NDLI: Blind Acoustic Beamforming Based on Generalized Eigenvalue Decomposition

Content Provider	IEEE Xplore Digital Library
Author	Warsitz, E. Haeb-Umbach, M.R.
Copyright Year	2006
Abstract	Maximizing the output signal-to-noise ratio (SNR) of a sensor array in the presence of spatially colored noise leads to a generalized eigenvalue problem. While this approach has extensively been employed in narrowband (antenna) array beamforming, it is typically not used for broadband (microphone) array beamforming due to the uncontrolled amount of speech distortion introduced by a narrowband SNR criterion. In this paper, we show how the distortion of the desired signal can be controlled by a single-channel post-filter, resulting in a performance comparable to the generalized minimum variance distortionless response beamformer, where arbitrary transfer functions relate the source and the microphones. Results are given both for directional and diffuse noise. A novel gradient ascent adaptation algorithm is presented, and its good convergence properties are experimentally revealed by comparison with alternatives from the literature. A key feature of the proposed beamformer is that it operates blindly, i.e., it neither requires knowledge about the array geometry nor an explicit estimation of the transfer functions from source to sensors or the direction-of-arrival.
Sponsorship	IEEE Signal Processing Society
Starting Page	1529
Ending Page	1539
Page Count	11
File Size	592027
File Format	PDF
ISSN	15587916
Volume Number	15
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Eigenvalues and eigenfunctions Sensor arrays Microphone arrays Signal to noise ratio Acoustic distortion Narrowband Broadband antennas Antenna arrays Transfer functions speech distortion Blind beamforming generalized eigenvalue decomposition microphone arrays
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Electrical and Electronic Engineering

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