Adaptive nonlinear active noise control algorithm for active headrest with moving error microphones

Nonlinear active noise control (ANC) algorithms are used to control nonlinear noise processes. In this paper, a generalized filter bank based nonlinear ANC algorithm is proposed for active headrest application. The algorithm is used to control the noise at both ears by using two moving error microphones which are mounted on the head. Mounting of microphones can be made using a wearing item such as a hat or band. Due to this, these microphones move along with the head. The adaptive ANC algorithm is shown to be very effective for head-movement. Real-time implementation of nonlinear ANC algorithm is made using a dSpace 1104 system for both ears. The robust performance of adaptive nonlinear ANC algorithm is shown for controlling nonlinear noise process at both ears even during head movement using a pair of moving error microphones without re-estimating the secondary paths for the new position.