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1、720p、1080P的区别和含义（Thedifferenceandmeaningof720pand1080P）ThedevelopmentofdigitalTVfrom1080ito720pto1080p1080piand720pistheinternationallyrecognizedstandardofhighdefinitionTV.TheoriginalNTSCcountriesThehomeisa1080i/60HzformatthatisthesameastheNTSCanalogTV.SomeformerPALcountries,suchasEuropeandChina
2、,haveadopteda1080i/50Hzmodel,whichisthesameasPALanalogTV.Asforthe720p,IThasbecomeanoptionalstandardduetothedeeperpenetrationofITvendorsintotheTVindustry.Currently,IThasbeguntoexpandthedomainofHDTVplayerincd-rom.EditthedevelopmentinstanceofthissectionDigitalTVstandardinJapanasanexample,accordingt
3、othedifferentdisplayformat,whichisdividedintothefollowingfivekindsofspecifications:D1:480Iformat,andNTSCanalogTVdefinition,samelinefrequencyof15.25kHzD2:480pformat,andprogreive-scanDVDspecificationsarethesame,horizontalfrequencyof31.5kHzD3:1080Iformat,resolutionof1920x1080I/60hz,horizontalfreque
4、ncyof33.75kHzD4:720pformat,resolutionof1280x720p/60hz,horizontalfrequencyof45kHzD5:1080pformat,resolutionof1920x1080progressivescan,professionalformat(ps:=16:9;1920-1080,1280:720=16:9)withD31080Iasbasicformatsofhighdefinitiontelevision,butalsocompatiblewith720pformat.The1080poftheD5specification
5、istheadvancedprofessionalmodel,whichiswidelyusedinTVandfilmproduction.The1080iand720pTVsignalssentbytheTVstationsareallbroadcastfromthe1080psignalsource.Itcanbeseenthat1080pisaDEfactostandard,but1080pisnotcurrentlyusedinthecivildomain.1080pisnotonlyonekindof60Hzfieldfrequency,buttheactualapplica
6、tionis24Hz,25Hzand30Hz.Weknowthatmoviesareplayedin24framesasecond.Digitalimagestakenin1080p/24HzcanbetransmittedwithoutlosstodigitalfilmprojectorssuchasDLP/d-ila,whichareplayedinfilmformat.1080p/24Hzisaformatforfilmpreparation.Ifyoutakea1080p/25Hzformatforhighdefinition,youcaneasilybreakthe1080p
7、imageofafull1080pimageintwoframesperframe.The1080p/25Hzformathasbecomea1080i/50Hzimage,whichcanbeusedinthedigitalhighdefinitionTVoftheoriginalPALcountriesinEuropeandChina.Similarly,1080p/30Hzcanalsobeeasilyconvertedto1080i/6
