InformationInputandOutput信息的输入和输出

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1、PresentationofInput&OutputDevicesPreparedbyBernard,Angela&VivianInput&OutputDevicesToolsforpeopletointeract&communicatewithcomputers.EnterdatausinginputdevicesComputergiveusbacktheresultsthroughoutputdevicesInputDevicesAnyhardwarecomponentthatallowstheusertoenterdata,programs,commands,anduserre

2、sponsetoacomputerTraditionalInputDevicesPoint-and-DrawDevicesKeyboardsKeyboards–themostcommonlyusedinputdeviceKeysforlettersofalphabet,numbers12FunctionkeysArrowKeysAdditionalkeysStatuslightsPoint-and-DrawDevices–allowtheusertocontrolthepointeronthescreenMouse–2/3buttons&aballunderneathBallunder

3、neathdetectsmovementsSendsignalstocomputerInstructorthemousepointeronthescreentomoveaccordinglyPoint-and-DrawDevicesTrackpadDigitizerTabletandPenJoystickTrackballTrackpointScannersandReadingDevicesCapturedatadirectlyfromthesourcedocumentTheinputprocessbecomesmoreefficientbecausemanualdataentry

4、iseliminatedOpticalScannersAlightsensinginputdeviceReadsprintedtext&graphicsResultsarestoredinrows&columnsofdotscalledaBITMAPFilescontainingthescannedobjectcanbeprinted,sentviae-mail3BasicScannerCategories(OCRandBarcodes)HandheldlabelscannersStationarylabelscannersDocumentscannersWandscannersCan

5、usecontactorlasertechnologyCommoningrocerystoresUselasertechnologyonlyCanscandocumentsofvarioussizesDataCollectionDevices-DigitalCamerasqualityismeasuredbyresolutionAudio&VideoInputAudioinputRecordingmusic,speech,orsoundeffectsSpeechrecognitionVideoinputEnteringfull-motionrecordingintoacomputer&

6、storingthevideoonaharddiskorothermediumWhatisOutput?DatathathasbeenprocessedintoausefulformcalledinformationText,graphic,audio,videoOutputDevices-anycomponentcapableofconveyinginformationtoauserMonitorsPrintersMultimediaProjectorsVoice-ResponseSystemsDisplayDevices–visuallydisplayssoftcopiesofte

7、xt,graphics,andvideoinformationColormonitor:displaystext,graphicsandvideoinformationincolorMonochromemonitor:displaytext,graphicsandvideoinformationinonecolorPrintersProducehardcopies(printouts)oftext,graphics…Printwithportr