Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13809
Title: Orthogonal adaptation for multichannel feedforward control
Authors: Yuan, J 
Issue Date: 2006
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2006, v. 120, no. 6, p. 3723-3729 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: In active noise control, it is desired to generate destructive interference by model-independent control. This is possible for single-channel systems to which a recently proposed method, called orthogonal adaptation, is applicable. In this study, the new method is extended to multichannel systems. An important issue is how to optimize a feedforward controller in the minimum H2 norm sense. In practice, secondary paths of some multichannel systems may be nonminimum phase. It is a difficult problem to design H2 feedforward controllers for multichannel systems with nonminimum phase secondary paths. The problem is solved analytically here with the best achievable, a practical and an economical solution. A recursive least squares algorithm is presented for online identification of multiple paths without persistent excitations. These solutions make it possible to implement noninvasive mode-independent controllers for multichannel systems. Experiment results are presented to verify the analytical results.
URI: http://hdl.handle.net/10397/13809
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.2358012
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