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1、ApplicationNoteHDandSDAnalogComponentVideoJitterandWanderMeasurementswiththeVM6000RequirementsforManagingJitterandWanderinAnalogComponentHDandSDVideoSignalsThesuccessfulcreation,processing,transmission,andSincevideoencountersdelaysinthepathfromcamerarecoverofhighqualityvideocontentdependonreliabl
2、etotheviewer’sreceiver,forprocessing,programassembly,synchronizationofeachelementthroughthesignalpath.andtransmission,andwilloftenberecordedforalaterWhilevideoelementscanbestored,changed,evenscheduledbroadcast,ittravelswithitsownsynchronizingenhancedinthedigitaldomain,theyareorganizedfirstsignals
3、.Whilethesystemisnecessarilydesignedasananalogsignalinputtothecameralens,andfinallytotoleratesomeJitterandWanderinthesignalpath,displayedasanaloglighttotheviewer.Undistortedthesearegenerallyundesirabletermsthatdegradereproductionoftheintendedvideocontentorlightpatterntherobustnessofthevideosignal
4、,andcanpossiblyalsodependsonaccuratetimingofvideoinrelationtoitscauseittofail.accompanyingsynchronizingelements,andatimingrelationshiptosignalprocessingelementsinthechainofeventsleadingtofinaldisplay.VariationsfromidealtimingarecharacterizedasJitterandWander.HDandSDAnalogComponentVideoJitterandWa
5、nderMeasurementswiththeVM6000ApplicationNoteVideoSynchronizingSignalsThecontentofananalogtelevisionpictureissynchronizedintwodimensions;horizontallybyasynchronizingpulsethatdefinesthepositionofthevideolinestartingofftheleftedgeofthedisplay,andaverticalsynchronizingpatternthatpositionsthevideostar
6、tingpointforasweepdownthedisplay.Betweenoccurrencesofthesesynchronizingsignals,everythingisfreerunning,andthesystemisnominallydesignedtoexpectanewsynchronizingsignalasthenextonecomesalong.AnalogHDandSDhorizontalsynchronizingsignalsareuniqueinthattheyaretheonlysignalelementswiththeexpectedenergyco
7、ntentattheiraveragevoltagelevels.Forexample,thereferencehorizontaltimingofanHDsignal,Figure1,ismidwayinthefasttransitionsyncrisefrommaximumnegativeinthevideosignal(negativesync)tothemaximumvoltageofthepositivesynceleme
