Synchronous signal separation circuit

Details Synchronous signal separation circuit Synchronous signal separation circuit

1989-09-01

1991-09-03

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

307350, H04N 508

Patent

active

050459430

ABSTRACT:
A circuit for separating a synchronous signal from a video signal including a comparator and a bias circuit. The comparator is adapted to receive a video signal which also includes a synchronous signal. The comparator generates a pulse signal whose voltage increases when the voltage of the video signal exceeds a reference value and decreases when the voltage of the video signal is below the reference level. The bias circuit is responsive to an increase in the voltage of the synchronous signal for shifting the voltage of the video signal input into the comparator by a predetermined value which is smaller than the amount by which the voltage of the synchronous signal increases, in the same direction in which the video signal increases above the reference level.

REFERENCES:
patent: 4254435 (1981-03-01), Dayton et al.
patent: 4491743 (1985-01-01), Smith
patent: 4635115 (1987-01-01), Kamiya

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