Wavelet packet based analysis of sound fields in rooms using coincident microphone arrays

Date

2007-07-01

Author

Günel Kılıç, Banu
Hacıhabiboğlu, Hüseyin

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This paper presents a passive analysis method for determining the spatio-temporal characteristics of sound fields in small rooms. The analysis finds an approximate directional reflectogram (ADR) which reveals the approximate arrival directions, time delays and amplitudes of the direct sound and early reflections without using a special or known sound source. A coincident microphone array is used to obtain directional recordings. The recordings are analysed by wavelet packet decomposition to determine the direction of the sound source and select wavelet packet coefficients to reconstruct the estimate of the direct sound. ADR is then computed via deconvolution using this estimate. Experiments have been carried out using synthesized recordings that were obtained from actual room impulse responses measured in two rooms for various source locations. The method estimates the source direction with a mean absolute error of about 7 degrees. Calculated ADRs provide a good estimate of the time delays and arrival directions of acoustical reflections, whereas the amplitudes differ slightly.

Subject Keywords

Sound field, Microphone array, Source localization, Directional impulse response, Wavelet

URI

https://hdl.handle.net/11511/30990

Journal

APPLIED ACOUSTICS

DOI

https://doi.org/10.1016/j.apacoust.2006.04.008

Collections

Graduate School of Informatics, Article

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Citation Formats

B. Günel Kılıç and H. Hacıhabiboğlu, “Wavelet packet based analysis of sound fields in rooms using coincident microphone arrays,” APPLIED ACOUSTICS, pp. 778–796, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30990.