A modified overall on-line modeling algorithm for the feedforward multiple-point ANC system

Abstract

This paper proposes a modified overall on-line modeling algorithm for application in a feedforward multiple-point active noise control (ANC) system, in which acoustic path decoupling can be improved. First, the structure of the ANC system adopting the proposed method is discussed. Second, the update equations of the system modules employing the LMS algorithm are derived. Next, the off-line initialization procedures of the system modules together with the update equations are described. Computer simulations illustrate the performance of the feedforward multiple-point ANC system adopting the proposed method. Simulation results show that the system can achieve superb low-frequency noise reduction and the reconvergence of the system error is guaranteed even when changes are encountered in the primary and secondary paths.