Reduction effects of correlated measurement noise in near-field acoustic holography based on bispectrum

In the practical measurement of near-field acoustic holography (NAH), measured signals on holographic grids and reference point are inevitably contaminated by some noises. These noises will be amplified in the process of NAH back reconstruction, and source reconstruction accuracy degrades. As we can...

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Bibliographic Details
Main Authors: Du Xiang-hua, Zhu Hai-chao, Mao Rong-fu, Zhu Hai-peng
Format: Conference Proceeding
Language:English
Subjects:
Acoustic measurements
Acoustics
bispectrum
correlated noise
Estimation
Holography
near-field acoustic holography
Noise
Noise measurement
Pollution measurement
reconstruction accuracy
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Summary:In the practical measurement of near-field acoustic holography (NAH), measured signals on holographic grids and reference point are inevitably contaminated by some noises. These noises will be amplified in the process of NAH back reconstruction, and source reconstruction accuracy degrades. As we can assumed that the measurement noise obeys Gaussian distribution, a method based on bispectrum is presented in this paper to overcome the shortage of convention cross spectrum based NAH. The point source model simulation shows that the influence of Gaussian correlated noise can be removed effectively, and the reconstruction accuracy is improved.
ISSN:2156-2318
2158-2297
DOI:10.1109/ICIEA.2011.5975565