1、大連理工大學(xué)碩士學(xué)位論文基于模塊化的語音信號預(yù)處理實現(xiàn)姓名：王璐申請學(xué)位級別：碩士專業(yè)：信號與信息處理指導(dǎo)教師：殷福亮20081201大連理工大學(xué)碩士學(xué)位論文ThePretreatmentoftheSpeechSignalBasedonModulesAbstractInmodeminformationtechnology，theprocessingofthespeechsignalisbecomingmoreandmoreimporta

2、ntinwhichthepretreatmentofthespeechsignalisthenecessarypartRwillimprovethequalityoftheprocessofthespeechsignalItmainlyconsistsoftheautomaticlevelcontrol，adaptivenoisesuppressionhilghlevelcompensationandhowlingsuppression

3、whicharethekeytechnologyinthispaperAutomaticLevelControl(ALC)ismainlyusedtocontrolthestrongfluctuationofspeechsignalItadjuststhelevelofthespeechsignaltothebestvaluetimelyALCmainlycontainstwopartsOneistwoclassesdynamicVAD

4、，theotherisautomaticgaincontrolbaseonRMSAdaptivenoisesuppressionisusedtopickuptherelativelypurespeechsignalfromthespeechsignalwithnoiseInthispapertherearesomeimprovementsbasedonthespectralsubtraction，suchaseliminatingthe

5、‘musicnoise’bymaskline，CS眥youtthenoisesuppressionbyleastcontr01Inadvantageofthehearingcharacteristics，ahighlevelcompositionbasedonequal—soundlinefunctionsisproposednlismethodthespeechframesarechosebyVADfirst，thencalculat

6、etheparametersofthelevelcompositionAtlastcompositingthehi曲frequencyandlowfrequencyofthespeechsignalmultipliedbytheparametersSotheequalsoundisobtainedPhaserandomizedtechniqueisproposedthroughanalyzinghowtoformthehowlingFi

7、rst，puttheoriginalsignalintopolyphaseIIRfilterstogetthesub—bandsignal；second，theexitsofhowlingisdetectedbyLMSadaptivenoahfilter；iftheresultsofthedetectionishowlingexiting，restrainitbyphaserandomizedtechniqueThemodulesoft

8、hepretreatmentofthespeechsignalmentionedabovenotonlycanprocessseparately，butalsocanworktogetherasawholesystemSoitwillusedifferentmodulesaccordingtodifferentsituationstoachievethedifferentaimsKeyWords：ALC；hidingfunction；H