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Canon XL1 3CCD Camcorder User Manual

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Digitalformats

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‐DVformatstheoriginalvideosignalontapeusingdigitaldatasimilartothatusedbycomputers.

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Allbrightnessandcolordataisstoredinthisveryaccuratecomputer‐stylemethodandassuch

suffersnoproblemofinterferenceornoisebetweenthechannelsofthevideosignal.

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Digitalsignalsarethereforecleanerandcrisperthananalogsources.

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Belowarethemostpopularacquisitionformatsofdigitalvideo:

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•DV25(DV):

‐Thisformatismostcommonlyknownbythephysicalconnectionstandardituses,

IEEE‐1394orFireWire

‐Itrevolutionizedthevideoeditingindustry

‐Videoiscompressed5:1duringacquisitionorrecordinginordertoreducethedatarateofthesignal

to25Mbps,andisonlyslightlyhigherqualitythantheS‐Videoanalogformat.

‐Higher‐endDVcamcorderscanproduceaDVsignalthatisalmostasgoodascomponentanalog

videoatthesameDVdataratebecauseofbetterrecordingtechnology.

‐TheDVformatincludesaseriesofcomputer‐style1sand0sandnoanalog

‐Thedataonthecomputerisexactlythesamedataasonthetape,sotheresultisaperfectcopy.

‐Manynonlinearvideoeditingapplications,likeAdobePremierePro,canreadandeditthisformat

natively,andfinishedvideoisvirtuallythesameastheoriginalsourcefootage.

‐Fewtonoprocessingerrorsareintroduced.

‐BoththeaudioandvideosignalsarecarriedonasingleFireWireorIEEE1394cable.Thecablealso

carriesdevicecontrolsignalsthatallowthecomputertocontroltheDVcamcorder.

‐InadditiontoDV25,thereareanumberofotherpopularDVformats,suchasDV50andDV100,

whichhavedataratesof50Mbpsand100Mbps,respectively.

‐AdobePremiereProsupportsDV25andDV50overstandardFireWireports.

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•SDi(serialDigitalinterface):

‐High‐end,professionalformatfordigitalsignals.

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