Automatic control circuit for vertical synchronizing signal

Details Automatic control circuit for vertical synchronizing signal Automatic control circuit for vertical synchronizing signal

1990-07-11

1991-11-12

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

315370, H04N 504

Patent

active

050652397

ABSTRACT:
An automatic control circuit for a vertical synchronizing signal comprising an input stage for converting a vertical synchronizing signal applied from the external to a low level signal, a proportion-oscillator for providing a triggered signal, a discriminator for discriminating the input of the vertical synchronizing signal, an oscillation-stop controller for driving in relation to the input discriminator, a vertical synchronizing signal oscillator for oscillating in relation to the oscillation-stop controller and a ramp generator for normalizing an output waveform of the vertical synchronizing signal controller, wherein the vertical synchronizing signal of which frequency is the same with that of the external vertical synchronizing signal can be generated by using the pulse of the external vertical synchronizing signal as a trigger and be independent of a frequency range and a surrounding temperature.

REFERENCES:
patent: 4621240 (1986-11-01), Alvord et al.
patent: 4709267 (1987-11-01), Sendelweck
patent: 4803552 (1989-02-01), Marin

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