Kobayashi Y., Fujioka H.

In this paper we examine inexpensive implementation of active noise control systems for one-dimensional duct based on experiments carried out by using an actual ventilating system installed in a house. Firstly, conventional adaptive control methods such as the filtered-x LMS algorithm are used to implement active noise control systems, and the possibility of controller (adaptive filter) order reduction and of loudspeaker/microphone locations are examined to achieve desired control performance. Secondly, robust control methods such as H infinity control are applied to show feasibility of non-adaptive active noise control system for low cost implementation. To do that, the generalized plant in the design problem is derived without using the driving signal of noise speaker, as opposed to in literatures which deal with robust active noise control systems, since there is no noise loudspeaker in the actual ventilating system.