The paper presents a multi-channel active noise control algorithm that is designed to reject periodic noise signals of unknown frequency. The algorithm is the extension of a previously-proposed disturbance rejection algorithm in which thefrequency of the disturbance is estimated through an adaptive notch filter and the estimate is used in a feedforward disturbance rejection scheme. Improvements over the earlier approach include a better frequency estimation scheme and an extension tomulti-channel systems. Experimental results on an active noise control testbed demonstrate the validity of the analytical results and the success of the method in a practical environment.
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