Modified narrowband active noise control system with frequency mismatch tolerance

A common system used for canceling sinusoidal noise caused by revolving equipment such as machines, propellers and motors is the narrowband active noise control (NANC). In NANC, the frequency mismatch (FM) between a reference signal and the primary noise influences the noise reduction performance. The impact of the FM is eliminated by estimating frequency and changing the step size. The conventional method changes the step size by hand, which includes a significant expense and is not unreliabl. In this paper, a step size optimization algorithm with golden section search (GSS) and virtual system was proposed, which can automatically find the most suitable step size. The optimal step size was obtained by comparing the mean square errors at the golden section points. The virtual system was utilized to isolate the noise reduction system and the step size optimization system. Along these lines, the proposed method enhanced the noise decrement of the existing NANC system. Simulations were undertaken to evaluate the performance of the proposed algorithm.