Analysis and enhancement of narrowband active noise control systems with disturbance

The disturbance at error sensors will degrade the performance of active noise control (ANC) systems, resulting in slow convergence and decreased noise reduction problems. This paper analyzes the disturbance effects on narrowband ANC (NANC) systems and proposes modified algorithm to enhance both the transient and steady-state performance. A delayless bandpass filterbank is designed to eliminate out-of-band disturbance in the generated individual error signals for updating the corresponding adaptive filters. The theoretical analysis and improved performance are verified by computer simulations using measured transfer functions from the experimental setup.