抄録
On active noise control in 3-dimensional acoustic field, a control effect becomes worse when an evaluation point moves. Against this problem, we proposed control with filter map. Effectiveness of this algorithm was shown by simulations and experiments. While, this method needs many memories for accumulating FIR filters. In this paper, a method that regards a FIR filter as several modal parameters is proposed for reducing required memories. Results of numerical simulations show effectiveness of control is reduced 3dB but required memories is reduced 80%. An adaptive algorithm is also proposed. The algorithm adapts the residues. Enough effectiveness is shown by numerical simulations.
