Coherent signals direction-of-arrival estimation using a spherical microphone array: Frequency smoothing approach

Direction-of-arrival (DOA) estimation of coherent signals is considered of great importance in signal processing. To estimate both azimuth and elevation angle with the same accuracy, 3-dimensional (3-D) array must be used. Spherical arrays have the advantage of spherical symmetry, facilitating 3-D D...

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Bibliographic Details
Published in2009 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics pp. 221 - 224
Main Authors Khaykin, D., Rafaely, B.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2009
Subjects
Array signal processing
Azimuth
Direction of arrival estimation
Frequency estimation
Microphone arrays
multipath
Multiple signal classification
Signal processing
Signal processing algorithms
Signal resolution
Smoothing methods
spherical microphone array
wideband sources
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ISBN1424436788
9781424436781
ISSN1931-1168
DOI10.1109/ASPAA.2009.5346492

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Summary:Direction-of-arrival (DOA) estimation of coherent signals is considered of great importance in signal processing. To estimate both azimuth and elevation angle with the same accuracy, 3-dimensional (3-D) array must be used. Spherical arrays have the advantage of spherical symmetry, facilitating 3-D DOA estimation. To apply high resolution subspace DOA estimation algorithms, such as MUSIC, in a coherent environment, a smoothing technique is required. This paper presents the development of a smoothing technique in the frequency domain for spherical microphone arrays. We show that frequency smoothing can be efficiently performed using spherical arrays due to the decoupling of frequency and angular components. Experimental comparison of DOA estimation between beamforming and MUSIC with frequency smoothing is performed with data measured in a real auditorium.
ISBN:1424436788
9781424436781
ISSN:1931-1168
DOI:10.1109/ASPAA.2009.5346492