audio-indexing for broadcast news abstract

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1、Audio-IndexingForBroadcastNewsSatyaDharanipragada,MartinFranz,SalimRoukosIBMT.J.WatsonResearchCenterP.O.Box218YorktownHeights,NY10598ABSTRACTstancesofcontext-dependentsub-phoneclassesareiden-tiedbygrowingadecisiontreefromtheavailabletrain-InthispaperwedescribetheIBMAudio-IndexingSystemingdataan

2、dspecifyingtheterminalnodesofthetreeaswhichisacombinationofalargevocabularyspeechrecog-therelevantinstancesoftheseclasses.Theacousticfea-nizerandatext-basedinformationretrievalsystem.Ourturevectorsthatcharacterizethetrainingdataatthespeechrecognizerwasusedtoproducethebaselinetran-leavesaremodele

3、dbyamixtureofGaussianpdf's,withscriptsfortheNISTSDR97evaluation.Wereporttheperfor-manceofthesystemontheSDR-97knownitemretrieval"diagonalcovariancematrices.EachleafofthedecisiontaskandonamorepertinentTREC-styleAudio-Indexingtreeismodeledbya1-stateHiddenMarkovModelwithtask.aselfloopandaforwardtra

4、nsition.TheIBMsystemexpressestheoutputdistributionsonthestatetransi-tionsintermsoftherankoftheleafinsteadofinterms1.IntroductionofthefeaturevectorandthemixtureofGaussianpdf'sThegoalofanaudio-indexingsystemistoprovidethemodelingthetrainingdataattheleaf.Therankofacapabilityofsearchingandbrowsingth

5、roughaudiocon-leafisobtainedbycomputingthelog-likelihoodofthetent.Thesystemisformedbyintegratinginforma-acousticvectorusingthemodelateachleaf,andthentionretrievalmethodswithlargevocabularycontinu-rankingtheleavesonthebasisoftheirlog-likelihoods.ousspeechrecognition.Alargevocabularycontinuousspee

6、chrecognitionsystemisusedtotoproducetimeForthisSDRtrackevaluationwe,onpurpose,trainedalignedtranscriptsofthespeech.InformationretrievalourrecognizerondatathatisdierentfromtheSDRtechniquesarethenemployedontheserecognizedtran-(HUB4)trainingdata.Thisenabledustojudgethescriptstoidentifylocationsint

7、hetextthatarerelevantperformanceofoursystemundermismatchconditionstothesearchrequest.Theselocationswithtimealign-whereonewishestoretrieve,asisoftenthecaseinmentsthenspecifyregionsofthespeechthatarerelevantpractice,spokendocu