The operational principle of a boundary-layer microphone is well-known. To one aspect, there is not paid enough attention: A plane wavefront reaching the boundary-layer microphone will be diffracted by the microphone plate and cause a secondary sound field. Therefore, irregularities in frequency response and polar pattern arise. A theoretical model is presented which described these irregularities. Both, experimental and theoretical data are shown to verify the theoretical assumptions. A shape of a microphone plate is found which delivers a boundary-layer microphone providing regular polar pattern and frequency response in the entire pick-up area.
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