Digital vertical sync filter

Details Digital vertical sync filter Digital vertical sync filter

1983-10-11

1987-02-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358139, 328111, 328139, H04N 510

Patent

active

046411895

ABSTRACT:
The filter first looks in the composite sync signal for a pulse enduring at least 6 microseconds. In response to such a detection, it reconfigures to look for pulses which endure at least 12 microseconds and illustratively requires two 12-microsecond pulses in 4 horizontal lines of time which comprise a window which opens after the 6 microsecond detection. This window provides good noise immunity. If these conditions are met, it emits a drive signal for a counted duration and then reconfigures to prepare for the next field.

REFERENCES:
patent: 4214270 (1980-07-01), Morito
patent: 4319275 (1982-03-01), Tanaka

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