NTSCTV原理Word格式.docx
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NTSCTV原理Word格式.docx
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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.
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
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