NTSCTV原理.docx
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NTSCTV原理
Chapter1.NTSCIntroduction
RasterScanDeflectionWaveforms
FigureshowsHorizontal&VerticalSweepVoltageWaveforms,andtheirrelativetimingRelationships
InterlaceRasterScan
IllustrationofscanningbeamonCRTfaceduringInterlacescan.
InterlacedScan
IllustrationofhowInterlacingisaccompolished.
RasterScanSynchronizationWaveforms
NTSC/RS-170A,completesetofwaveforms,includingCompositeBlanking.
NoteColorSubcarrierphasing(inred).
HorizontalSyncComplex
Illustrating"FrontPorch,""SyncTip,""BackPorch"withColorBurstridingonit.
Theintervalbetweentheendofthesynctip&thestartoftheburstissometimesreferedtoasthe"Breeze-way."Notealso,the"BurstFlag"(D.C.Restoreclamp).
VerticalSyncRecovery
VerticalsyncrecoverybyIntegrationofcompositesyncwaveform.
So-called"Hammerhead"waveform
Normallyinvisiblewaveformofthe"VerticalInterval,"showingtherelationshipoftheHorizontalsyncPulses;Pre-EqualizationPulses;SerrationPulses;Post-EqualizationPulses;ColorBurst,etc.
SyncSeperator
Circuitfortherecoveryofboth,HorizontalSync&VerticalSync,aswellas,Even/OddFieldFlag.
SyncSeperator
SyncSeparatorwith"Noise"pulsesuppression--usedinterrestrialreceivers&VTR/VCRs.
HorizontalDeflection
Horizontaldeflectioncircuit,showingDrivetransistor,Damperdiode,DeflectionCoil,Resonating&linearizingCapacitors;withHighVoltageFly-backtransformer(tunedtothirdharmonicofscanningfrequency).
HorizDeflectionSequence
"L"&"C"ChargeDischargesequencingrelatedtohorizontalscanbeamposition.
NumericalRelationships
PhaseLockedLoop(PLL)
BroadcastSpectrumShaping
NTSCBroadcastsignalusesVestigialSideBand(VSB)transmission,withproperlybandlimited"I"&"Q"chromainformation.
Notealso,theauralcarrier@4.5MHz.Inpractice,thisisinsertedasahighlevelauraltransmitteroutputatthetransmittingantenna