基于窗函数和特征滤波器的半带滤波器设计  

Half-band Filter Design Based on Windowing and Characteristics of Filter

作　　者：韩治国[1] 王红梅[1] 许辉[2] 

机构地区：[1]西北工业大学航天学院,陕西西安710072 [2]西安应用光学研究所,陕西西安710065

出　　处：《计算机仿真》2013年第8期181-184,383,共5页Computer Simulation

基　　金：西北工业大学基础研究基金(GBKY1008);陕西省科技计划项目(2012K06-06)

摘　　要：研究半带滤波器设计优化问题。半带滤波器是一种特殊的低通FIR数字滤波器,通带和阻带关于二分之一Nyquist频率对称,因而有近一半的滤波器系数为0,用来实现数字滤波可以大幅度地减少运算量,有利于滤波器的实时实现。为实现上述优化,采用两种方法来设计半带FIR滤波器,一种是传统的窗函数法,一种是特征滤波器法。基于半带FIR滤波器的频率特性,用窗函数法和特征滤波器法的半带FIR滤波器仿真结果表明,提出的方法为半带滤波器优化设计提供了参考。Research the half-band filter design optimization problem.The half-band filter is a special FIR low-pass digital filter,with its pass-band and stop-band symmetric about the half of the Nyquist frequency,almost half coefficients of the filter are zeros.This reduces the computation of filtering significantly when it is used for decimation and this makes on time filtering achievable.To achieve the above described optimization,we used two methods to design half-band filter,one was based on tradition windowing method,the other was based on the Characteristics of the filter method.Based on the frequency characteristics of the half-band FIR filter,with windowing and the characteristics of the filter method,the half-band FIR filter simulation results show that the proposed method provides a reference to optimize the design of the half-band filter.

关 键 词：半带滤波器 特征滤波器算法 窗函数 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论]