Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-01-26
1983-09-20
Murray, Richard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
179 1A, 455218, 455222, H04N 560
Patent
active
044059485
ABSTRACT:
An arrangement for suppressing the audible effects of operating supply voltage transients developed when a sound reproducing system including a gain controlled audio amplifier is initially energized and de-energized. A control path supplies the amplifier with a gain (volume) control voltage of positive and negative senses corresponding to maximum and minimum sound volume. A first capacitor is coupled between the control path and a source of positive operating voltage from which the gain control voltage is derived. A normally non-conductive threshold conduction device and a second capacitor are coupled in series with the first capacitor between the control path and ground. The threshold device is biased to be rendered conductive for coupling positive-going supply voltage transients away from the control path via the second capacitor when the system is initially energized, thereby suppressing the audible effects of the positive transients. Negative-going supply transients developed on the control path when the system is de-energized are in a direction corresponding to minimum volume and are essentially inaudible.
REFERENCES:
patent: 2850564 (1958-09-01), Levine
patent: 3327132 (1967-06-01), Cones et al.
patent: 3805090 (1974-04-01), Kaiser
patent: 3916321 (1975-10-01), Morse
patent: 3965295 (1976-06-01), Evans et al.
patent: 4127743 (1978-11-01), Ozawa et al.
patent: 4153879 (1979-05-01), Sakaida
patent: 4204170 (1980-05-01), Kage
Circuit Portions of Philips Corporation Color Television Receiver K-12.
Circuit Diagram for "Television Sound Combination" TDA=2790 Published by Philips Corporation, Apr. 1977.
Circuit Portions of Korting Electronic GmbH Color Television Receiver Chassis 9.
Edelman L. C.
Murray Richard
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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