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基于MATLAB的有噪声语音信号处理-南京林业大学本科毕业设计（论文）题目：基于MATLAB的有噪声语音信号处理二O一一年六月十日基于MATLAB的有噪声语音信号处理-I摘要滤波器设计在数字信号处理中占有极其重要的地位，FIR数字滤波器和IIR滤波器是滤波器设计的重要组成部分。Matlab功能强大、简单易学、编程效率高,深受广大科技工作者的欢迎。特别是Matlab还具有信号分析工具箱,不需具备很强的编程能力,就可以很方便地进行信号分析、处理和设计。利用MATLAB信号处理工具箱可以快速有效地设计各种数字滤波器。课题基于MATLAB有噪音语音信号处理的设计与实现，综合运用数字信号处理的理论知识对加噪声语音信号进行时域、频域分析和滤波。通过理论推导得出相应结论，再利用MATLAB作为编程工具进行计算机实现。在设计实现的过程中，使用窗函数法来设计FIR数字滤波器，用巴特沃斯、切比雪夫和双线性变法设计IIR数字滤波器，并利用MATLAB作为辅助工具完成设计中的计算与图形的绘制。通过对对所设计滤波器的仿真和频率特性分析，可知利用MATLAB信号处理工具箱可以有效快捷地设计FIR和IIR数字滤波器，过程简单方便，结果的各项性能指标均达到指定要求。关键词数字滤波器；MATLAB；窗函数法；巴特沃斯；切比雪夫；双线性变换基于MATLAB的有噪声语音信号处理-IIAbstractFilterdesignindigitalsignalprocessingplaysanextremelyimportantrole,FIRdigitalfiltersandIIRfilterisanimportantpartoffilterdesign.Matlabispowerful,easytolearn,programmingefficiency,whichwaswelcomedbythemajorityofscientists.Matlabalsohasaparticularsignalanalysistoolbox,itneednothavestrongprogrammingskillscanbeeasilysignalanalysis,processinganddesign.UsingMATLABSignalProcessingToolboxcanquicklyandefficientlydesignavarietyofdigitalfilters.MATLABbasedonthenoiseissuespeechsignalprocessingdesignandimplementationofdigitalsignalprocessingintegrateduseofthetheoreticalknowledgeofthespeechsignalplusnoise,timedomain,frequencydomainanalysisandfiltering.Thecorrespondingresultsobtainedthroughtheoreticalderivation,andthenuseMATLABasaprogrammingtoolforcomputerimplementation.Implementedinthedesignprocess,usingthewindowfunctionmethodtodesignFIRdigitalfilterswithButterworth,ChebyshevandbilinearReformIIRdigitalfilterdesignanduseofMATLABasasupplementarytooltocompletethecalculationandgraphicdesignDrawing.ThroughthesimulationofthedesignedfilterandthefrequencyanalysisshowsthatusingMatlabSignalProcessingToolboxcanquicklyandeasilydesigndigitalfiltersFIRandIIR,theprocessissimpleandconvenient,theresultsoftheperformanceindicatorstomeetthespecifiedrequirements.Keywords：digitalfilter;MATLAB;Chebyshev;Butterworth;Windowfunctionmethod;bilineartransformation基于MATLAB的有噪声语音信号处理-目录1．绪论.............................................................11.1研究的目的和意义........................................................................................................................21.2国内同行研究现状.......................................................................................................................21.3本课题的研究内容........................................................................................................................42.原始语音信号采集与处理............................................52.1Matlab简单介绍............................................................................................................................52.2语音信号的采样理论依据...........................................................................................................62.3语音信号的采集............................................................................................................................72.4程序流程图....................................................................................................................................72.5语音信号的时频分析....................................................................................................................82.6语音信号加噪与频谱分析...........................................................................................................92.7本章小结.....................................................................................................................................113设计数字滤波器...................................................123.1数字滤波器设计的基本思路.....................................................................................................123.2模拟滤波器概述.........................................................................................................................123.3IIR数字滤波器概述....................................................................................................................123.4FIR数字滤波器概述...................................................................................................................133.5FIR数字滤波器和IIR数字滤波器比较....................................................................................133.6低通，高通及带通滤波器.........................................................................................................143.7设计FIR滤波器.........................................................................................................................143.8设计IIR滤波器..........................................................................................................................153.9双线性变换法和窗函数法.........................................................................................................153.10本章小结...................................................................................................................................184进行滤波，比较滤波前后语音信号的波形及频谱.......................194.1验证所设计的滤波器..................................................................................................................194.2滤波.....................................................................................