10.Technologies
HDMI-TPS-TX200series–User'sManual
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Appliedfirmwarepackage:v1.3.2b3 | LDCsoftware:v2.5.7b2
10.3.
Pixel Accurate Reclocking
Signal reclocking is an essential important procedure in digital signal transmission. After passing the
reclockingcircuit,thesignalbecomesstable,jitter-free,andcanbetransmittedovermoreequipmentlike
processors,oreventcontrollers.Withoutreclocking,sparkles,noise,andjaggiesappearontheimage.
Lightware’ssophisticatedPixelAccurateReclockingtechnologyfixesmoreproblemsthangeneralTMDS
reclocking.Itremovesnotonlyintra-pairskewbutinter-pairskewaswell.ThePixelAccurateReclocking
circuiteliminatesthefollowingerrors:
Intra-pair skew
Skewbetweenthe+and-wireswithinadifferentialwirepair(e.g.Data2-andData2+).It’scausedbydifferent
wirelengthsorslightlydifferentwireconstruction(impedancemismatch)inDVIcable.Itresultsinjitter.
Inter-pair skew
Skewbetweentwodifferentialwirepairsinacable.Itiscausedbydifferentwirepairlengthsordifferent
numberoftwistsintheDVIcable.Toomuchinter-pairskewresultscolorshiftinthepictureorsyncloss.
Jitter
Signalinstabilityinthetimedomain.Thetimedifferencebetweentwosignaltransitionsshouldbeafixed
value, but noise and other effects cause variations.
Noise
Electromagneticinterferencebetweenotherelectronicdevicessuchasmobilephones,motors,etc.andthe
DVIcablearecoupledontothesignal.Toomuchnoiseresultsinincreasedjitter.