有源噪声控制的一种变换域算法

Active noise control using a transform-domain algorithm

有源噪声控制广泛应用于中低频噪声控制中。传统的有源控制都是在时域内使用LMS算法进行控制,由于LMS算法的收敛速度跟输入信号的自相关矩阵特征值分布有关,当特征值分布较大时,LMS算法的收敛速度会变的很慢。本文使用离散余弦变换(DCT)技术,在变换域内进行有源噪声控制的研究,同时考虑了变换域约束。仿真表明算法的有效性。

Active Noise Control (ANC) is widely used in low frequency noise control.Traditional ANC system uses LMS algorithm in time-domain. But the convergence speed of LMS algorithm depends on the eigenvalues spread of the input autocorrelation matrix.The convergence speed becomes very slow when the eigenvalues spread is very large.A transform-domain algorithm using DCT technique is presented in this paper, and the transform-domain constraint is considered. The results show that transform-domain algorithm is a more effective control algorithm.