Chrominance signal processing system

Details Chrominance signal processing system Chrominance signal processing system

1985-06-04

1987-06-02

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, H04N 964

Patent

active

046707760

ABSTRACT:
A chrominance signal processing system includes an A/D converter for converting an analog video signal including a carrier chrominance signal into a digital signal and a frequency controlable variable frequency oscillator for generating a clock to be fed to the A/D converter and a phase comparator for comparing the phase of the output of the A/D converter with the phase of the clock and a computing circuit for computing the absolute value and sign of the output signal of the phase comparator during a burst period. The system further includes two current sources of a current outflow type and a current influx type, having current values which are controlled by the absolute value output of the computing circuit and are turned on/off respectively by the sign output of the computing circuit, the output terminals of the two current sources being connected to each other and the outputs of the current sources controlling the variable frequency oscillator through a low pass filter.

REFERENCES:
patent: 4291332 (1981-09-01), Kato
patent: 4376268 (1983-03-01), Moriya
patent: 4458356 (1984-07-01), Toy
patent: 4523150 (1985-06-01), Hogeboom
patent: 4523223 (1985-06-01), Luder
patent: 4527145 (1985-07-01), Haussmann

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