Color-difference signal processing circuits

Details Color-difference signal processing circuits Color-difference signal processing circuits

1980-03-03

1981-06-09

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 30, H04N 950, H04N 952

Patent

active

042727782

ABSTRACT:
A first resistive current path is DC connected between respective output terminals of push-pull color demodulator. A second resistive current path is DC connected between respective output terminals of a second push-pull color demodulator. An output color-difference signal is formed by a differential amplifier having one input DC connected to an asymmetrically positioned point in first resistive current path, and a second input DC connected to an asymmetrically positioned point in second resistive current path. Output color-difference signal corresponds to a combination of the demodulated signals, with a polarity relationship and magnitude ratio determined by the asymmetry of positioning of the takeoff points in the respective current paths. Output quiescent voltage is independent of the asymmetry of positioning of the takeoff points.

REFERENCES:
patent: 2857457 (1958-10-01), Richman
patent: 2922838 (1960-01-01), Torre
patent: 3340355 (1967-09-01), Richman
RCA Linear Integrated Circuits Brochure File No. 688, entitled CA 3121G TV Chrome Amplifier/Demodulator, published by RCA Solid State Division, Nov. 1977.

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