Differential microphone with dual polarity bias
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United States of America Patent
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Sep 1, 2015
Grant Date -
Sep 18, 2014
app pub date -
Sep 26, 2013
filing date -
Mar 14, 2013
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Abstract
Methods and system are described for cancelling interference in a microphone system. A positive bias voltage is applied to a first microphone diaphragm and a negative bias voltage is applied to a second microphone diaphragm. The diaphragms are configured to exhibit substantially the same mechanical deflection in response to acoustic pressures received by the microphone system. A differential output signal is produced by combining a positively-biased output signal from the first microphone diaphragm and a negatively-biased output signal from the second microphone diaphragm. This combining cancels common-mode interferences that are exhibited in both the positively-biased output signal and the negatively-biased output signal.
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