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1、摘要语音信号处理包括语音通信、语音增强、语音合成、语音识别和说话人识别等方面。只有通过语音信号的数字处理,语音信号的好坏、语音识别率的高低,都取决于语音信号处理的好坏。因此,语音信号处理是一项非常有意义的研究课程。语音,即语言的声音,是语言符号系统的载体。它由人的发音器官发出,负载着一定的语言意义。语言依靠语音实现它的社会功能。语言是音义结合的符号系统,语言的声音和语言的意义是紧密联系着的,因此,语言虽是一种声音,但又与一般的声音有着本质的区别.语音是人们交流思想和进行社会活动的最基本手段,因此我们要对
2、语音信号进行处理分析,优化人类通信交流。本次实训用windows的录音机录制一段自己说的话(语音信号),并画出语音信号的时域波形和频谱图;在MATLAB软件平台下,给语音信号加上噪声,绘出加噪声后的语音信号时域波形和频谱;采用双线性变换法,设计一个滤波器,并画出滤波器的频率响应;用自己设计的滤波器对语音信号进行滤波,画出滤波后信号的时域波形和频谱图,并对滤波前、后的信号进行对比,画出时域波形差,分析语言信号滤波前后的变化。本次实训是利用MATLAB对语音信号进行时域和频域分析,通过MATLAB对语音进行
3、数字处理。关键词:语音;噪声;MATLAB;滤波器;信号处理22AbstractSpeechsignalprocessingincludingvoicecommunications,speechenhancement,speechsynthesis,speechrecognitionandspeakerrecognitionandsoon.Onlythroughthedigitalprocessingofvoicesignals,voicesignalsgoodorbad,highandlowspeec
4、hrecognitionratearegoodorbaddependsonthevoicesignalprocess.Therefore,thevoicesignalprocessingisaverysignificantresearchprograms.Voice,thevoiceofthelanguageisthecarrieroflinguisticsignsystems.Itisissuedbythehumanvocalorgans,loadacertainamountoflinguisticm
5、eaning.Languagedependentvoicetoachieveitssocialfunction.Languageisthecombinationofsoundandmeaningofthesymbolsystem,language,themeaningofthevoiceandlanguagearecloselylinked,andtherefore,althoughthelanguageisavoice,butthesoundingeneralisessentiallydifferen
6、t.Voicethatpeopleexchangeideasandconductthemostbasicmeansofsocialactivities,sowehavetodealwiththespeechsignalanalysisandoptimizationofhumancommunicationexchange.Thetrainingrecordataperecorderwithwindowsownwords(audiosignal),anddrawthespeechsignalintimedo
7、mainwaveformandfrequencyspectrum;IntheMATLABsoftwareplatform,tothespeechsignalwithnoise,drawnafterthespeechsignalplusnoisetimedomainwaveformandfrequencyspectrum;Bilineartransformmethod,todesignafilter,anddrawthefrequencyresponsefilter;Designedtofilterthe
8、irownfilteringofthespeechsignal,drawthefilteredsignalintimedomainwaveformandfrequencyspectrum,andfilterbeforeandafterthesignalsarecomparedtodrawdifferencetime-domainwaveformanalysislanguagesignalchangesbeforeandafterfilter