A Self-tuning Feedback Active Noise Control System

Active Noise Control (ANC) systems are developing rapidly because of their improvements in environmental noise reduction. ANC is based on either feedforward or feedback control. Feedback structures are employed in applications that the reference signal is not available. The step size of filters used in ANC systems plays an essential role in performance of the system. Any variation from the appropriate value leads to divergence or inefficiency of the noise controller system. These parameters are often set exp erimentally, which is a time consuming task. In addition, there is no guaranty that the system can adapt itself with situation changes. The objective of this paper is to propose a new self-tuning feedback ANC method with online secondary path modeling. Using this technique the system calculates the parameters continuously during the operation. Results of computer simulations demonstrate robustness of the proposed method.