CONDENSER MICROPHONE
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United States of America Patent
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Issued Date -
Aug 27, 2015
app pub date -
Jan 8, 2015
filing date -
Feb 24, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a condenser microphone that has a function of attenuating a low frequency component and can effectively suppress distortion or thermal noise and external noise of a signal, an impedance converter converting a change in capacitance between a diaphragm and a fixed electrode of a condenser microphone unit into an audio signal is included. An output signal of the impedance converter is supplied to a low frequency inversion signal generation circuit including a low-pass filter and a phase inversion circuit. An output of the low frequency inversion signal generation circuit is added to the diaphragm and a low frequency signal of wind noise or vibration noise is subtracted from a microphone output. An audio signal in which the wind noise or the vibration noise has been decreased is extracted as an unbalanced output between an output terminal of the impedance converter and a reference potential point of a circuit.
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