Mute circuit for audio amplifiers

Details Mute circuit for audio amplifiers Mute circuit for audio amplifiers

1991-07-22

1992-11-24

Dwyer, James L.

Electrical audio signal processing systems and devices

Including amplitude or volume control

381107, 455224, 307355, H03G 300, H04B 100, H03K 522

Patent

active

051669838

ABSTRACT:
A mute circuit for an audio amplifier has been provided. The mute circuit alternately switches from a normal mode of operation to a mute mode of operation. In the normal mode of operation, the mute circuit utilizes a first op amp circuit to amplify an input signal by a predetermined factor. In the mute mode of operation, the mute circuit utilizes a second op amp circuit which is configured as an unity gain amplifier. In the mute mode, DC shifts occurring at the output of the second op amp circuit are minimized. Further, the second op amp circuit has a low output impedance thereby providing excellent attenuation of an audio input signal when the mute circuit is utilized in an audio amplifier application.

REFERENCES:
patent: 3986051 (1976-10-01), Okada et al.
patent: 4099127 (1978-07-01), Juniper
patent: 4176286 (1979-11-01), Shuffield, Jr.
patent: 4288753 (1981-09-01), Babano
patent: 4410858 (1983-10-01), Kusakabe
patent: 4496849 (1985-01-01), Kotowaski
patent: 4760286 (1988-07-01), Pigott
patent: 4948991 (1990-08-01), Schucker et al.
patent: 4977609 (1990-12-01), McClure
patent: 4991227 (1991-02-01), Kehler, Jr.

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