Robustness analysis of room equalization for soundfield reproduction within a region

Dumidu S. Talagala; Wen Zhang; Thushara D. Abhayapala

doi:10.1121/1.4800256

Robustness analysis of room equalization for soundfield reproduction within a region

Dumidu S. Talagala^*, Wen Zhang, Thushara D. Abhayapala

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

Abstract

Recent works on soundfield reproduction have presented several methods of recreating a desired soundfield within a region. Estimation or prior knowledge of the inverse reverberant channels now becomes an essential element of equalizing the room effects. However, it has been shown that designing point-to-point equalizers by sampling the reverberant soundfield is only practical within a few tenths of a wavelength of the sampled locations. This work investigates the robustness of the equalization process applied to a region, with respect to changing of actual microphone positions from their expected locations. We use a modal description of the equalized soundfield to obtain theoretical results for region equalization error due to positioning errors. Simulation results suggest that equalizing the reverberant soundfield recorded at multiple positions around the edge of the reproduction region is more immune to the positioning errors.

Original language	English
Article number	015023
Journal	Proceedings of Meetings on Acoustics
Volume	19
DOIs	https://doi.org/10.1121/1.4800256
Publication status	Published - 2013
Event	21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada Duration: 2 Jun 2013 → 7 Jun 2013

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title = "Robustness analysis of room equalization for soundfield reproduction within a region",

abstract = "Recent works on soundfield reproduction have presented several methods of recreating a desired soundfield within a region. Estimation or prior knowledge of the inverse reverberant channels now becomes an essential element of equalizing the room effects. However, it has been shown that designing point-to-point equalizers by sampling the reverberant soundfield is only practical within a few tenths of a wavelength of the sampled locations. This work investigates the robustness of the equalization process applied to a region, with respect to changing of actual microphone positions from their expected locations. We use a modal description of the equalized soundfield to obtain theoretical results for region equalization error due to positioning errors. Simulation results suggest that equalizing the reverberant soundfield recorded at multiple positions around the edge of the reproduction region is more immune to the positioning errors.",

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AB - Recent works on soundfield reproduction have presented several methods of recreating a desired soundfield within a region. Estimation or prior knowledge of the inverse reverberant channels now becomes an essential element of equalizing the room effects. However, it has been shown that designing point-to-point equalizers by sampling the reverberant soundfield is only practical within a few tenths of a wavelength of the sampled locations. This work investigates the robustness of the equalization process applied to a region, with respect to changing of actual microphone positions from their expected locations. We use a modal description of the equalized soundfield to obtain theoretical results for region equalization error due to positioning errors. Simulation results suggest that equalizing the reverberant soundfield recorded at multiple positions around the edge of the reproduction region is more immune to the positioning errors.

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Robustness analysis of room equalization for soundfield reproduction within a region

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