Monostable trigger circuit usable with horizontal sync pulses of

Details Monostable trigger circuit usable with horizontal sync pulses of Monostable trigger circuit usable with horizontal sync pulses of

1987-09-30

1991-05-21

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358158, 307273, 328207, H04N 504

Patent

active

050180118

ABSTRACT:
A monostable, that is triggered by either positive or negative polarity horizontal sync pulses, supplies the horizontal deflection system of a monitor. A first transistor of the monostable has its emitter and its base connected through oppositely poled diodes to the horizontal sync input terminal of the monitor. Incoming horizontal sync pulses of either polarity trigger a respective one of the diodes to drive the first transistor into conduction. The time constant of the first transistor is selected to be slightly greater than the duration of the input sync pulses to preclude the monostable triggering on the trailing edge of a sync pulse.

REFERENCES:
patent: 3099712 (1963-07-01), Meacham
patent: 3846647 (1974-11-01), Tanimoto
patent: 4263615 (1981-04-01), Steinmetz et al.
patent: 4453183 (1984-06-01), Balaban et al.

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