频闪喉镜的应用(2)(1)学习资料.ppt

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

2、in300ms)FootswitchtomarkpointsofinterestInstantaneousreviewofmarkedsectionsOptionalsaveofmarkedsectionsonlyRapidanimationofsimulatedvocalfoldcyclesCrosscorrelationofStroboscopicandLx(EGG)andspeechprocessingtechniquesandmeasures.SpeechStudio,aconnectedspeechana

3、lysisandoutcomemeasurementsystem,canbeaddedasasoftwareoption.FeaturesTriggeringfromSpeechorLaryngograph®signals.Instantaneoustrackingoffundamentalfrequencyand,periodbyperiod(unsmoothed)calculationoftriggeringpointunderDSPcontrol.Singleflashpervideofieldavoidsb

4、lurringduetomultipleexposures.(50or60Hz)SynchronymarkerslinkingimageandLxorSpeechcycleandphase.Thecompleteacousticwaveformfortheentirecapturedsequencecanbeviewedwiththepreciseperiodandphaseatwhichthecorrespondingimagesweretaken.Thispermitscriticalevaluationoft

5、hevalidityofthestroboscopicsequencesandgivesacontextfortheinterpretationofimagessequences,evenwherevibrationisirregularandstroboscopicmotiongivesafalseimpressionoftherealmotion.FullsoftwarecontroloflightsourceandstroboscopicfunctionsSpeechandLaryngograph®wavef

6、ormsaremarkedatthepreciseperiodandphasewheretheflashwasfired.Inthiscaseonecompleteperiodisrepresentedby8consecutivevideoimagesTheeightimagesareautomaticallyselectedanddisplayedwiththeassociatedflashmarkerontheLaryngograph®waveform.Cyclingthroughtheimagesequenc

7、eprovidesafullscreen,slowmotionanimation.Thenumberofimageschosentorepresentonecyclecanbesetinsoftware.themucosalwave,vocalfoldsymmetry,amplitude,periodicity,andcompletenessofclosurecanbeobserved.FullSystemSpecificationsAmedicalgradeisolationtransformerprovides

8、protectionviaseparateoutputsforthelightsourceandallancillaryequipment.LIGHTSOURCE:Lamp-Highefficiencyxenonlampwithintegralmirror.Maximuminput300W.Variableinputenergy0.5J-2J/flasha