Muting circuit

Details Muting circuit Muting circuit

1975-04-23

1976-11-16

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 51, 330149, H03F 126

Patent

active

039926770

ABSTRACT:
A muting circuit which includes an amplifier having input and output terminals and a bi-directional transistor connectd between the output terminal and a circuit point of low reference potential. The transistor has emitter base and collector regions, the emitter region having a low impurity concentration substantially the same as that of the collector region and a potential barrier being provided opposite to the junction of the emitter and base regions at a distance which is smaller than the diffusion length of minority carriers of the base region. A control signal generating means including time constant means for turning on the bi-directional transistor is provided. The time constant means assures that the bi-directional transistor will be on for only a brief interval of time to bypass the output signal of the amplifier to the low reference potential circuit point and thereby avoid the presence of a pop noise at the speaker.

REFERENCES:
patent: 3544720 (1970-12-01), Corderman
patent: 3889202 (1975-06-01), Suzuki

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