Title :
A New Variable Tap-Length and Step-Size FxLMS Algorithm
Author :
Dah-Chung Chang ; Fei-Tao Chu
Author_Institution :
Dept. of Commun. Eng., Nat. Central Univ., Taoyuang, Taiwan
Abstract :
The filtered-X least mean-square (FxLMS) algorithm is widely used for active noise control (ANC). A long tap-length is usually required for some FxLMS applications, and consequentially the convergence rate becomes very slow. In this letter, a new variable tap-length and step-size FxLMS algorithm is proposed, especially suited to a long tap-length filter. Taking into account the lowpass filter effect in the secondary path of ANC, the new algorithm is developed for the control filter with an unsymmetric and two-sided exponential decay envelop over its impulse response. Simulation results show that the new algorithm provides faster convergence and cancellation performance compared to previously proposed variable-step-size FxLMS algorithms.
Keywords :
active noise control; convergence; least mean squares methods; low-pass filters; transient response; ANC; FxLMS algorithm; active noise control; control filter; convergence rate; filtered-X least mean-square; impulse response; long tap-length filter; lowpass filter effect; variable tap-length; Convergence; Indexes; Least squares approximations; Materials; Microphones; Noise; Vectors; Active noise control; FxLMS; secondary path; two-sided exponential decay envelop;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2013.2282396
