PALplus - Wikipedia， the free encyclopedia.pdf

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1、2009-11-14PALplus-Wikipedia,thefreeenc…PALplusFromWikipedia,thefreeencyclopediaPALplusisanextensionofthePALanaloguebroadcastingsystemfortransmitting16:9programswithoutsacrificingverticalresolution.ItfollowedexperienceswiththeHD-MACandD2-MAC,standardsthatwereincompatiblewithexistingrecei

2、versbutfeatureda16:9aspectratio.ItwasdevelopedinGermany(UniversityofDortmundincooperationwithGermanterrestrialbroadcastersandEuropeanandJapanesemanufacturers.AstandardPALreceiverwilldisplaytheimageinletterboxformatwith432activelines,whileaPALplusreceivercanuseextrainformationhiddeninthe

3、blackbarsaboveandbelowtheimagetorecreate576linesofverticalresolution.AspecialsignaltellsthereceiverwhenPALplusisinuse,andalsowhethertheoriginalcontentwasinterlaced("Cameramode"576i50)orprogressivescanned("Filmmode"576p25).Anadditionalsignalcanenablea"GhostCancellation"feature.Aseparatef

4、eaturerelatedtoPALplusisColourPlus,whichimprovescolourdecodingperformance.Contents1Operation1.1Verticalhelper1.2Colour-plus(orCleanPAL)1.3Signalingbits2PAL-pluscompatiblesets3Availability3.1Belgium3.2Germany3.3Netherlands3.4Portugal3.5Finland3.6Greece3.7Spain3.8UnitedKingdom4History5Cri

5、ticism6Seealso7Externallinksen.wikipedia.org/wiki/PALplus1/6PDF文件使用"pdfFactoryPro"试用版本创建www.fineprint.cn2009-11-14PALplus-Wikipedia,thefreeenc…OperationWithoutPALplus,a16:9presentationhasonly432linesofverticalresolution.Thisreproducesnoticeablylessdetailthanthe576linesusedfor4:3broadcas

6、ts.AfullydecodedPALplusbroadcastrestoresthe576lineverticalresolution.Forcompatibilityreasons,thehorizontalbandwidthremainsat5.0MHz.ThismeansaPALplussignalprovidesnoextrahorizontalresolutiontocompensatefortheimagebeingstretchedacrossawiderscreen.Theresultisahorizontalresolutionthatis73%o

7、ftheverticalresolution,or51%whentheKellfactorisignored.ThePALplusstandardcomprisesthreeextensionstostandardPAL:VerticalhelperAbroadcastercreatesaPALplussignalbyscalingananamorphic16:9picturewith576linesdownto432lines,sothatthepictureappearsletterboxedonaregularPALTVset.Forlumin