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《InputOutputdevices輸入輸出設(shè)備》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
1、devices...InputsandOutputKeyboardThecommonestwaytoenterdataintoacomputer.Eachkeyissimplyaswitch,whichwhenpressed,resultsinadigitalcodebeingsenttothecomputer.MouseThemovementofthemouseoveraflatsurfaceismirroredbyapointeronthemonitorscreen.Underthemousei
2、saballwhichrollsandturnstwoshafts,oneforeachdirection-left/right&up/down.Buttonsonthemouseenableselectionstobemadefrommenus,movementofobjectsaroundthescreen,andpaintingordrawing.TouchsensitivescreenThisdeviceactslikeamousethattheusercanmovebytouchingth
3、escreen.Itisusedbypeoplewhofindusingamousedifficult,tootimeconsumingorifitmightgetstolen/damaged.BarcodereaderThebarcodeditemisswipedoveralaserscannerisswipedoverthebarcodetoreadinthedata.Itisthesameasascannerbutduetothesimplenatureofthebarcodethescann
4、ingisveryrapid.ScannerLikeaphotocopieritscansafullpagewithlaserlightbutinsteadofprintingcopies,ittransmitstheimagetothecomputerasdigitalcode,whichcanbesavedasafile.Ineffect,itperformstheexactoppositefunctiontoaprinterbyconvertingaprintedpageintoacomput
5、erfile.SpeechsynthesiserOutputdeviceusedtohelppeoplewhocan’tseevisualoutputsfromthecomputer.Itproducesahuman-likevoice.DigitalcameraLightreceivedthroughthelensisconvertedtodigitalsignalsbysensors,ratherthanstoredbychemicalchangeonafilmasinanormalcamera
6、.Theresulting"photograph"canthenbestoredonacomputerandusedjustlikeanyclipartfiles.OtherdevicesMagneticstripreader-usedoncreditcardtypedevices.Theinformationisstoredonthetapeonthebackofacard.Themachinecanreadandwritetoit.Opticalmarkreader-similartoabarc
7、odereaderbutusesinfra-redlighttoscanpencilmarksonpreparedformssuchasmultiple-choiceexaminationanswersheetsorlotterytickets.Opticalcharacterreader-usesanordinaryscannertotakeaphotographicimageofprintedorevenhand-writtentext.Specialsoftwarethenlooksatthe
8、image,recogniseseachcharacterandconvertsitintoatextfileOtherdevicesMagneticinkcharacterrecognition-usesinkcontainingmagneticparticles.Thismethodisusedbybankstoprintonachequetheamountthatitismadeoutfor,thenitisscannedintoacomputer.Printe
