A method of speech recording in a noisy environment caused by vibration of panel

概要

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This paper summarizres the study of active cancellation of noise due to vibration of a panel at the output terminal of microphone. The vibration of panel, which radiates noise, is picked up by an acceleration pick-up. The noise output of the microphone due to vibration is estimated by computing the convolution between the output of acceleration pick-up and the transfer function from the pick-up to the microphone output. By subtracting the estimated noise output due to vibration, the noise in the microphone output is suppressed, and the necessary acoustic signal is left. The effectiveness and the limit of this method are experimentally shown. And the existence of zero point in the transfer function from the driving point top vibration pick up point due to vibration of panel is pointed out as the reason why the noise can not be completely suppressed when the vibration pick up point is far from the driving point.
社団法人日本音響学会の論文