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SPHERICAL HARMONIC ANALYSIS OF EQUALIZATION IN A REVERBERANT ROOM Terence Betlehem and Thushara D. Abhayapala
 

Summary: SPHERICAL HARMONIC ANALYSIS OF EQUALIZATION IN A REVERBERANT ROOM
Terence Betlehem and Thushara D. Abhayapala
National ICT Australia, Department of Telecommunications Engineering
RSISE, Australian National University
Canberra, ACT, 0200, Australia
Email: [Terence.Betlehem, Thushara.Abhayapala]@anu.edu.au
ABSTRACT
In this paper, we investigate the performance of acoustic
equalization in reverberant environments. We first high-
light an efficient general representation of a sound field us-
ing 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. The approach used here
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.

  

Source: Abhayapala, Thushara D. - Department of Information Engineering, Australian National University

 

Collections: Computer Technologies and Information Sciences