Beamforming with a circular microphone array for localization of environmental noise sources

It is often enough to localize environmental sources of noise from different directions in a plane. This can be accomplished with a circular microphone array, which can be designed to have practically the same resolution over 360°. The microphones can be suspended in free space or they can be mounte...

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Bibliographic Details
Published inThe Journal of the Acoustical Society of America Vol. 128; no. 6; p. 3535
Main Authors Tiana-Roig, Elisabet, Jacobsen, Finn, Grande, Efrén Fernández
Format Journal Article
LanguageEnglish
Published United States 01.12.2010
Subjects
Acoustics - instrumentation
Computer Simulation
Environment
Equipment Design
Fourier Analysis
Models, Theoretical
Motion
Noise
Pressure
Reproducibility of Results
Signal Processing, Computer-Assisted
Sound
Sound Spectrography
Transducers, Pressure
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Summary:It is often enough to localize environmental sources of noise from different directions in a plane. This can be accomplished with a circular microphone array, which can be designed to have practically the same resolution over 360°. The microphones can be suspended in free space or they can be mounted on a solid cylinder. This investigation examines and compares two techniques based on such arrays, the classical delay-and-sum beamforming and an alternative method called circular harmonics beamforming. The latter is based on decomposing the sound field into a series of circular harmonics. The performance of the two signal processing techniques is examined using computer simulations, and the results are validated experimentally.
ISSN:1520-8524
DOI:10.1121/1.3500669