This paper describes two con"gurations of feedforward adaptive active-noise control (ANC) technique for reducing blade passing noise in centrifugal fans. In one con"guration, the control speaker is installed at the cut-o! region of the fan, while in the other con"guration at the exit duct. The propo
Adaptive Active Control Of Noise In 3-D Reverberant Enclosures
โ Scribed by C. Bao; P. Sas; H. Van Brussel
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 443 KB
- Volume
- 161
- Category
- Article
- ISSN
- 0022-460X
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โฆ Synopsis
A multi-channel active noise controller has been developed based on adaptive filtering, which can effectively work in three-dimensional (3-D) reverberant sound fields. The controller consists of adaptive filters to generate the proper anti-noise signals and an on-line estimator to track changes in the environment so that successful operation of the controller in a varying environment can be ensured. Therefore the controller is fully adaptive and does not require any pre-training or separate modelling. The performance of the controller has been verified on a test set-up. The result was found to be promising.
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The active control of a plane sound wave in a semi-infinite waveguide can require a controller with a long weighting function. In a real system constrained to act on-line, the signals are sampled and the weighting function is truncated. Both the sampling rate and the number of coefficients of the ad