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Theory and Design of Soundfield Reproduction using Continuous Loudspeaker Concept
 

Summary: 1
Theory and Design of Soundfield Reproduction
using Continuous Loudspeaker Concept
Yan Jennifer WU & Thushara D. Abhayapala
Department of Information Engineering
Research School of Information Sciences & Engineering
Australian National University
Email:jennifer.wu@rsise.anu.edu.au, thushara.abhayapala@anu.edu.au
Phone: 61-2-61258822 Fax: 61-2-61258860
Abstract
Reproduction of a soundfield is a fundamental problem in acoustic signal processing. A common
approach is to use an array of loudspeakers to reproduce the desired field where the least squares
method is used to calculate the loudspeaker weights. However, the least squares method involves matrix
inversion which may lead to errors if the matrix is poorly conditioned. In this paper, we use the
concept of theoretical continuous loudspeaker on a circle to derive the discrete loudspeaker aperture
functions by avoiding matrix inversion. In addition, the aperture function obtained through continuous
loudspeaker method reveals the underlying structure of the solution as a function of the desired soundfield,
the loudspeaker positions, and the frequency. This concept can also be applied for the 3D soundfield
reproduction using spherical harmonics analysis with a spherical array. Results are verified through
computer simulations.

  

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

 

Collections: Computer Technologies and Information Sciences