基于频率采样法的线性相位滤波器设计及Matlab仿真  

Design of linear phase filters based on frequency sampling method and Matlab simulation

作　　者：蔡建平[1] 黄晓红[1] 孙丽英[1] 朱艺[1] 

机构地区：[1]河北理工大学信息学院,河北唐山063000

出　　处：《电力自动化设备》2006年第7期59-61,共3页Electric Power Automation Equipment

摘　　要：根据第1个频率采样点的不同有2种频率采样法来设计线形相位有限脉冲响应(FIR)滤波器,分别对应2种传输函数。传统的频率采样法设计线性相位滤波器时要考虑采样点的相位特性。通过研究傅里叶变换性质,对其步骤进行了改进,可以不考虑采样点的相位特性,通过对频率采样点向量H(k)乘以移位因子来直接进行滤波器的设计,算法简单易行。用Matlab进行仿真,结果表明该方法可按要求实现4种线性相位FIR滤波器。For two kinds of initial sampling points,two frequency sampling methods,corresponding to two transform functions,are used to design the linear phase FIR（Finite Impulse Response） filter. Steps of FIR filter design are improved based on the Fourier transform analysis and the filter is designed directly by multiplying the sampling vector H（k） by shifting factor without considering the phase property of the sampling point,which must be considered in traditional frequency sampling methods. The algorithm is easier. The simulation with Matlab shows that the proposed method can design four kinds of linear phase FIR filters as required.

关 键 词：频率采样法 线性相位滤波器 MATLAB 

分 类 号：TN713[电子电信—电路与系统]