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TVequipment

Built-inTVcard

Thebuilt-inTVcardcanreceiveTVandvideosignalsofmultipleformats.Whenusingit,firstinstallitonthePCIslotofthemotherboard,andinserttheTVsignalcableintoitsTVsignalinputinterface,andtheninstallthedriverintheoperatingsystem,aswellasTVreceivingandvideocapturesoftware,andyoucanwatchTVshow.Thebuilt-inTVcardtakesupcertainsystemresourceswheninuse.

UsingthemultitaskingfeaturesoftheWindowsoperatingsystem,youcanopenawindowtowatchTVprogramswhileopeningotherprogramstowork.Inaddition,theTVcardcangenerallyuseitsownsoftwaretorecordTVprograms.Thedisadvantageofthebuilt-inTVcardisthatitissusceptibletoelectromagneticinterferencefromtheinternalcomponentsofthecomputer,whichcausesitsplaybackqualitytodecline.Inaddition,thebuilt-inTVcardcanonlywatchTVprogramswhenthecomputeristurnedon.

ExternalTVBox

ThemostcommonexternalTVboxisaTVboxwithaVGAinterface.ThiskindofTVboxcandirectlypasstheVGAinterface.MostoftheexternalTVreceiverboxescanwatchTVprogramswithoutturningonthecomputer.YouonlyneedtoturnontheswitchoftheTVboxandthemonitor,andtheexternalTVboxesaregenerallyequippedwithsimilarordinaryTVboxes.TheremotecontrolusedbytheTVcangreatlyimprovetheconvenienceofoperation.Inthepast,theexternalTVboxcouldnotrecordTVprograms,norcoulditperformvideocompression,butitwasequivalenttosimplyaddingthefunctionofwatchingTVonthecomputer.Later,manufacturersintroducedanexternalTVboxwithaUSBinterface.ThisTVboxcombinesthecharacteristicsoftheabovetwoproducts.Althoughitisanexternalproduct,itmustinstallthedriverandplaybacksoftwareintheoperatingsystemandturnonthecomputer.Canbeused.Duetotheexternaldevice,itsreceivingeffectisbetterthanthebuilt-inPCITVcard.TheTVboxwiththeUSBinterfacecanperformvideocaptureandcompression,andmostoftheTVboxeswiththeUSBinterfaceprovideexcellentvideocompressionfunctions.

Videocapturecard

Thevideocapturecardcaninputvideodataormixedaudioandvideodataoutputfromcameras,videorecorders,videodiscplayers,televisions,etc.intothecomputer,andconvertthemintoacomputerthatcanbediscernedThedataisstoredinthecomputer.Thevideocapturecardcanreceivetheanalogvideosignalfromtheinputterminal,collectthesignal,quantizeandencodeittoformadigitalsignal,andthencompressandencodeitintoadigitalvideo.Mostvideocapturecardshavehardwarecompressioncapabilities.Accordingtotheirpurposes,videocapturecardscanbedividedintobroadcast-levelvideocapturecards,professional-levelvideocapturecards,andcivilian-levelvideocapturecards.Theirgradesaremainlydifferentfromthequalityofthecollectedimages,andtheircharacteristicsareasfollows.

1.Theadvantageofabroadcast-gradevideocapturecardisthatthecapturedimageshavehighresolutionandhighvideosignal-to-noiseratio.Thedisadvantageisthatthegeneratedvideofilesrequirelargeharddiskspace.Thedatavolumeperminuteconsumesatleast200MB,anditismostlyusedtorecordprogramsproducedbyTVstations.

2.Thegradeofprofessional-gradevideocapturecardisslightlylowerthanthatofbroadcast-grade.Theresolutionofthetwoisthesame,butthecompressionratioisslightlylarger.Theminimumcompressionratioisgenerallywithin6:1.TheinputandoutputinterfacesareAVcompositeterminalandSterminal.Thistypeofproductissuitableforadvertisingcompaniesandmultimediacompaniestoproduceprograms.

3.Thedynamicresolutionofcivilian-gradevideocapturecardsisgenerallylow,andmostofthemdonothavevideooutputfunctions.

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