Circuitry for suppressing audible noise

Details Circuitry for suppressing audible noise Circuitry for suppressing audible noise

1988-08-24

1989-09-05

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

307353, 307540, 307542, 307125, 330 51, 330 86, 330254, 360 60, 360 61, H03G 326

Patent

active

048641553

ABSTRACT:
An arrangement for suppressing audible noise occurring when audio equipment is switched on and off, in which a first electronic switch is connected to the output of an amplifier that has a negative feedback loop formed between the amplifier output and an inverting input of the amplifier. The output of the amplifier is connected to a load impedance through the first electronic switch. A second electronic switch is connected to a junction between the load impedance and the first electronic switch, and to the inverting input of the amplifier. A joint control line permits the two electronic switches to be turned on and off simultaneously. The two electronic switches can be connected in parallel through a feedback resistor in the negative feedback loop.

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