Color subcarrier generator

Details Color subcarrier generator Color subcarrier generator

1977-03-28

1978-10-17

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, H04N 946, H04N 950

Patent

active

041212436

ABSTRACT:
A color signal processing apparatus, particularly a circuit for generating a color sub-carrier wave for demodulation, used in a color television receiver set to demodulate a carrier color signal to reproduce a color image, is disclosed. The apparatus comprises an oscillation circuit including four differential amplifiers to synthesize oscillation signals having phases which differ 90.degree. from each other to produce a color subcarrier wave, a color-phase adjusting circuit for changing phases of the oscillation signals from the oscillation circuit by changing bias voltages of the differential amplifiers, and a phase detection circuit for comparing the phases of the oscillation signals having the phases changed by the color phase adjusting circuit with a phase of a color burst signal to change the bias voltages of the differential amplifiers in the oscillation circuit depending on the comparison.

REFERENCES:
patent: 3585285 (1971-06-01), Rennick
patent: 4006423 (1977-02-01), Kuniyoshi et al.
patent: 4020500 (1977-04-01), Harwood

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