发明名称 |
DIFFERENTIAL MICROPHONE WITH DUAL POLARITY BIAS |
摘要 |
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. |
申请公布号 |
EP2974365(A2) |
申请公布日期 |
2016.01.20 |
申请号 |
EP20140717594 |
申请日期 |
2014.03.13 |
申请人 |
ROBERT BOSCH GMBH |
发明人 |
MUZA, JOHN, MATTHEW;STETSON, PHILIP, SEAN |
分类号 |
H04R1/40;H03F3/45;H04R3/00;H04R19/00 |
主分类号 |
H04R1/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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