Microphone circuit
AssigneeKabushiki Kaisha Audio-Technica
InventorHiroshi Akino
Life of this patent
Estimating the term…
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.
Claims8
A microphone circuit, comprising:
- an electroacoustic transducing module for receiving a sound wave to convert it into an electric signal;
- an amplifier for amplifying the electric signal output from the 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 the 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, wherein
- 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 a microphone output when the light source is turned off.
Dependencies are inferred from the claim text.