CUED Publications database

Beamforming correction for dipole measurement using two-dimensional microphone arrays

Liu, Y and Quayle, AR and Dowling, AP and Sijtsma, P (2008) Beamforming correction for dipole measurement using two-dimensional microphone arrays. Journal of the Acoustical Society of America, 124. pp. 182-191. ISSN 0001-4966

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Abstract

In this paper, a beamforming correction for identifying dipole sources by means of phased microphone array measurements is presented and implemented numerically and experimentally. Conventional beamforming techniques, which are developed for monopole sources, can lead to significant errors when applied to reconstruct dipole sources. A previous correction technique to microphone signals is extended to account for both source location and source power for two-dimensional microphone arrays. The new dipole-beamforming algorithm is developed by modifying the basic source definition used for beamforming. This technique improves the previous signal correction method and yields a beamformer applicable to sources which are suspected to be dipole in nature. Numerical simulations are performed, which validate the capability of this beamformer to recover ideal dipole sources. The beamforming correction is applied to the identification of realistic aeolian-tone dipoles and shows an improvement of array performance on estimating dipole source powers. © 2008 Acoustical Society of America.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:05
Last Modified: 30 Nov 2014 16:45
DOI: 10.1121/1.2931950