移動マイクロホンを用いた指向性スペクトル分析システム

概要

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This paper describes a new system of estimating spectrum of incident sound from a specified direction. The system is composed of two microphones, one of which is fixed and the other moves along straight line from the fixed one to the specified direction. A uni-beam directivity is achieved when the outputs of the microphones are delayed so that both outputs are in phase for the incident sound from the direction to which the microphone moves. After giving the adequate delay time, the power spectrum and the cross spectrum are computed, and the power spectrum of the incident sound from the specified direction is estimated. The directivity can be made sharper with increasing the length of the span of the moving microphone. This system is applicable to the case of many sound sources. The validity of this system is proved not only by the digital simulation but also by the experiment conducted in an anechoic chamber
社団法人日本音響学会の論文
1979-06-01