The purpose of this paper is to describe a correction implementation of group delay distortion arising from a two-way loudspeaker system crossover. Having determined an IIR all-pass filter having a group delay response corresponding to that of the system crossover to be corrected, we have validated under Matlab and implemented in DSP the time reversal solution proposed by S.A. Azizi,. S.R. Powell and P. M. Chau, enabling an IIR filter to be inversed, whilst retaining stability and causality. In addition to theory and calculation validation, we have also carried out preliminary listening tests, supporting the evaluation of timber modification, sound clarity and space localisation due to the group delay distortion correction.

Authors: Adam, Veronique; Benz, Sebastien
Affiliation: Goldmund (Audio Networks SA)
AES Convention: 122 (May 2007) Paper Number: 7111
Publication Date: May 1, 2007
Subject: Signal Processing, Sound Quality Design

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