Horizontal sync detector

Details Horizontal sync detector Horizontal sync detector

1983-07-28

1985-10-29

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 508

Patent

active

045503427

ABSTRACT:
An improved circuit for detection of horizontal sync pulses for use in high esolution digital processing of video data when low line-to-line registration uncertainty is required. The detector comprises three main parts, a negative peak detector, a proportioning amplifier and a high speed comparator for level detection. The peak detector allows a reference point to be established over a wide signal and temperature range with little error due to inherent accuracy and stability of the operational amplifier circuitry, and has an ability to adjust the triggering point of a comparator dependent upon video signal level.

REFERENCES:
patent: 3706847 (1972-12-01), Smeulers
patent: 3718864 (1973-02-01), Kelly et al.
patent: 3869624 (1975-03-01), Fletcher et al.
patent: 4468625 (1984-08-01), Tandart et al.

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