Abstract
On active noise control in 3-dimensional acoustic field, a control effect becomes worse when an evaluation point moves. Against this problem, we proposed a control algorithm using filter map. Validity of this algorithm was shown by simulations and experiments. To use the method, however, the adaptive filters must be accumulated in a controller so that the required memory becomes large. We use an IIR filter in order to reduction the memory in this paper. The filter is configured by tapped-delay-line structure and lattice structure. Moreover, an algorithm for updating the filter is proposed. The validity of the algorithm and the filter is shown in numerical simulations. The results shows the algorithm can calculate desired characteristics and poles of identified system.
