A Hybrid Narrowband Active Noise Control System for Uncorrelated Narrowband Disturbance

Performance of the conventional narrowband active noise control (NANC) system may degrade severely when the uncorrelated narrowband disturbance noise is present in the system. In this paper, we propose a new hybrid NANC system capable of reducing the primary noise and the uncorrelated disturbance simultaneously. First, some simple analysis is used to show why the NANC system may indicate poor performance in the presence of the uncorrelated disturbance. Next, a new hybrid NANC is proposed to tackle this problem. The new system consists of three subsystems: 1) a conventional NANC subsystem to cancel the primary noise; 2) a feedback ANC (FANC) subsystem to cancel the uncorrelated narrowband disturbance; 3) an sinusoidal noise canceler (SNC) subsystem using adaptive notch filter of linear combination which is designed to remedy the problem of common error. Extensive simulations are conducted to demonstrate the proposed system can effectively mitigate such noise, and improves considerable the overall performance of the system.