A generalized leaky FxLMS algorithm for tuning the waterbed effect of feedback active noise control systems. (June 2018) - Wu, Lifu
Highlights: A cost function is defined to consider the waterbed effect of the feedback ANC system directly. An algorithm is derived by replacing the scalar leaky factor in leaky FxLMS algorithm with a matrix. Abstract: To tune the noise amplification in the feedback system caused by the waterbed effect effectively, an adaptive algorithm is proposed in this paper by replacing the scalar leaky factor of the leaky FxLMS algorithm with a real symmetric Toeplitz matrix. The elements in the matrix are calculated explicitly according to the noise amplification constraints, which are defined based on a simple but efficient method. Simulations in an ANC headphone application demonstrate that the proposed algorithm can adjust the frequency band of noise amplification more effectively than the FxLMS algorithm and the leaky FxLMS algorithm.