基于matlab的FIR数字滤波器设计.pdf

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1、基于Matlab的FIR数字滤波器设计摘要：在数字信号处理中,由于信号中经常混有各种复杂成分，所以很多信号分析都是基于滤波器而进行的，因此数字滤波器占有极其重要的地位。在数字控制系统中输入信号中所含的干扰对系统的性能会产生很大的影响，因此需要对输入信号进行处理，以提取有用信号。有限长冲激响应（FIR）滤波器在数字信号处理中发挥着重要作用，采用Matlab软件对FIR数字滤波器进行仿真设计，简化了设计中繁琐的计算。本文采用窗函数法，频率采样法通过调用Matlab函数设计FIR数字滤波器。绘制对应的幅频特性曲线。最后用基于Matlab函数设计的FIR数字滤波器进行语音滤

2、波处理，通过滤波前后信号的频谱图和生成的声音文件的对比，分析不同滤波器的滤波效果。关键词：FIR数字滤波器，仿真，窗函数法，频率抽样法，MatlabIDesignoftheMATLAB-basedFIRdigitalfilterAbstract:Indigitalsignalprocessing,becausethesignalisoftenmixedwithavarietyofcomplexcomposition,soalotofsignalanalysisarebasedonthefilter,digitalfilteroccupiesanextremelyim

3、portantposition.Indigitalcontrolsystem,interference,whichismixedintheinputsignal,hasagreateffectonperformanceofthesystem.Therefore,processingofinputsignalhastobedonetogetusefulsignal.Finiteimpulseresponse(FIR)filterplaysanimportantroleintheprocessingofdigitalsignal.DesigningtheFIRfilte

4、rbyMatlabcansimplifythecomplicatedcomputationinsimulationandimprovetheperformance.Byusingthemethodsofwindowfunction,frequencysampling,thedesignofFIRdigitalfilterhasbeenprocessedinMatlab.IntheviewofthedesignedprogramofMatlabandthefigureoftheamplitude-frequencycharacterization.Atlast,byu

5、singtheFIRdigitalfilterswhichhavebeendesignedtoprocessthesoundsignalbasedontheMatlabfunction,thefilteringeffectofdifferentdigitalfiltersisanalyzedbycomparingthesignal’sspectrumviewersandthesoundfileswhichhavebeengenerated.TheexperimentalresultsshowthattheFIRfiltersdesignedinthispaperar

6、eeffective.Keywords:FIRdigitalfilter,simulation,windowingmethod,frequencysamplingmethod,MatlabII目录摘要................................................................IAbstract...........................................................II第一章绪论...............................................

7、........11.1Matlab简介.................................................11.1.1MATLAB的发展........................................11.1.2Matlab的主要功能....................................21.2Matlab的优势及特点.........................................21.2.1MATLAB的优势...................................