基于matlab语音信号处理设计VIP免费

Matlab语音信号处理摘要语音信号处理是研究用数字信号处理技术和语音学知识对语音信号进行处理的新兴的学科，是目前发展最为迅速的信息科学研究领域的核心技术之一。通过语音传递信息是人类最重要、最有效、最常用和最方便的交换信息形式。Matlab语言是一种数据分析和处理功能十分强大的计算机应用软件，它可以将声音文件变换为离散的数据文件，然后利用其强大的矩阵运算能力处理数据，如数字滤波、傅里叶变换、时域和频域分析、声音回放以及各种图的呈现等，它的信号处理与分析工具箱为语音信号分析提供了十分丰富的功能函数，利用这些功能函数可以快捷而又方便地完成语音信号的处理和分析以及信号的可视化，使人机交互更加便捷。信号处理是Matlab重要应用的领域之一。本设计通过下载一段语音，对其进行了时域分析，频谱分析,分析语音信号的特性。并应用matlab平台对语音信号除去噪声，进一步设计三种滤波器即高通滤波器、低通滤波器、带通滤波器，基于洪泽三种滤波器设计原理，用窗函数法设计出这三种滤波器，然后含加噪的语音信号进行滤波处理。最后对比滤波前后的语音信号的时域和频域特性，回放含噪语音信号和去噪语音信号，对比研究了IIR滤波器和FIR滤波器在信号处理尤其是信号滤波去噪方面的特性和应用。论文从理论和实践上比较不同数字滤波器的滤波效果。关键字：Matlab；语音信号；信号处理；傅里叶变换；滤波器TheDesignofAnalysisVoiceSignalAbstractSpeechsignalprocessingistostudytheuseofdigitalsignalprocessingtechnologyandknowledgeofthevoicesignalvoiceprocessingoftheemergingdisciplineisthefastestgrowingareasofinformationscienceoneofthecoretechnology.Transmissionofinformationthroughthevoiceofhumanity'smostimportant,mosteffective,mostpopularandmostconvenientformofexchangeofinformation..Matlablanguageisadataanalysisandprocessingfunctionsareverypowerfulcomputerapplicationsoftware,soundfileswhichcanbetransformedintodiscretedatafiles,thenuseitspowerfulabilitytoprocessthedatamatrixoperations,suchasdigitalfiltering,Fouriertransform,whendomainandfrequencydomainanalysis,soundplaybackandavarietyofmaprendering,andsoon.Itssignalprocessingandanalysistoolkitforvoicesignalanalysisprovidesaveryrichfeaturefunction,useofthesefunctionscanbequickandconvenientfeaturescompletevoicesignalprocessingandanalysisandvisualizationofsignals,makescomputerinteractionmoreconvenient.MatlabSignalProcessingisoneoftheimportantareasofapplication.Thedesignofmobilephonecollectionanoisyspeech,hascarriedontheanalysisintimedomain,frequencyspectrumanalysis,analysisofthecharacteristicsofspeechsignal.AndapplicationoftheMATLABplatformtothevoicesignaltoremovenoise,thefurtherdesignofthreekindsoffilterisahigh-passfilter,low-passfilter,bandpassfilter,basedontheHongzethreekindsoffilterdesign,windowfunctionmethodtodesignthethreekindsoffilter,andthenwiththeoriginalspeechsignalfiltering.Finallythecomparisonbeforeandafterfilteringthespeechsignalintimedomainandfrequencydomain,theplaybacknoisespeechsignaldenoisingandthevoicesignal,acomparativestudyoftheIIRfilterandaFIRfilterinsignalprocessingespeciallyforsignaldenoisingintermsofthecharacteristicsandapplicationof.Thetheoryandpracticefromthecomparisonofdifferentdigitalfilteringeffect.Keywords:Matlab;speechsignal;signalprocessing;FFT;filter目录摘要.................................................................................IAbstract............................................................................II第一章绪论...........................................................................11.1课题研究的背景.................................................................