Abstract
This paper addresses identification of the cancelation path (CP) during the online operation of the feedback-type active noise control (ANC) systems. In the feedback-type ANC, a reference microphone cannot be installed to pickup the reference signal for the (adaptive) ANC filter. Therefore, an appropriate reference signal must be electronically generated. This requires availability of a good estimate of the CP. Furthermore, estimation accuracy of CP affects the stability and noise reduction of the ANC systems. The method proposed in this paper develops upon a previous work where two adaptive filters were used, one as ANC filter and the other as a cancelation path modeling filter (CPMF). The proposed method essentially comprises a similar structure as that of the previous method. The key objective here is to improve upon the slow convergence of CPMF. This in turn improves the noise reduction performance as demonstrated by numerical results presented in this paper.