Method for reconstructing an acoustic field

A sound field and acoustic technology, applied in the field of acoustic field reconstruction, which can solve the problems of a large number of measurement positions, accurate reconstruction of the sound field on the surface of a non-planar source, and the introduction of errors, etc.
CN102089633AActive Publication Date: 2011-06-08BRUEL & KJAER SOUND & VIBRATION MEASUREMENT
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BRUEL & KJAER SOUND & VIBRATION MEASUREMENT
Publication Date
2011-06-08

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Abstract

Disclosed herein is a method of reconstructing a sound field. The method comprises receiving measured values indicative of a first acoustic quantity measured at a set of measurement locations; defining a set of virtual source locations; and computing a second acoustic quantity for at least one target location from one or more wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; wherein the one or more wave functions are weighted by respective one or more weighting factors, and wherein computing comprises determining the one or more weighting factors from a least-norm fit of the one or more wave functions to the received measured values.
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Description

technical field

[0001] The invention relates to the reconstruction of acoustic fields. Background technique

[0002] Near-field Acoustical Holography (NAH) is a very useful tool for 3D visualization of acoustic radiation and precise noise source localization based on measurements on surfaces near the sound source. Its ability to reconstruct also evanescent wave components ensures very high spatial resolution.

[0003] Known near-field acoustic holography methods are based on regular-grid measurements across level surfaces in a separable coordinate system, allowing the NAH calculation to be performed by the spatial discrete Fourier transform (DFT), See, eg, "Sound source reconstruction using a microphone array," by E. G. Williams, J. D. Maynard, and E. J. Skudrzyk, J. Acoust. Soc. Am. 68, 340-344 (1980). Due to the use of DFT, the processing is very fast, but side effects of using DFT include severe spatial windowing effects unless the measurement area completely covers the...

Claims

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