频闪喉镜的应用(2)演示教学.ppt

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1、频闪喉镜的应用(2)BenefitsAutomaticswitchfromcontinuoustoslowmotionstroboscopicviewwhenphonationstartsNochangeincolourbalancebetweencontinuousandstroboscopiclight.FootswitchcontrolofvideoacquisitionFastcaptureoptionofimagesequencesrepresentingonevocalfoldcycle(w

2、ithin300ms)FootswitchtomarkpointsofinterestInstantaneousreviewofmarkedsectionsOptionalsaveofmarkedsectionsonlyRapidanimationofsimulatedvocalfoldcyclesCrosscorrelationofStroboscopicandLx(EGG)andspeechprocessingtechniquesandmeasures.SpeechStudio,aconnected

3、speechanalysisandoutcomemeasurementsystem,canbeaddedasasoftwareoption.FeaturesTriggeringfromSpeechorLaryngograph®signals.Instantaneoustrackingoffundamentalfrequencyand,periodbyperiod(unsmoothed)calculationoftriggeringpointunderDSPcontrol.Singleflashpervi

4、deofieldavoidsblurringduetomultipleexposures.(50or60Hz)SynchronymarkerslinkingimageandLxorSpeechcycleandphase.Thecompleteacousticwaveformfortheentirecapturedsequencecanbeviewedwiththepreciseperiodandphaseatwhichthecorrespondingimagesweretaken.Thispermits

5、criticalevaluationofthevalidityofthestroboscopicsequencesandgivesacontextfortheinterpretationofimagessequences,evenwherevibrationisirregularandstroboscopicmotiongivesafalseimpressionoftherealmotion.Fullsoftwarecontroloflightsourceandstroboscopicfunctions

6、SpeechandLaryngograph®waveformsaremarkedatthepreciseperiodandphasewheretheflashwasfired.Inthiscaseonecompleteperiodisrepresentedby8consecutivevideoimagesTheeightimagesareautomaticallyselectedanddisplayedwiththeassociatedflashmarkerontheLaryngograph®wavef

7、orm.Cyclingthroughtheimagesequenceprovidesafullscreen,slowmotionanimation.Thenumberofimageschosentorepresentonecyclecanbesetinsoftware.themucosalwave,vocalfoldsymmetry,amplitude,periodicity,andcompletenessofclosurecanbeobserved.FullSystemSpecificationsAm

8、edicalgradeisolationtransformerprovidesprotectionviaseparateoutputsforthelightsourceandallancillaryequipment.LIGHTSOURCE:Lamp-Highefficiencyxenonlampwithintegralmirror.Maximuminput300W.Variableinputenergy0.5J-2J/flashat50