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Archives of Acoustics

The Journal of Institute of Fundamental Technological of Polish Academy of Sciences

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An Introduction to Virtual Phased Arrays for Beamforming Applications

12 / Keith R. Holland1 / Dolores García Escribano2 / Hans-Elias de Bree2

1Institute of Sound and Vibration Research University of Southampton SO17 1BJ, Southampton, UK

2Microflown Technologies Tivolilaan 205, 6824 BV, Arnhem, the Netherlands

© 2014 Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN). This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

Citation Information: Archives of Acoustics. Volume 39, Issue 1, Pages 81–88, ISSN (Online) 2300-262X, DOI: 10.2478/aoa-2014-0009, March 2015

Publication History

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Sound localization problems are usually tackled by the acquisition of data from phased microphone arrays and the application of acoustic holography or beamforming algorithms. However, the number of sensors required to achieve reliable results is often prohibitive, particularly if the frequency range of interest is wide. It is shown that the number of sensors required can be reduced dramatically providing the sound field is time stationary. The use of scanning techniques such as “Scan & Paint” allows for the gathering of data across a sound field in a fast and efficient way, using a single sensor and webcam only. It is also possible to characterize the relative phase field by including an additional static microphone during the acquisition process. This paper presents the theoretical and experimental basis of the proposed method to localise sound sources using only one fixed microphone and one moving acoustic sensor. The accuracy and resolution of the method have been proven to be comparable to large microphone arrays, thus constituting the so called “virtual phased arrays”.

Keywords: beamforming; source localization; virtual phased arrays; measurement techniques


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