32-Channel Omni-Directional Microphone Array Design and Implementation
Yoko Sasaki*, Tomoaki Fujihara**, Satoshi Kagami*,
Hiroshi Mizoguchi**, and Kyoichi Oro***
*Digital Human Research Center, National Institute of Advanced Science and Technology (AIST), 2-3-26 Aomi, Kouto-ku, Tokyo 135-0064, Japan
**Dept. of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
***The Kansai Electric Power Co. Inc., 3-11-20 Nakoji, Amagasaki, Hyogo 661-0974, Japan
This paper presents the design and evaluation of a microphone array. The proposed evaluation index is the directional characteristic of delay and sum beamforming, which is used to optimize the microphone array design. Using beamforming simulation, a microphone arrangement that minimizes sidelobes and improves the basic performance of beamforming is selected. The new hardware has omni-directional directivity and high tolerance for exogenous noise. It has 32 microphones on a 335-mm diameter disk designed to be mounted on a mobile robot. The microphone array performance is verified in different real environments. Experimental results in indoor/outdoor sound localization show the effectiveness of the array in reverberant environments and its robustness against different pressure sound sources for covering larger areas.
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