dsp课程设计.doc

dsp课程设计17880燕山大学课程设计说明书题目:低通FIR滤波器设计与应用学院(系):电气工程学院年级专业:11级检测二班学号:1**********学生姓名:宋健指导教师:王娜教师职称:讲师电气工程学院《课程设计》任务书课程名称:数字信号处理课程设计基层教学单位:仪器科学与工程系指导教师:王娜学号1**********学生姓名宋健(专业)班级检测二班设计题目5、低通FIR滤波器设计与应用设计技术参数令x(n)为一正弦信号[f=(1/16Hz)]加白噪声,长度为500,y=fftfilt(h,x)实现卷积运算设计要求设计低通FIR滤波器完成滤波运算。参考资料数字信号处理方面资料MATLAB方面资料周次前半周后半周应完成内容收集消化资料、学习MATLAB软件,进行相关参数计算编写仿真程序、调试指导教师签字基层教学单位主任签字说明:1、此表一式四份,系、指导教师、学生各一份,报送院教务科一份。2、学生那份任务书要求装订到课程设计报告前面。电气工程学院教务科目录摘要·········································································2第一章滤波器简介···················································································································································································································································6第二章滤波器的设计思路及参数计算···········································6第三章程序设计与仿真················································································································································································································································································12总结与体会··························································12设计与实验中遇到的问题和分析········································13参考文献····································································14摘要数字滤波技术是数字信号处理的一个重要组成部分,滤波器的设计是信号处理的核心问题之一。数字滤波器是一种用来过滤时间离散信号的数字系统,通过对抽样数据进行数学处理来达到频域滤波的目的。根据其单位冲激响应函数的时域特性可分为两类:无限脉冲响应(IIR)滤波器和有限脉冲响应(FIR)滤波器。与IIR滤波器相比,FIR的实现是非递归的,总是稳定的;更重要的是,FIR滤波器在满足幅频响应要求的同时,可以获得严格的线性相位特性。因此,它在高保真的信号处理,如数字音频、图像处理、数据传输、生物医学等领域得到广泛应用。Matlab是具有强大数值分析、矩阵运算、图形绘制和数据处理等功能的软件,已成为信息处理,特别是数字信号处理(DSP)应用中分析和设计的主要工具,运行MATLAB语言,能很容易地设计出具有严格要求的滤波器。关键字:数字滤波器、信号处理、窗函数、FIR、:设单位脉冲响应h(n)长度为N,则FIR滤波器的差分方程为:FIR滤波器的最主要的特点是没有反馈回路,因此它是无条件稳定系统。它的单位脉冲响应h(n)是一个有限长序列。对上式进行Z变换,整理后可得FIR滤波器的传递函数为:FIR数字滤波器的设计方法主要有窗函数法和频率抽样设计法,其中窗函数法是基本而有效的设计方法。2FIR滤波器的特点:(1