Vertical sync separator

Details Vertical sync separator Vertical sync separator

1991-05-17

1993-07-20

Oberley, Alvin E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358155, H04N 510

Patent

active

052298540

ABSTRACT:
In a vertical sync separator, a composite sync signal in which picture information is removed is coupled via a low-pass filter to an input terminal of a comparator having a predetermined threshold level. The comparator produces an output signal when a voltage at the input terminal is more positive than the threshold level, that is indicative of the occurrence of a vertical sync pulse. When any of equalizing and horizontal sync pulses occurs, the comparator output signal is not produced. A negative current source is coupled to the low-pass filter to provide level shifting of the comparator input voltage so as to increase a guard band or noise immunity of the sync separator.

REFERENCES:
patent: 5031041 (1991-07-01), Fling
Gibson & Schroeder; "Noise Immune Vertical Sync Separator"; Nov. 1959.
Data information for integrated circuit RCA CA3218E, dated 1985.
Report CER-105 entitled Television Sync Separator Design, prepared by M. Giles, and published by Motorola Co.

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