Auxiliary noise power scheduling in active noise control systems with acoustic feedback path modeling

Abstract

This paper proposes a new method to model the acoustic feedback path in active noise control (ANC) systems. The auxiliary noise is injected to track the variation of acoustic feedback path, but it will degrade the noise reduction performance (NRP) after convergence. In most existing methods, auxiliary noise with fixed power is introduced throughout the experiment. An adaptive strategy is proposed to adapt the power of auxiliary noise in this paper. In this method, the gain of auxiliary noise is controlled by the power increment of the error signal of feedback path modeling (FBPM) filter, and the power of the input signal of anti-noise generation filter. The effectiveness of the proposed method is verified by computer simulations.