Discrimination of Wind Noise and Sound Waves by Their Contrasting Spatial and Temporal Properties
The spatial and temporal characteristics of outdoor wind noise are contrasted to those of unsteady acoustic signals through wavelet processing of data from a 49-microphone array. The results provide clear evidence that wind noise consists of non-planar, intermittent, and weakly coherent microgusts (small turbulent disturbances) propagating across the array. By applying beamforming algorithms to signal cross coherences calculated from complex continuous wavelet transforms (CWTs), the orientations of the microgusts and broadband acoustic signals can be deduced. Wavelet-based beamformers based on the conventional (Bartlett) steering method are shown to produce the most consistent results at low signal-to-noise ratios. A Gaussian-mixture-model classifier is formulated to distinguish between blasting sounds, unsteady but persistent sounds (music), and wind noise. Signal shape features reliably distinguish the blasting and music, whereas the relatively low coherence of the wind noise distinguishes it reliably from the acoustic signals.
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Document Type: Research Article
Publication date: November 1, 2010
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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