Online acoustic feedback path modeling in multi-channel active noise control systems using variable step-size algorithm

In this paper we have investigated the effects of acoustic feedback on multi-channel ANC system. The presence of strong acoustic feedback degrades the convergence speed of the ANC filters, and in worst case the multi-channel ANC system may become unstable. The acoustic feedback path can be modeled offline, but in most applications it is time varying, hence it needs to be modeled online when ANC is in operation. Here, we propose a Variable Step Size based method for multi-channel ANC systems with online acoustic feedback path modeling. The computer simulations are carried out, which demonstrate the effectiveness of the proposed method, in comparison with the existing methods for 1×2×2 ANC system.