摘要
在有源噪声控制系统实现过程中,次级通路特性对有源控制算法实现、系统的稳定性及降噪量都有着重要影响。文章首先研究了通路建模过程中,通路传递函数极点位置对建模精度及建模滤波器长度的影响表明:在IIR滤波器模型中,极点位置越靠近单位圆,在使用FIR滤波器进行逼近时,所需的滤波器长度越长;与极点位置对建模FIR滤波器长度的影响相比,极点个数对建模FIR滤波器长度的影响相对要小。然后以矩形封闭空间为例,通过计算机仿真深入研究了次级通路特性对有源控制的影响。仿真结果表明:在相同建模滤波器长度情况下,阻尼系数越小,有源控制效果越差。
In the implementation of active noise control, it is important for characteristics of paths to keep stability of the control system. In this paper, the relationships among the modeled filter＇s order, the plant modeling error and the location of poles for the transfer functions of the physical paths in an ANC sy-stem are examined theoretically. Taking active control of enclosed sound field as an example, characteristics of the secondary paths and its influences on active control are investigated with computer simulation.
出处
《声学技术》
CSCD
北大核心
2007年第5期933-938,共6页
Technical Acoustics
关键词
有源噪声控制
次级通路
通路建模
active noise control
secondary path
path modeling
