Active Noise Control Over Multiple Zones: Adaptive Algorithm in Time Domain

Spatial active noise control (ANC) and multizone soundfield reproduction have been active research problems that use multiple loudspeakers and multiple error microphones to control regions of interest. In this paper, we investigate the intersection of the two topics, that is multizone adaptive ANC systems. To be more specific, we derive a mathematical model based on multichannel Filtered-x Least Mean Square (FxLMS) algorithm to achieve simultaneous noise reduction over multiple regions using a single ANC system. We also build and simulate the model over two regions using two different quantities of secondary sources. The simulation results validate the theory and demonstrate the feasibility of multizone adaptive ANC.