Multizone active noise control for impulsive scattered sound of a rigid cylinder

Active noise control (ANC) can be applied to attenuate the scattered sound from an object, rendering it invisible to incident waves. This study proposes two secondary loudspeaker placement optimization methods for multizone ANC of impulsive scattered sound from a rigid cylinder. The first method is frequency-domain weighted least absolute shrinkage and selection operator (LASSO) algorithm, and the second method is a time-domain iterative algorithm. Based on the two methods, a broadband feedforward ANC system is presented to suppress impulsive forward-scattered and backward-scattered sound. The experimental results show that compared with the configuration of uniformly placed loudspeakers and traditional LASSO algorithms, the proposed weighted LASSO algorithm and iterative algorithm achieve better control performance in the target and observing areas with less power when controlling 500 Hz–1000 Hz impulsive scattered sound.