Phase-locked circuit

Details Phase-locked circuit Phase-locked circuit

1980-04-10

1981-09-22

Safourek, Benedict V.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358150, 375120, H04N 946, H04L 708

Patent

active

042913322

ABSTRACT:
Disclosed is a phase-locked circuit which includes a voltage controlled oscillator to supply a sampling clock signal to an analog-digital converter for converting a composite color television signal into a digital signal, and a control signal generator circuit to apply a control signal to the voltage controlled oscillator in response to the composite color television signal. The control signal generator circuit includes a burst separator for extracting a digital signal component corresponding to a color burst signal from a digital output signal from the analog-digital converter, a phase signal generator producing a reference phase signal, and a digital phase error detector circuit receiving the output signals from the burst separator and phase signal generator and supplying the voltage controlled oscillator with an output signal corresponding to the phase difference between both these input signals.

REFERENCES:
patent: 3821788 (1974-06-01), Kobayashi
patent: 4122488 (1978-10-01), Mikado
patent: 4145705 (1979-03-01), Yoshinaka
patent: 4214262 (1980-07-01), Mizukami

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