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Spherical harmonic analysis of equalization in a reverberant room

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2 Author(s)
T. Betlehem ; Dept. of Telecommun. Eng., Australian Nat. Univ., Canberra, ACT, Australia ; T. D. Abhayapala

We investigate the performance of acoustic equalization in reverberant environments. We first highlight an efficient general representation of a sound field using spherical harmonics. We then use this representation to develop a concise closed-form expression for robustness of equalization to sensor movement. This expression is used (i) to characterize equalization performance for a general class of non-isotropic sound fields and (ii) to quantify the improvements to equalizer robustness that can be obtained by using a directional microphone. This approach does not use any of the assumptions of statistical acoustics, but instead exploits the inherent properties of a sound field as described by the wave equation.

Published in:

Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on  (Volume:1 )

Date of Conference:

17-21 May 2004