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Type: Journal article
Title: A comparison of filter design structures for multi-channel acoustic communication systems
Author: Dumuid, P.
Cazzolato, B.
Zander, A.
Citation: Journal of the Acoustical Society of America, 2008; 123(1):174-185
Publisher: Acoustical Soc Amer Amer Inst Physics
Issue Date: 2008
ISSN: 0001-4966
Statement of
Pierre M. Dumuid, Ben S. Cazzolato, and Anthony C. Zander
Abstract: The application of inverse filter designs as a means of providing improved communication performance in acoustic environments is investigated. Tikhonov regularized inverse filters of channel transfer functions calculated in the frequency domain are used as a means of obtaining multi-channel filters. Three classifications of inverse filter structures have been considered using time-domain simulations. The performance of Tikhonov regularized inverse filters designed according to each of these classifications is compared with each other and against a filter design developed by Stojanovic [Stojanovic, M. (2005). "Retrofocusing techniques for high rate acoustic communications," J. Acoust. Soc. Am. 117, 1173-1185]. It is shown that the filter design developed by Stojanovic requires less regularization and outperforms the Tikhonov regularized inverse filter designs when communicating over a single channel. While the filter developed by Stojanovic is designed to use multiple transmitters to transmit to a single receiver, the filter was implemented in a multi-channel system and proposed to have a focusing similar to that obtained using time-reversal. It was found that for the scenario used in the simulation, the Tikhonov regularized inverse design for full multi-channel inversion achieved better focusing than the design by Stojanovic, where simulation results show 20 dB less cross-talk at the expense of around 2 dB loss in signal strength.
Keywords: acoustic filters; acoustic signal processing
RMID: 0020080059
DOI: 10.1121/1.2804940
Appears in Collections:Mechanical Engineering publications
Environment Institute publications

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