Synchronous separation circuit

Details Synchronous separation circuit Synchronous separation circuit

1989-01-23

1991-03-12

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358154, H04N 508, H04N 510

Patent

active

049997084

ABSTRACT:
A synchronous separation circuit used in a television video circuit for generating a horizontal synchronizing signal and a vertical synchronizing signal from a composite synchronizing signal has: a unit for generating a clock signal used as a reference signal and having a frequency higher than the frequency of the horizontal synchronizing signal; a unit for counting the clock signal from a front edge of a pulse contained in the composite synchronizing signal; a unit for obtaining a horizontal synchronous separation and for determining a counting term and outputting the horizontal synchronizing signal after the counting unit counts from the front edge of the horizontal synchronizing signal to a predetermined number; and a unit for obtaining a vertical synchronous separation and for latching the composite synchronizing signal based on an output of the counting unit, separate the vertical synchronizing signal from the composite synchronizing signal.

REFERENCES:
patent: 4491870 (1985-01-01), Aschwanden
patent: 4675734 (1987-06-01), Widom
patent: 4701796 (1987-10-01), Kamiya
patent: 4769704 (1988-09-01), Hirai et al.
patent: 4792852 (1988-12-01), Narusawa

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