Sync pulse separator system

Details Sync pulse separator system Sync pulse separator system

1987-12-31

1989-03-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 328115, 328139, H04N 508

Patent

active

048129070

ABSTRACT:
A method and apparatus for separating sync pulses by charging a capacitor to the sync tip voltage level during occurrence of a sync pulse and discharging the capacitor to the back porch voltage level for an equal duration. The discharge duration is determined by decrementing an up/down counter that was incremented during the sync pulse. A comparator separates the sync pulses by comparing the composite video signal with the voltage on the capacitor.

REFERENCES:
patent: 3706847 (1972-12-01), Smeulers
patent: 4621289 (1986-11-01), Bart et al.
patent: 4697211 (1987-09-01), Balaban et al.

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