英文学术报告.ppt
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英文学术报告.ppt
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ModelingtheQoEofRateChangesinSkype/SILKVoIPCalls,Layout,BACKGROUNDPRELIMINARYEXPERIMENTPROPOSEDMODELFixed-RateModelVariable-RateModelLARGE-SCALEEXPERIMENTEVALUATIONCONCLUSIONANDFUTUREWORK,Background,THEEFFECTIVEend-to-endtransportofdelay-sensitivevoicedatahaslongbeenasubjectofstudyinmultimedianetworking.user-centricapproachrateadaptationmechanismsWeberFechnersLawEarlyrate-controlmechanismsattemptedtoimproveQoSforthedatadelivered.Anincreasingtrendinthisareaistomeasurenetworkservicesusingthequalityofexperience(QoE).QoSQoESynergyrateadaptationmechanismsQoE-BasedAdaptationPsychophysics,PRELIMINARYEXPERIMENT,MOSbit-rateplotoffixedratetests,Thepurposeofthepreliminaryexperimentinthisstudywastoexamine,throughusertests,whetherchangesinsendingratesdecreasestheuserexperience,andatwhatscaletheMOSisinfluencedbythemagnitudeandfrequencyofchanges.,PROPOSEDMODEL,A.Fixed-RateModel,wherebristhebitrate,and,andarecoefficientstobedeterminedbySILKcharacteristics.Thebit-rateshift()iscausedbythelimitofhumanperception.Accordingtotheformula,thetermbr-,beinginsidetheoperator,canonlybepositive.,PROPOSEDMODEL,B.Variable-RateModel,wheretheeffectofchangefrequencyisdistributedtothelogarithmterm,andtheeffectofhrandlrisdistributedtothetwosubroutines,SCALE()andSHIFT().,LARGE-SCALEEXPERIMENT,A.ANOVATests,NonparallelMOSTrelationshipsindicateinteraction,Inthat,andarethemeanandstandarddeviationofallscoresobtainedfromtracksofthesame(hr,lr)pair.Thez-scorewasthenusedforANOVAtests.,LARGE-SCALEEXPERIMENT,B.ModelSpecifics,1)CoefficientsofFixed-RateFormula,2)SubroutineofVariable-RateFormula,3)SubroutineofVariable-RateFormula,EVALUATION,A.PredictionAccuracy,Goodnessoffitoftrainingdata,ThescatterplotinFigshowsthefittedscore(asthe-axis)andtheuserscore(asthe-axis)foreachratepairandtimeintervaltestset,EVALUATION,A.PredictionAccuracy,Accuracyofprediction,Figshowstheaccuracyoftheproposedmodel.Inthisfigure,thepredictionsofbothdatasetscloselytrackthemeasureddata,regardlessofthedifferenceinaudiocontentandspeaker,EVALUATION,B.ComparisontoPESQ,1)FixedRate,Predictionerror:
SILKversusPESQforfixed-ratetracks,Forthefixed-ratecomparison,weincludedtracksinboththepreliminaryandlarge-scaleexperiment,EVALUATION,B.ComparisontoPESQ,2)VariableRate,Predictionerror:
SILKversusPESQforfixed-ratetracks,Asimilarcomparisonwasalsoconductedforvariabletracks,andtheaccuracyofpredictionofboththeproposedmodelandPESQareindicatedinFig,CONCLUSIONANDFUTUREWORK,A.QoEMeasurement,Inthisstudy,wequantifytherelationshipbetweenuserexperienceandbitratechangesforSkype/SILKcalls.,B.NetworkDesign,Asolidunderstandingofmultimediacontentisfundamentaltobetterengineeringofthenetworkapplications.,C.MultimediaContent,TakingSkypeasthefirstresearchtarget,thisstudyinvestigatestheinfluenceofdifferentbitratesandratechangesofaudiostreamsproducedbytheSILKcodec.,ThankYou!
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