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

Volume

20

Issue

11

fYear

2013

fDate

Nov. 2013

Firstpage

1122

Lastpage

1125

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;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2013.2282396

Filename

6601623