アクティブノイズコントロールのための音響系のモデリングと非最小位相むだ時間系について

抄録

The dynamics of a speaker and microphone play important roles in active noise control. In this paper, we investigate the dynamics of a speaker and microphone by means of theoretical modelling and experiments. From the model identified using frequency-domain test data, it is clear that the speaker and microphone and a free sound field system comprise a time delay system with nonminimum phase. We discuss the effects on active noise control performance of unstable zeros through simulations. It is clear that in order to obtain the effect of noise reduction, the dynamics of speaker and microphone must be improved.