Investigation on Optimal Microphone Arrangement of Spherical Microphone Array to Achieve Shape Beamforming

This paper presents a spherical microphone array design which can be used for capturing a sound selectivity and locally. Capturing a sound by microphone array is achieved by method of Delay and Sum Beam Forming (DSBF). In this method, microphone arrangement has a large effect on the directivity. Using beam forming simulation, the authors investigated on the optimal arrangement of concentrically spherical microphone array which improves the basic performance of beam forming. As a result, we obtained a high directional quality arrangement consisted of truncated icosahedron and regular icosahedron. By comparing the uniformity scattered method, we confirmed the effectiveness of proposed method.