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We deal with the design of active noise control systems for ventilation ducts with a pair of loud-speakers based on sampled-data optimization, in order to improve our previous study with a single loudspeaker. The resultant controller requires lower computational complexity for the implementation, compared to the standard time-varying adaptive controllers, since it is time-invariant and the order is comparable. Moreover, the effect of Swinbanks' source is automatically recovered by thedoi:10.1155/2008/253948 fatcat:zgn7xafeenhzxl2f7uwtnxiinq