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Two novel active noise control techniques on the basis of feedforward H 2 and H [infinity] optimal model matching principle are proposed. These methods effectively overcome the problem of unstable inverse plant resulting from the inherent non-minimum phase property of the cancellation path. The proposed algorithms are implemented by using a digital signal processor. The experimental results obtained by using H 2 and H [infinity] feedforward techniques show attenuation for stationary noise in a duct as comparable to those of conventional methods. The proposed methods also have potential in suppressing transient noises that have been the major difficulty in adaptive methods. Comparisons of the methods are summarized.
Document Type: Research Article
Department of Mechanical Engineering, Chiao-Tung University, Hsin-Chu 30050, Taiwan, Republic of China