试述机械数控专业

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1、试述机械数控专业试述机械数控专业__外文资料及翻译导读：cludinga10.2microsecondhorizontalsyncpulse,separatingonelinefromthenext.age,thesyncpulses.Thisplacethesyncbeyondtheblackrange.Invideojargon,th外文资料及译文原文：TelevisionVideoSignalsAlthoughover50yearsold,thestandardevisionsignalisstilloneofthemostmonitanimage.Figure8.3s

2、hoeaningthatthereareverticalandhorizontalsynchronization(sync)pulsesmixedation.Thesepulsesareusedintheevisionreceivertosynchronizetheverticalandhorizontaldeflectioncircuitstomatchthevideobeingdisplayed.Eachsecondofstandardvideocontains30pleteimages,monlycalledframes,Avideoengineerecontains5

3、25lines,theevisionjargonformerscallroberisalittledeceptivebecauseonly480to486oftheselinescontainvideoinformation;theremaining39to45linesarereservedforsyncpulsestokeeptheevision’scircuitssynchronizedattoreduceflickerinthedisplayedimage.Thismeansthatalltheoddlinesofeachframearetransmittedfirs

4、t,folloeconsistsoftits60fieldspersecond.Eachfieldstartsilliseconds.Thisisfolloicroseconds,includinga10.2microsecondhorizontalsyncpulse,separatingonelinefromthenext.age,thesyncpulses.Thisplacethesyncbeyondtheblackrange.Invideojargon,thesyncpulsesaresaidtobeblackerthanblack..Thehardegrabber.T

5、hisisusuallyintheformofanelectronicscardthatplugsintoaputer,andconnectstoacamerathroughacoaxialcable.Uponmandfromsoftegrabbere,asindicatedbytheverticalsyncpulses.Duringthefollopledmanytimes,typically512,640or720samplesperline,at8bitspersample.Thesesamplesarestoredinmemoryasoneroage.Thisager

6、esultsinanimportantdifferencebetagecorrespondstoonelineinthevideosignal,andthereforetooneronsarenotsostraightforns),dependingontheparticulardeviceused.oothanalogsignal,suchasinFigure8.3.InotheranycolumnsarepresentintheCCD.TheresolutioninthehorizontaldirectionislimitedbyhoHzforcolorevision,r

7、esultin试述机械数控专业__外文资料及翻译(2)导读：isaddedinthissameindividually,andrebinestheminthefinaldiplay.译文：关键词：核心，合成信号，电压耦合电视信号尽管已经拥有50年的历史了,电视信号依然是常用的传递信息的途径之一。图8.3演示了电视ginarisetimeofabout100nanoseconds,i.e,about1/500thofthe53.2microsecondvideoline.(SequentialChromi