Vertical detail enhancement on/off switch

Details Vertical detail enhancement on/off switch Vertical detail enhancement on/off switch

1981-11-13

1983-09-06

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358166, 358181, 307253, H04N 9535

Patent

active

044032463

ABSTRACT:
In a television receiver having provision for a vertical detail enhancement signal, a circuit is provided for turning off the vertical detail enhancement without causing D.C. transients. A transistor circuit is provided having a feedback path between the collector and base electrodes which includes a capacitor and a diode. A switch actuated variable impedance is connected between a source of supply potential and the junction of the capacitor and diode. The capacitor is pre-charged when the switch is open such that when the switch is closed, to turn off the vertical detail enhancement signal, the junction point does not substantially change in D.C. level while the gain of the transistor amplifier is reduced to substantially reduce the amplitude of the enhancement signal.

REFERENCES:
patent: 3546372 (1970-12-01), Dischert
patent: 3659120 (1972-04-01), Saeki
patent: 4349750 (1982-09-01), Geurts

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