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Spherical Microphone Array Shape to Improve Beamforming Performance

A 360-degree steerable super-directional beamforming are proposed. We designed a new acoustic baffle for spherical microphone array to achieve both small size and high performance. The shape of baffle is a sphere with parabola-like depressions; therefore, sound-collection performance can be enhanced using reflection and diffraction. We first evaluated its beamforming performance through simulation then fabricated a 3D prototype of an acoustic baffle microphone array with the proposed baffle shape and compared its performance to that of a conventional spherical 3D acoustic baffle. This prototype exhibited better beamforming performance. We built microphone array system that includes the proposed acoustic baffle and a 360-degree camera, our system can pick up match sound to an image in a specific direction in real-time or after recording. We have received high marks from users who experienced the system demo.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=20601

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