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Plane Wave Decomposition and Beamforming for Directional Spatial Sound Localization

Title
Plane Wave Decomposition and Beamforming for Directional Spatial Sound Localization
Author
전진용
Keywords
Beamforming; Directional impulse responses; Plane wave decomposition; Spatio-temporal analysis
Issue Date
2016-01
Publisher
Institute of Electrical and Electronics Engineers
Citation
Proceedings of 2016 13th International Bhurban Conference on Applied Sciences and Technology, IBCAST 2016, Article number 7429929, Page. 528-534
Abstract
Sound field decomposition using spherical microphone arrays has become a focus of interest for spatio-temporal analysis of the sound field in room acoustics, spatial audio rendering applications, and an estimation of the direction and localization of acoustic sources. The existing methods to localize acoustics sources and describe the sound field normally depend on omnidirectional sound field capturing by utilizing a few pairs of microphones and employing traditional correlation techniques. Therefore, these methods yield an approximate estimation of an overall acoustic analysis and parameters estimation of the captured sound field. In this paper, we performed sound field decomposition and beamforming to analyze the spatio-temporal structures of the captured impulse responses (IRs) using a 32-channel spherical microphone array in an anechoic chamber hall and in a real auditorium. We propose an approach based on a combination of plane wave decomposition (PWD), using spherical harmonics (SH) analysis, and an adaptive beamforming technique, as weighting filters for the PWD. Among adaptive beamforming techniques minimum variance distortionless response (MVDR) is investigated and used to compute the directional behavior of sound fields in the form of directional impulse responses (DIRs), in order to explain the influence of surrounding space on the propagation of the direct sound and several reflections. Furthermore, simultaneous localization of multiple sources and the variation in their temporal behavior is investigated and presented. The comparison between the results of computed directions of incidence of sound and the directions known beforehand showed a good agreement with each other inferring an effective application of spherical microphone arrays to sound field analysis.
URI
http://ieeexplore.ieee.org/document/7429929/http://hdl.handle.net/20.500.11754/30555
ISBN
978-1-4673-9127-6
ISSN
2151-1411
DOI
10.1109/IBCAST.2016.7429929
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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