Automatic frequency pulling circuit

Details Automatic frequency pulling circuit Automatic frequency pulling circuit

1986-07-29

1987-11-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358158, H04N 506

Patent

active

047092688

ABSTRACT:
An automatic frequency pulling circuit produces a signal in synchronism with a horizontal synchronizing signal from a video signal processing device or the like. The automatic frequency pulling circuit comprises an equalizing pulse remover responsive to a synchronizing signal separated from a composite video signal for alternately removing equalizing pulses therefrom, and a PLL circuit composed of at least a phase comparator and a voltage-controlled oscillator. The phase comparator is arranged to compare the phases of an output from the equalizing pulse remover and an output from the voltage-controlled oscillator, for thereby producing the signal in synchronism with the horizontal synchronizing signal. The signal thus generated is utilized in a video monitor, for example, to display accurate images thereon.

REFERENCES:
patent: 4520394 (1985-05-01), Kaneko

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