DocumentCode :
3428325
Title :
Generalized framework for spherical microphone arrays: Spatial and frequency decomposition
Author :
Abhayapala, Thushara D.
Author_Institution :
Dept. of Inf. Eng., Australian Nat. Univ., Acton, ACT
fYear :
2008
fDate :
March 31 2008-April 4 2008
Firstpage :
5268
Lastpage :
5271
Abstract :
This paper provides a generalized framework to decompose a sourcefield into its spatial and frequency components using a spherical microphone array. Spherical arrays are used to decompose a soundfield into spherical harmonics which are the natural basis functions for space over directions. This paper extends this theory by including basis functions in frequency to decompose a soundfield into spatial-frequency components. Specifically, we use spherical Bessel functions as a set of basis in frequency. The paper also shows how to avoid numerical ill-conditioning inherited in open spherical arrays at frequencies corresponding to Bessel zeros.
Keywords :
Bessel functions; microphone arrays; basis functions; frequency decomposition; numerical ill-conditioning; sourcefield decomposition; spatial decomposition; spatial-frequency components; spherical Bessel functions; spherical arrays; spherical harmonics; spherical microphone arrays; Acoustic propagation; Acoustical engineering; Array signal processing; Filtering; Frequency dependence; Joining processes; Microphone arrays; Power harmonic filters; Speech enhancement; Surveillance; Fourier spherical Bessel series; Spherical microphone array; beamforming; sound field; spatial decomposition;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Conference_Location :
Las Vegas, NV
ISSN :
1520-6149
Print_ISBN :
978-1-4244-1483-3
Electronic_ISBN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2008.4518848
Filename :
4518848
Link To Document :
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