Remote control TV subcarrier phase shifter system

Details Remote control TV subcarrier phase shifter system Remote control TV subcarrier phase shifter system

1979-03-26

1981-05-05

Heyman, John S.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 35, 307262, 328155, H03K 5159

Patent

active

042661978

ABSTRACT:
The remote control of the subcarrier phase at each of a plurality of television cameras is provided by a digital encoder located near a remote monitor and camera switching network location. The encoder transmits binary coded signals to a color subcarrier phase shifter in the separate cameras. For the coarse phase selection, a first binary code signal selects a tap point along a delay line. For fine phase selection, a second binary code signal is decoded to provide D.C. voltage amplitude levels. These D.C. voltage levels are applied to a pair of comparators. The output from the tapped delay line is also applied to the comparators. The phase of the output from the comparators is advanced or retarded in direct correspondence to the amplitude level and polarity of the D.C. voltages applied to the comparators.

REFERENCES:
patent: 3626306 (1971-12-01), Puckett
patent: 3636477 (1972-01-01), Selz
patent: 3906247 (1975-09-01), Heffner
patent: 4013969 (1977-03-01), Dennison

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