Application of Adaptive Combined Filtered-x Affine Projection Algorithm in Feedforward Active Noise Control

The filtered-x algorithm is the most popular technology used in active noise control (ANC) system to update the controllers. This paper proposes an adaptive combined filtered-x affine projection algorithm to balance the convergence speed and noise reduction performance in ANC. The new algorithm uses a sigmoid function to adaptively combine two ANC systems with different order and step size, and a coupling factor is used to adjust the proportion of these two systems for obtaining the best properties of them. The simulation experiment results in stationary and nonstationary scenarios demonstrate the better performance of the proposed algorithm as compared with the conventional filtered-x affine projection algorithm.