externí zařízení

Úvod

Externalequipmentreferstoequipmentconnectedoutsidethecomputerhost.Itisgenerallydividedintoinputequipment,outputequipmentandexternalmemory.Externalequipmentisanimportantpartofthecomputersystem.Playtheroleofinformationtransmission,transferandstorage.Thethreetypesofequipmentareintroducedbelow.

Vstupní zařízení

Klávesnice

Thekeyboardispartofthecomputerhardware.Itisoneofthemainequipmentforinputtinginstructionsandoperatingthecomputer.Chinesecharacters,EnglishLetters,numbers,andpunctuationmarksareenteredintothecomputerthroughthekeyboard.Therearemanystylesofkeyboards,weusuallyuse101-key,105-key,108-key,etc.keyboards.Nomatterwhatkindofkeyboard,itsfunctionsandkeyarrangementarebasicallydividedintofiveareas:functionkeyarea,typingkeyarea,editingkeyarea,numerickeyboard,alsocalledsmallkeyboard,andindicatorarea.

Thecorrectoperationofthekeyboardcanreduceinputerrorsandreducefatigue.Sitinfrontofthecomputerwithyourelbowsclosetoyourbody,andyourwristsshouldbestraight.Tenfingersbendslightlyonthebasickeys.Adjustyoursittingposture,keepyourbodystraightandrelax,anddon’tbendyourback.Onlywhenyouinputthekeyscanyoupressthekeysaccuratelyandquickly.Aftertheinputiscompleted,thefingersreturntothebasickeypositions.Thestrengthshouldbeaverage,andthespeedshouldbeimprovedaccordingtothelevelofproficiency.

Myš

ThemouseisthebasiccontrolinputdeviceofWindowsandiseasiertousethanthekeyboard.ThisisduetothegraphicalfeaturesofWindowsthatneedtobespecifiedwiththemouseandmovedandclickedonthescreen.

Peninputzařízení

TheappearanceofpeninputdeviceprovidesconvenienceforinputtingChinesecharacters,anduserscaninputChinesecharacterseasilywithoutlearningotherinputmethods.Atthesametime,italsohasthefunctionsofakeyboard,amouseandawritingpen,whichcanreplacethekeyboardandmouseforinputtingtext,commandsanddrawing.

Skener

Inactualwork,theremaybealargenumberofdrawings,photosandvariouscharts,whichneedtobeinputintothecomputerforprocessing,butpictures,photosandothermaterialsarealsoIfyoucan’tdirectlyrelyonkeyboardandmouseinput,evenifyoucaninput,relyingonlyonkeyboardandmousewillbeaveryheavywork.Therefore,thescannerisnecessarytohandlethesetasks.Itinputsvariouspictures,drawings,andtextsintothecomputerthroughadedicatedscanningprogramanddisplaysthemonthescreen.Thenwecanusesomegraphicsandimageprocessingsoftwaretoperformvariouseditingandpost-processingonthepicturesandothermaterials.

Therearemanytypesofscanners.Usually,peopledividescannersintothreetypes:handheld,desktopandroller.Accordingtothetypeofscannedimage,itcanbedividedintoblack-and-whitescannerandcolorscanner.

Digitální fotoaparát

Theso-calleddigitalcameraisaspecialcamerathatcantakepicturesandconvertthecapturedscenesintoimagesstoredindigitalformatthroughinternalprocessing.Differentfromtraditionalcameras,digitalcamerascantakephotosinstantly,andyoucanseetheeffectsofthephotosyoutakethroughtheLCD.Iftheeffectsarenotgood,youcandeletethemimmediatelyandtakethenextshot.Thephotosittakesarefirstsavedinthestoragemedium,andthenoutputondemand.Digitální fotoaparátscanbedirectlyconnectedtoacomputer,TVorprinter.Undercertainconditions,digitalcamerascanalsobedirectlyconnectedtomobilephonesorhandheldPCs.Sincetheimageisprocessedinternally,theusercanimmediatelycheckwhethertheimageiscorrect,anditcanbeprintedoutorsentbye-mailimmediately.

Digitální fotoaparát

Digitální fotoaparátreferstoacamerawhoseimageprocessingandsignalrecordingallusedigitalsignals.Thebiggestfeatureofthiscameraisthatthesignalrecordedonthetapeisadigitalsignal,notananalogsignal.Digitální fotoaparátshavethefollowingcharacteristics:

external device

1.Goodimagequality:Theuseofdigitalsignalscanneglecttheinfluenceofnoiseintroducedintothecircuitpart.Theplaybackimageisclearandclean,andthequalityisexcellent;theerrorcorrectioncodingisadoptedintherecordingprocess,sothatthesignallossofthetapeduringplaybackcanbeeffectivelycompensated,andtheimagelossisless.

2.Hustota záznamu je vysoká a stroj je malý.

3.Vysoká spolehlivost.

4.Reducethecostofuse:Becausethetensionofthedigitalcameraisverysmall,thewearofthemagneticheadandthetapeiscorrespondinglyreduced,sothatthemaintenancecostiscorrespondinglyreduced,therebyreducingthecostofuse.

5.Perfectrecordingsoundquality:TheaudiopartofthedigitalvideocameraisrecordedonthetapeindigitalPCMmode,withextremelyhighfidelity.

Výstupní zařízení

Zobrazit

Thedisplayisanoutputdevice,whichacceptsR(red),G(green),Bthrougha15PIND-typeconnector(Blue)signalandfieldsynchronizationsignaltoachievethepurposeofdisplay.Thedisplaymustbecompatiblewithmultipledisplaymodesandhorizontalfrequencybandwidth.Forexample,thehorizontalfrequencyofacommonSVGAdisplaycanrangefrom31.5KHZto38KHZ,andthedisplaymustautomaticallyadjustthehorizontalfrequency,fieldfrequency,amplitudeandbrightnessofthedisplayimageaccordingtodifferentdisplays.Andotherparameters.

Therearemanytypesofdisplaysonthemarket,andthemostpopularonesarenon-radiationliquidcrystaldisplaysandotherhealthierdisplays.

Tiskárna

Inourdailywork,weoftenneedtoprintoutthedocumentsandpicturesthatwehavedoneonthecomputer.Thisrequiresaprinter,sotheprinterisgenerallyastylusprinter,Inkjetprintersandlaserprintersarethemostcommonlyused.

Duetoslowspeedandlowprecision,dotmatrixprintershavebeengraduallyeliminatedfromthehomeprintermarket.However,thecostofinjectionconsumablesislow,anditcanbemulti-layered,makingitanirreplaceablepositioninbanking,securitiesandotherfields.Laserprintershavethecharacteristicsofhighquality,highspeed,lownoise,easymanagement,etc.,andhaveoccupiedmostofthemarketintheofficefield.Comparedwiththeformertwo,inkjetprintersarealsothemainstreaminthemarket.

So,whenusingtheprinter,weshouldpayattentiontothefollowingpoints:

1.Theprintershouldbeplacedinarelativelylargespaceandnottoofarawayfromthehostandthepoweroutlet.

2.Tounderstandthebeepingsoundoftheprinter,inordertoknowitsworkingstatusatanytime.Mostprintersbuzzerwithalongbeeptoindicatethatitisreadytostartprinting,andashortbeeptoindicatethattheprinterismalfunctioning.Atthesametime,manyprintersarealsoequippedwithindicatorlights,sothatuserscanaccuratelyunderstandthestatusoftheprinter,andcanjudgewhatiswrongwiththeprinteraccordingtothebeepingsoundtohelpuserschecktheprinter.

3.Whenprintingmultiplesheetsofpaperatthesametime,shakethepaperaparttoavoidpaperjams.

4. Neotevírejte přední panel pro tisk.

Vypalovačka optických disků

Theopticaldiscburnerlooksnodifferentfromanordinaryopticaldrive,butitismuchmorepowerfulthanCD-ROMinfunction.Intermsoffunction,recordersaremainlydividedintoCD-RrecordersandCD-R/Wrecorders.CD-RburnerscanburnCD-Rdiscs,andCD-R/WburnerscanalsouseCD-R/WdiscsinadditiontoCD-Rdiscs.CD-Rdisccanonlybewrittenonce(supportingsegmentedrecording),andCD-R/Wcanbeerasedandwrittenmanytimes.Therefore,majorrecordermanufacturershavestoppedproducingCD -Rrekordéryapřepnuto na CD-RWrecordery.

Externí úložiště

Úložiště na pevném disku

Úložiště na pevném disku(harddisk)referstoamagneticsurfacestoragedevicewhoserecordingmediumisaharddisk.Inthecomputer,theharddiskisanecessaryexternalstoragedevice.Ithasthecharacteristicsoflargestoragecapacityandfastaccessspeed.Withtheimprovementofharddiskmanufacturingtechnology,itspriceisgettinglowerandlower,andthecostperformanceisgettinghigherandhigher.

Vyjímatelné úložiště

(1) Vyměnitelný pevný disk:

Removableharddiskisastoragemediumthatemphasizesportabilitybyusingharddiskasthestoragemedium.Itencapsulatesthemicroharddiskinaharddiskbox,anditsdatareadandwritemodeisthesameasthatofastandardharddisk.Therearetwotypesofmobileharddisks:2.5Inch(fornotebookcomputers)and3.5Inch(fordesktopcomputers).2.5InchTheharddiskboxofthemobileharddiskgenerallydoesnothaveanexternalpowersupply.Theharddiskboxofthe3.5Inchmobileharddiskgenerallycomeswithanexternalpowersupplyandacoolingfan.

(2)Uložiště na disku

UdiskisakindofmobilestoragethatusesthecombinationofUSBinterfaceandflashmemory(FlashMemory)technology,alsoknownasFlashdrive.Ithastheadvantagesofsmallsize,lightweight(approximately20grams),noise-freework,noexternalpowersupply,andsupportforplug-and-playandhot-plugging,makingitanidealportablestoragedevice.

Udiskstoragecapacityisusually4GB,8GB,10GB(orevenlarger),whichcanmeetdifferentneeds.Itreadsandwritesfasterthandisks,hasmorerepeatederasingtimes,andretainsdataforalongtime.Itisnotonlysuitableforstoringgeneralprogramsanddata,butalsocansimulateopticaldrivesandharddiskstostarttheoperatingsystem.

(3) Paměťová karta

Memorycard(memorycard)isasolid-statememory,usuallyrectangularorsquare.Itgenerallyusesflashmemoryasastoragemedium,alsoknownasaflashmemorycard.Thememorycardcanprovideastorageformthatcanbereadandwrittenrepeatedlywithoutanexternalpowersupply.Therearemanytypesofmemorycards,suchasCFcard(standardmemorycard),MMCcard(multimediacard),SDcard(securedigitalcard)Wait.Thememorycardhastheadvantagesofsmallsize,convenientcarrying,simpleuse,etc.,butitisnecessarytoconfigureacardreadertoreadandwritetheinformationinthememorycard.

(4)SolidStateDisk

SolidStateDisk(SolidStateDisk,SSD),alsocalledelectronicharddiskorsolidstateelectronicdisk,consistsofacontrolunitandAharddiskcomposedofsolid-statestorageunits(mainlyNANDflashdrives).Simplyput,itisaharddiskmadeofanarrayofsolid-stateelectronicmemorychips.

(5) Disketa

Floppydiskistheearliestremovablemediumusedinpersonalcomputers(PC).Floppydiskisanecessarypieceofhardwareonearlycomputers,anditisalsotheearliestremovablemediumusedoncomputers.Butfromtoday'sperspective,floppydiskshavesmallcapacity,highcostperunitcapacity,slowspeedandpoorreliability.Oncealongsidefloppydisks,therewerelargercapacityZIP,LS-120andotherrewritableremovablemedia,butitwastheemergenceofUdisks(flashdisks)thatgraduallyreplacedthelong-establishedfloppydisks.

Optická paměť

Optická paměťisamemorythatusesopticalprinciplestoreadandwriteinformation.Ithashighreliability,longlife,largestoragecapacity,lowprice,canwithstandtouchanddustinterference,andisnoteasytobescratched,buttheaccessspeedanddatatransferratearemuchlowerthanharddisks.Theopticaldiscstorageconsistsofanopticaldisc(opticaldisc)andanopticaldiscdrive(opticaldrive).CDisusedtostoreinformation,CDdriveisusedtoreadandwriteCDinformation

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