Color subcarrier generator

Details Color subcarrier generator Color subcarrier generator

H - Electricity

04

N

350/68

H04N 9/455 (2006.01) H03B 27/00 (2006.01) H03L 7/08 (2006.01)

Patent

CA 1074908

ABSTRACT OF THE DISCLOSURE A color signal processing apparatus, particu- larly 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 degrees 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 ampli- fiers, 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 oscil- lation circuit depending on the comparison.

276174

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