Low frequency normal modes of an enclosed soundfield introduce unwanted frequency, spatial and temporal artefacts to reproduced electroacoustic signals. A novel control approach has been reported [1,2] based on an analytical modal decomposition, using a low frequency soundfield model in a one-dimensional environment formed from the sum of a number of second order IIR filter sections. In this paper, these techniques are applied to the low frequency resonances of a three dimensional test room. It is shown that significant reductions in modal Q and corresponding reductions in modal decay times may be achieved, leading to smaller low-frequency soundfield variance and decreasing audibility of time-domain modal artefacts.

Author: Avis, Mark R.
Affiliation: Acoustics Research Centre, School of Acoustics and Electronic Engineering, University of Salford, Salford, Greater Manchester, UK
AES Conference: 21st International Conference: Architectural Acoustics and Sound Reinforcement (June 2002)
Paper Number: 000058
Publication Date: June 1, 2002 Import into BibTeX
Subject: Architectural Acoustics & Sound Reinforcement
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=11222

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