977-07-05

Buczinski, S.C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325144, 358118, 358121, H04N 144

Patent

active

040344029

ABSTRACT:
A system for scrambling and descrambling the video portion of a television signal. At the transmitting end, the video is scrambled by shifting the phase angle of the carrier relative to that of the sidebands a constant amount. At each receiving site, the signal is unscrambled by locally deriving from the phase shifted carrier a carrier of the proper frequency, phase angle and amplitude. The locally generated carrier is then vector summed with the incoming phase shifted carrier to produce a carrier having proper phase angle.

REFERENCES:
patent: 1935776 (1933-11-01), Hammond, Jr.
patent: 3084329 (1963-04-01), Clay
patent: 3180927 (1965-04-01), Heppe et al.
patent: 3500250 (1970-03-01), Frerking
patent: 3852519 (1974-12-01), Court
patent: 3857997 (1974-12-01), Toonder
patent: 3982062 (1976-09-01), Simons

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