Activ e Nois e Canceliatio n for a Three-Dimensiona i Enclosur e by Using IVIultiple-Channe l Adaptiv e Contro l and Woo Contro l

Active noise control (ANC) techniques for a three-dimensional enclosure are com­ pared in terms of two control structures and two control algorithms. The multiplechannel filtered-x least-mean-square (FXLMS) algorithm and the Ho= robust control algorithm are employed for controller synthesis. Both feedforward and feedback control structures are compared. The Youla's parameterization is employed in the formulation of the multiple-channel feedback FXLMS algorithm. The algorithms are implemented using a floating-point digital signal processor (DSP). Experiments are carried out to validate the ANC approaches for attenuation of the internal field in a rectangular wooden box. Position and number of actuators and sensors are also investigated. A broadband random noise and an engine noise are chosen as the primary noises in the experiments. The experimental results indicate that the feedfor­ ward structure yields a broader band of attenuation than the feedback structure. The FXLMS control and H«, control achieve comparable performance.

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