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Hemispherical microphone arrays for sound capture and beamforming

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2 Author(s)
Zhiyun Li ; Perceptual Interfaces & Reality Lab., Maryland Univ., College Park, MD, USA ; R. Ruraiswami

We design and demonstrate a hemispherical microphone array for spatial sound acquisition and beamforming. Our design makes use of the acoustic image principle. It is especially appropriate for a half 3D acoustic environment where all sound sources are constrained on one side of a rigid plane. It avoids the difficulties of building a full spherical microphone array yet keeps the advantage of achieving a direction-invariant beampattern. A special microphone layout is designed for simple implementation. We also propose an approach to effectively calibrate data-independent coefficients of the system. Simulation and experimental results are presented

Published in:

IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2005.

Date of Conference:

16-16 Oct. 2005