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.

Active Publication Date: 2011-06-08
BRUEL & KJAER SOUND & VIBRATION MEASUREMENT
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Problems solved by technology

However, since only spherical wave functions with a common origin are used to represent the sound field, errors will be introduced in the reconstruction of the sound field on the source surface unless the source surface is also spherical and centered at the same origin
Another disadvantage of the prior art method described above is that it requires a la...

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  • Method for reconstructing an acoustic field
  • Method for reconstructing an acoustic field
  • Method for reconstructing an acoustic field

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Embodiment Construction

[0043] figure 1 A schematic block diagram of a system for reconstructing a sound field is shown. The system comprises a set of acoustic receivers 108 and an analysis unit 103 connected to the acoustic receivers.

[0044] In the following, the acoustic receiver 108 will also be referred to as a transducer. However, it should be understood that the acoustic receiver may be a microphone, hydrophone, or any other suitable device for measuring an acoustic characteristic such as sound pressure, sound pressure gradient, particle velocity, and / or other linear quantities, or combinations thereof . exist figure 1 In an embodiment of the present invention, the transducers 108 are implemented as an array 102 of transducers, wherein the transducers 108 are arranged in a regular grid (eg, a 1-dimensional grid, a 2-dimensional grid, or a 3-dimensional grid). While the arrangement in a regular grid allows for efficient numerical implementation, other geometries may be used. In some embod...

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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.

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...

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Application Information

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IPC IPC(8): G01H3/12
CPCG01H3/125
Inventor J.哈德J.戈梅斯
Owner BRUEL & KJAER SOUND & VIBRATION MEASUREMENT
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