Active noise control based on wavefront synthesis for a sound passing through an open window

Abstract

The conventional multi-channel active control of an incident noise passing through an open window will increase the computational burden of the control algorithm and the complexity of the hardware configuration as more control channels are used. To overcome these problems, active noise control based on wavefront synthesis is proposed. The approach is a global ANC divided into two sub-systems. The one sub-system is to reproduce the shape of the wavefront of the incident noise, and the other is to adjust the amplitude and phase of the reproduced sound to be the anti-noise by using single channel filtered-x LMS ANC. By dividing into the sub-systems, the control algorithm and the hardware configuration can be simpler than the conventional multi-channel ANC. In this paper, the effectiveness of the proposed approach is verified by numerical simulation with 2-D boundary element method.