DSP implementation of a distributed acoustical beamformer on a wireless sensor platform

Author

Chen, J.C. ; Yip, L. ; Wang, H. ; Maniezzo, D. ; Hudson, R.E. ; Elson, J. ; Yao, K. ; Estrin, D.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

2

fYear

2003

fDate

6-10 April 2003

Abstract

In this paper, we consider the use of a Compaq iPAQ 3760s, equipped with a built-in microphone and an external wireless card, for acoustic acquisition and processing to perform a distributed acoustical beamforming. Time synchronization among the microphones is achieved by the reference-broadcast synchronization method. Two beamforming algorithms, based on the time difference of arrivals (TDOA) among the microphones followed by a least-squares estimation, and the maximum-likelihood (ML) parameter estimation method, are used to perform source detection, enhancement, localization, delay-steered beamforming, and direction-of-arrival estimation. Experimental beamforming results using the iPAQs and the wireless network are reported.

Keywords

acoustic signal processing; array signal processing; direction-of-arrival estimation; least squares approximations; maximum likelihood estimation; microphones; notebook computers; synchronisation; Compaq iPAQ 3760s; DSP implementation; ML parameter estimation; TDOA; acoustic acquisition; built-in microphone; delay-steered beamforming; direction-of-arrival estimation; distributed acoustical beamformer; enhancement; external wireless card; least-squares estimation; localization; maximum-likelihood parameter estimation; reference-broadcast synchronization method; source detection; time difference of arrivals; time synchronization; wireless sensor platform; Acoustic sensors; Array signal processing; Delay estimation; Digital signal processing; Direction of arrival estimation; Maximum likelihood detection; Maximum likelihood estimation; Microphones; Time difference of arrival; Wireless sensor networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-7663-3

Type

conf

DOI

10.1109/ICASSP.2003.1202437

Filename

1202437