基于無線聲傳感器網(wǎng)絡(luò)的語音增強(qiáng)研究.pdf

1、指導(dǎo)小組成員名單胡波教授張建秋教授陸起涌教授楊濤副教授復(fù)，口大學(xué)壩Ij學(xué)位論文AbstractWirelessacousticsensornetworks(WASNs)areanextgenerationtechnologyforaudioacquisitionandprocessingWASNscancoveralargerareathansinglemicrophoneormicrophonearraysanddealwithsou

2、rcesintheareaflexiblyOneofthemajoraimsistogetpureandcleartargetspeechesinmanyapplicationsofWASNsTherefore，theresearchofspeechenhancementisofgreatsignificanceHowever，thespeechenhancementalgorithmsinWASNsaredifferentfromtr

3、aditionalsinglemicrophoneormicrophonearraysbecauseofthespecialstructureofWASNsInthisdissertation，wedividetheresearchofspeechenhancementintothreepartsandeachpartiscorrespondingtoacertainscene：onetargetsource，multipletarge

4、tsourceswithoneactivesourceandmultipleactivetargetsourcesTheonetargetsourcepartfocusonascenewherethereisonlyonetargetsourceintheWASNThekeypointofthispartismicrophoneselection，whichmeansselectingusefulmicrophonesforspeech

5、enhancementForthisproblem，weproposeanovelalgorithmforassessingmicrophoneutilityblindlyThealgorithmexploitstherelationshipbetweentheSNRandthesignal’Shigher—orderstatisticalinformation(kurtosis)infrequencydomainandthemicro

6、phoneutilityisaweightedsumofthekurtosisofeachfrequencybinThesimulationresultsshowthattheproposedalgorithmCaneffectivelyevaluatethequalityofthereceivedsignalsandgetthecomparableperformancewi也thetrueSNRThemultipletargetsou

7、rceswithoneactivesourcepartiscorrespondingtoascenewheretherearemultipletargetsourcesintheWASNandonlyonetargetsourceiSactiveateachtimeThemainaimofthispartisdeterminingtheactivitiesofthetargetsourcesWeintroducethehiddenMar

8、kovmodeltodescribetheactivityswitchingbetweenthetargetsourcesTheshort—timeenergyofthesignalreceivedbymicrophonesistheobservationaldataWeestimatethemodelparametersbasedonthemaximumlikelihoodcriterionandgettheprobabilities

9、ofactivitiesofthetargetsourcesTheactivitiesofthesourcescanbedeterminedbycomparingtheprobabilities。Thesimulationresultsshowthatthisalgorithmcaneffectivelydeterminetheactivitiesofthesourcesateachtimeanditsperformanceismuch