An efficient online secondary path estimation for feedback active noise control systems

Hassanpour, Hamid & Davari, Pooya (2009) An efficient online secondary path estimation for feedback active noise control systems. Digital Signal Processing, 19(2), pp. 241-249.

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Abstract

In practical cases for active noise control (ANC), the secondary path has usually a time varying behavior. For these cases, an online secondary path modeling method that uses a white noise as a training signal is required to ensure convergence of the system. The modeling accuracy and the convergence rate are increased when a white noise with a larger variance is used. However, the larger variance increases the residual noise, which decreases performance of the system and additionally causes instability problem to feedback structures. A sudden change in the secondary path leads to divergence of the online secondary path modeling filter. To overcome these problems, this paper proposes a new approach for online secondary path modeling in feedback ANC systems. The proposed algorithm uses the advantages of white noise with larger variance to model the secondary path, but the injection is stopped at the optimum point to increase performance of the algorithm and to prevent the instability effect of the white noise. In this approach, instead of continuous injection of the white noise, a sudden change in secondary path during the operation makes the algorithm to reactivate injection of the white noise to correct the secondary path estimation. In addition, the proposed method models the secondary path without the need of using off-line estimation of the secondary path. Considering the above features increases the convergence rate and modeling accuracy, which results in a high system performance. Computer simulation results shown in this paper indicate effectiveness of the proposed method.

Impact and interest:

10 citations in Scopus
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6 citations in Web of Science®

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ID Code: 58576
Item Type: Journal Article
Refereed: Yes
Keywords: Active Noise Control, Adaptive Filter, Feedback Structure, FxLMS, Secondary path
DOI: 10.1016/j.dsp.2008.06.007
ISSN: 1095-4333
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Deposited On: 25 Mar 2013 01:27
Last Modified: 23 Jul 2013 02:27

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