In this paper we examine inexpensive implementation of active noise control (ANC) systems for one-dimensional duct based on experiments carried out on the ventilating system installed in a real house. Two types of time-invariant low-order controllers are compared: One is based on the conventional adaptive filter (the filtered-U recursive LMS algorithm) but the coefficients are fixed by the stationary values. Another is obtained by a robust control method (sampled-data H{sub}∞ control). The experimental results show the advantage of the robust control method.
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