Acoustic Beamforming over Sensor Networks

Speaker:	Professor Kung YAO
		Department of Electrical Engineering
		UCLA

Title:		"Acoustic Beamforming over Sensor Networks"

Date:		Tuesday, 22 May 2007

Time:		4:00pm - 5:00pm

Venue:		Lecture Theatre F
		(Leung Yat Sing Lecture Theatre, near lift nos. 25/26)
		HKUST

Abstract:

In this seminar, we consider three different acoustic array beamforming
methods and associated sensor networking issues.  The first array uses
four uniformly-spaced hearing aid microphones to perform a steerable array
based on the maximum-energy criterion.  A system implemented with a DSP
processor board collected various experimental data in an anechoic chamber
and a regular room for hearing aid applications.  The second array uses
randomly distributed microphones and geophones to perform wideband
beamforming based on a maximum eigenvector array for vehicle detection,
localization, and signal enhancement.  The third array is based on the
Approximate Maximum-Likelihood (AML) criterion to estimate single or
multiple acoustic sources for near-field localization and far-field
direction-of-arrival estimations.  This array is capable of various
beamforming and nulling operations.  A wireless linked system using iPAQs
with 802.11 radio cards as well as a custom-built wireless system with
sensor node self-localization capability utilizing the AML beamforming
algorithm have been implemented for different applications and scenarios.
Several sound demonstrations will also be given.


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Biogrpahy:

Kung YAO received the B.S.E. (Highest Honors), M.A. and Ph.D. degrees in
electrical engineering all from Princeton University, Princeton, N.J.
Presently, he is a Distinguished Professor in the Electrical Engineering
Department at UCLA.  From May-June 2007, he will be the Royal Society Kan
Tong Po Visiting Professor at Hong Kong Polytechnic University.  In
1985-1988, he served as an Assistant Dean of the School of Engineering and
Applied Science at UCLA.  His research interests include sensor array
system, digital communication theory, wireless radio system, digital and
array processing, systolic and VLSI algorithms. He has published over 250
journal and conference papers.  Dr. YAO received the IEEE Signal
Processing Society's 1993 Senior Award in VLSI Signal Processing.  He was
the co-editor of a two volume series of an IEEE Reprint Book on "High
Performance VLSI Signal Processing," IEEE Press, 1997.  He has served as
Associate Editors for IEEE Transactions on Information Theory, IEEE
Transactions on Signal Processing, IEEE Transactions on Circuits and
Systems, IEEE Communications Letters, and guest editors of numerous
Special Issues.  He is a Life Fellow of IEEE