| 摘要 |
PROBLEM TO BE SOLVED: To reduce distortion of an output signal and increase dynamic range in a two-wire-type capacitor microphone with a simple circuit configuration.SOLUTION: A capacitor microphone 10 includes: a capacitor microphone unit 1 having a diaphragm and a fixed pole disposed so as to face the diaphragm; an FET 21 as an impedance converter 2; and a transistor 31 generating an operating power source for the FET. The fixed pole or the diaphragm is connected to a gate of the FET, and the diaphragm facing the fixed pole connected to the gate or the fixed pole facing the diaphragm connected to the gate is grounded. A base of the transistor is connected to a source of the FET, and an emitter of the transistor is connected to a drain of the FET. A resistor 32 setting a base potential of the transistor is disposed between the base of the transistor and the ground. |
