Microphone circuit

Details Microphone circuit Microphone circuit

2011-08-30

2011-08-30

Faulk, Devona E (Department: 2614)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S122000, C381S123000, C381S375000

Reexamination Certificate

active

08009843

ABSTRACT:
A microphone circuit includes an amplifier for amplifying an electric signal output from an electroacoustic transducing module, an external power supply circuit capable of supplying power for driving at least the amplifier from the outside, a light source that is turned on when an external power is supplied through the external power supply circuit, and a photo relay having contacts that are turned on and off in response to blinking of the light source. The contacts of the photo relay are connected so as to output an output signal of the amplifier as a microphone output when the light source is turned on and output an output signal of the electroacoustic transducing module as the microphone output when the light source is turned off.

REFERENCES:
patent: 4567608 (1986-01-01), Watson et al.
patent: 2002/0186855 (2002-12-01), Akino et al.
patent: 2005/0232442 (2005-10-01), Seknicka
patent: 2003-116193 (2003-04-01), None

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