基于窗函数的FIR数字滤波器设计

FIR数字滤波器在图像处理、数据传输等场合具有广泛应用，其设计是信号处理的核心问题之一.软件实现数字滤波优势体现在滤波器参数的改变伴随滤波器性能的改变.阐述了数字滤波器的设计方法,讨论了FIR线性相位的条件和幅度特性，并以矩形窗和布拉克曼窗为例，在MATLAB软件中实现了滤波器的仿真设计.仿真表明：借助计算机软件设计数字滤波器的过程简便易行，滤波性能指标均能达到指定的要求，对数字滤波器的推广应用有一定的促进作用.

Design of FIR Digital Filter Based on Window Function

The FIR digital filter is widely used in many fields which require the signal path with linear phase,such as image procession,data transmission,and so on.The filter performance can be easily changed with the varying filter parameters.This article elaborates the designing thought of digital filter,and discusses the linear phase condition and margin characteristic of FIR.And then,it sets the rectangle window and Blackman window as examples,realizes the filter’s simulation design by means of MATLAB.The simulation result showed that the procedure was simple and easy to be achieved when designing digital filter with the help of computer software,and all the filtering norms could reach the assigned claim.It may promote the digital filter’s application.