Dereverberation performance of rigid and open spherical microphone arrays: Theory & simulation

Linear microphone arrays have been extensively used for dereverberation. In this paper we look at the dereverberation performance of two types of spherical microphone array: the open array (microphones suspended in free space) and the rigid array (microphones mounted on a rigid baffle). Dereverberat...

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Bibliographic Details
Main Authors: Jarrett, D. P., Habets, E. A. P., Thomas, M. R. P., Gaubitch, N. D., Naylor, P. A.
Format: Conference Proceeding
Language:English
Subjects:
Dereverberation
microphone array
Robustness
Online Access:Request full text
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Summary:Linear microphone arrays have been extensively used for dereverberation. In this paper we look at the dereverberation performance of two types of spherical microphone array: the open array (microphones suspended in free space) and the rigid array (microphones mounted on a rigid baffle). Dereverberation is performed in the spherical harmonic domain using a technique similar to the commonly used delay-and-sum beamformer (DSB). We analyse the theoretical performance with respect to the direct-to-reverberant ratio (DRR), and we also present simulation results obtained using a simulation tool for spherical arrays. The performance of the spherical DSB is found to increase with the radius of the sphere, and to be 1-2 dB higher for the rigid array. These results serve as a baseline for evaluating the performance of future dereverberation algorithms for spherical arrays.
DOI:10.1109/HSCMA.2011.5942382