NTSCTV原理.docx

NTSCTV原理.docx

《NTSCTV原理.docx》由会员分享，可在线阅读，更多相关《NTSCTV原理.docx（17页珍藏版）》请在冰豆网上搜索。

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