Circuit for forming a vertical synchronizing signal

Details Circuit for forming a vertical synchronizing signal Circuit for forming a vertical synchronizing signal

1979-01-23

1981-03-24

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328111, 329106, H04N 508

Patent

active

042583896

ABSTRACT:
A circuit for forming a vertical synchronizing pulse at the end of a field of a composite video signal utilizes the characteristic of the video signal that the equalizing pulses in the vertical blanking interval have a pulse width one-half that of the horizontal synchronizing pulses in the composite video signal. Accordingly, the circuit includes a discriminating pulse generator which generates a discriminating pulse whose duration ends before the trailing edge of a horizontal synchronizing pulse, but after the trailing edge of an equalizing pulse; a comparator, such as a D-type flip-flop, for comparing the timing of the discriminating pulses with that of the equalizing and horizontal synchronizing pulses to discriminate the equalizing pulses on the basis of such comparison; and a generator for generating the vertical synchronizing pulse in response to the discrimination of the equalizing pulses.

REFERENCES:
patent: 3588718 (1971-06-01), Oiso
patent: 3801828 (1974-04-01), Lynn et al.
patent: 3886463 (1975-05-01), Caprio
patent: 3925613 (1975-12-01), Kokado
patent: 3979605 (1976-09-01), Fukaya

Affiliated with

Also associated with

Rating

Circuit for forming a vertical synchronizing signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for forming a vertical synchronizing signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for forming a vertical synchronizing signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2410228