基于diva模型脑电信号的时频研究word格式论文.docxVIP

基于diva模型脑电信号的时频研究word格式论文.docx

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基于diva模型脑电信号的时频研究word格式论文

AbstractInrecentyears,asarapiddevelopmentofelectronicinformation,communicationand computerscience,itbecomesmoreandmoreperfectfortheelectroencephalography(EEG)signal processingtheoryandtechniques.Therefore,theresearchareaofbrain-computerinterface(BCI) attractsmoreinterestsasacurrentlyhottopic,ofwhichthewaytoobtainEEGandthesubsequent patternclassificationfortheuniquecharacterextractionfromEEGplaysvitalimportanceinBCI researchsystem.EEGisanon-stationarytime-varyingsignal,carryingallkindsofinformation.An accurateanalysistoEEGcanimprovetheefficiencyoftheprocessingoftheEEG.The time-frequentanalyticaltheoryandmethod,aneffectivetoolfornon-stationarysignalanalysis,can analyzebothtimedomainandfrequencydomainsimultaneously,whichbecomesanewresearch areaofsignalprocessinginrecentyears.Asanewtheoryandmethod,ithasprovidedtheoretical significanceandapplicationvaluetodiscussthemethodsoftime-frequency.Inthispaper,themethods of time-frequencyforEEGareinvestigated as thefollowingsections:Firstofall,thebasictheoryofthetime-frequencyanalysisandseveralcommonlyused time-frequencyanalysismethodareintroduced,suchasclassicFouriertransform,ShortTime FourierTransform(STFT)andwavelettransform.ClassicFouriertransformonlyappliesto stationarysignals,whichcannotanalyzenon-stationarysignals.STFTcananalyzebrainelectrical signalsfromeithertimedomainorfrequencydomain,buttheaccuracyandresolutionarepoor. Wavelettransformcanonlyanalyzetheapproximationofthesignalcomponent,whileignores furtherdecomposition,whichwillaffectthedividedbandofnon-stationaryrandomsignal characteristics.Thus, theaccurate extraction ofthesignal characteristics will be affected.Secondly,aHighTime-FrequencyResolutionAnalysis(HTFRA)forelectroencephalography basedonDIVAmodelisproposed.AlthoughWigner-Villedistribution(WVD)cananalyze time-frequencyfornon-stationarysignalswithhighresolution,itwillintroducecrosstermsduring featureextractionbecauseofitsquadratictime-frequencyanalysismethods,whichwillaffectthe understandingoftheinformationofth

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