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Journal of Sensors
Volume 2014, Article ID 675726, 14 pages
Research Article

Acoustic Source Localization via Subspace Based Method Using Small Aperture MEMS Arrays

1Science and Technology on Micro-System Laboratory, Shanghai Institute of Microsystem and Information Technology, CAS, Shanghai 200050, China
2Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

Received 26 February 2014; Revised 1 June 2014; Accepted 8 June 2014; Published 16 July 2014

Academic Editor: Xinyong Dong

Copyright © 2014 Xin Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Small aperture microphone arrays provide many advantages for portable devices and hearing aid equipment. In this paper, a subspace based localization method is proposed for acoustic source using small aperture arrays. The effects of array aperture on localization are analyzed by using array response (array manifold). Besides array aperture, the frequency of acoustic source and the variance of signal power are simulated to demonstrate how to optimize localization performance, which is carried out by introducing frequency error with the proposed method. The proposed method for 5 mm array aperture is validated by simulations and experiments with MEMS microphone arrays. Different types of acoustic sources can be localized with the highest precision of 6 degrees even in the presence of wind noise and other noises. Furthermore, the proposed method reduces the computational complexity compared with other methods.