Investigation on Optimal Microphone Arrangement of Spherical Microphone Array to Achieve Shape Beamforming
Tomoki Taguchi, Takahiro Nakadai, Ryohei Egusa, Miki Namatame, Fusako Kusunoki, Masanori Sugimoto, Etsuji Yamaguchi, Shigenori Inagaki, Yoshiaki Takeda, Hiroshi Mizoguchi · 2014
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.