A miniature differential microphone is described having a low-noise floor. The sensitivity of a differential microphone suffers as the distance between the two pressure sensing locations decreases, resulting in an increase in the input sound pressure-referred noise floor. In the microphone described here, both the diaphragm thermal noise and the electronic noise are minimized by a combination of novel diaphragm design and the use of low-noise optical sensing that has been integrated into the microphone package. The differential microphone diaphragm measures 1 x 2 mm(2) and is fabricated out of polycrystalline silicon. The diaphragm design is based on the coupled directionally sensitive ears of the fly Ormia ochracea. The sound pressure input-referred noise floor of this miniature differential microphone has been measured to be less than 36 dBA.
The Journal of the Acoustical Society of America. 2009 Apr;125(4):2013-26. doi: 10.1121/1.3082118 Q22.12024
A low-noise differential microphone inspired by the ears of the parasitoid fly Ormia ochracea
受寄生蜂Ormia ochracea耳朵启发的低噪声差分麦克风 翻译改进
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DOI: 10.1121/1.3082118 PMID: 19354377
摘要 Ai翻译
Keywords：ears of ormia ochracea; parasitoid fly
关键词：低噪声差分麦克风; Ormia ochracea的耳朵; 寄生蝇
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