Horizontal synchronizing signal generating circuit

Details Horizontal synchronizing signal generating circuit Horizontal synchronizing signal generating circuit

1991-08-08

1993-05-04

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 506

Patent

active

052086720

ABSTRACT:
A horizontal synchronizing reference signal producing circuit produces an internal horizontal synchronizing reference based upon an inputted clock and a reset pulse, a phase comparator compares the phases of a given external horizontal synchronizing reference and an internal horizontal synchronizing reference outputted by the horizontal synchronizing reference and generates a voltage signal conforming to a difference between the two compared phases. A low-pass filter then passes low-frequency components of the voltage signal outputted by the phase comparator, a VCO, whose frequency is controlled by an output voltage signal from the low-pass filter, generates a clock applied to the horizontal synchronizing reference signal producing circuit, a decision circuit determines whether the phase difference between the internal and external horizontal synchronizing reference signal lies within a range in which follow up is capable of being performed by the VCO. A reset pulse generator then generates a reset pulse synchronized to a prescribed edge of the external horizontal synchronizing reference and a reset control circuit inhibits input of the reset to the horizontal synchronizing reference signal producing circuit when the decision circuit determines that the phase difference lies within the follow-up range, and applies the reset signal to the horizontal synchronizing reference signal producing circuit when the decision circuit determines that the phase difference lies outside the follow-up range.

REFERENCES:
patent: 4676259 (1986-10-01), Moran et al.
patent: 4769704 (1988-09-01), Hirai et al.
patent: 4872055 (1989-10-01), Teuling et al.
patent: 4974081 (1990-11-01), Yokogawa

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