2014 年 50 巻 5 号 p. 395-403
In this paper, a new ANC (Active Noise Control) system using FDSP (Frequency Domain Simultaneous Perturbation) method with automatic perturbation control, which considers controlled band, is proposed. In the proposed method, the magnitude of the perturbation signal is adjusted according to the magnitude of the present error signal. As a result, the proposed method can improve instability, which is caused by block processing, in comparison with the conventional method which uses the fixed perturbation when the error signal is large. Also, the proposed method uses smaller perturbation, which can become a noise, than the conventional method when the error signal is small. Effectiveness of the proposed method is demonstrated through experiments.