rehan group

8/6/2019 Rehan Group

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GROUPGROUP MEMBERSMEMBERS SADAQATSADAQAT ALIALI KHANKHAN MALIKMALIK REHANREHAN AHMADAHMAD MOHAMMADMOHAMMAD JAMALJAMAL ZAEEMZAEEM RAZARAZA

SHAHZADSHAHZAD--ULUL--HAQHAQ


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INTRODUCTIONINTRODUCTION

KEYBOARDS AND KEYPADSKEYBOARDS AND KEYPADS POINTING DEVICESPOINTING DEVICES OPTICAL READERSOPTICAL READERS

MAGNETIC READERSMAGNETIC READERS CAMERASCAMERAS SOUND DEVICESSOUND DEVICES

MISCELLANEOUS INPUT DEVICESMISCELLANEOUS INPUT DEVICES


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PERSONAL COMPUTERSPERSONAL COMPUTERS SERVERSSERVERS

MINI COMPUTERSMINI COMPUTERS MAIN FRAMESMAIN FRAMES SUPER COMPUTERSSUPER COMPUTERS


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Computer, machine that performsComputer, machine that performstask, such as calculations ortask, such as calculations or

electronic communication, under theelectronic communication, under thecontrol of a set of instructions calledcontrol of a set of instructions calleda program.a program.

The program results are stored orThe program results are stored or

routed to output devices such asrouted to output devices such asvideo display monitors or printers.video display monitors or printers.Computers perform a wide variety ofComputers perform a wide variety ofa activities reliably, accurately, anda activities reliably, accurately, andquicklyquickly


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AA keyboardkeyboard containscontains keyskeys thatthat allowallow aa useruser toto enterenterdatadata andand instructionsinstructions intointo thethe computercomputer..

ADVANTAGESADVANTAGES MOST COMPUTERS ARE SUPPLIED WITH KEYBOARDS.MOST COMPUTERS ARE SUPPLIED WITH KEYBOARDS. ENTERING DATA IS FASTERENTERING DATA IS FASTER

KEYBOARDS ARE MORE RELIABLEKEYBOARDS ARE MORE RELIABLE

DISADVANTAGESDISADVANTAGES IT TAKES A LOT OF TIME TO PRACTICE IN ORDER TO TYPEIT TAKES A LOT OF TIME TO PRACTICE IN ORDER TO TYPE

QUICKLY AND ACCURATELY.QUICKLY AND ACCURATELY.

TYPING SPEEDS ARE STILL VERY SLOW WHEN COMPAREDTYPING SPEEDS ARE STILL VERY SLOW WHEN COMPAREDWITH COMPUTER SPEEDSWITH COMPUTER SPEEDS


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Keyboard, in computer science, aKeyboard, in computer science, a

keypad device with buttons or keyskeypad device with buttons or keysthat user presses to enter datathat user presses to enter datacharacters and commands into acharacters and commands into a

computer.computer. The most common EnglishThe most common English--languagelanguage

key pattern for typewriters andkey pattern for typewriters and

keyboards is called QWERTY, afterkeyboards is called QWERTY, afterthe layout of the first six letters inthe layout of the first six letters inthe top row of its keys (from left tothe top row of its keys (from left toright).right).


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The most common keyboards are:The most common keyboards are:-- 101 key enhanced keyboard101 key enhanced keyboard 104 key Windows keyboard104 key Windows keyboard 84 key Apple standard keyboard84 key Apple standard keyboard

108108-- key Apple Extended keyboardkey Apple Extended keyboard

Ergonomic KeyboardErgonomic Keyboard


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A pointing device is an input device that allows a user toA pointing device is an input device that allows a user tocontrol a pointer, which is a small symbol, on the screen.control a pointer, which is a small symbol, on the screen.

Pointing devices move some object on the screen and can doPointing devices move some object on the screen and can dosome actionsome action

MOUSEMOUSE

JOYSTICKJOYSTICK

TRACK BALLTRACK BALL

GAME CONTROLLERGAME CONTROLLER

A mouse is the most widely usedA mouse is the most widely used

pointing device on personal computes.pointing device on personal computes.

A trackball is a stationary pointing device with a ballA trackball is a stationary pointing device with a ballmechanism on its top. Track ball basically an upsidemechanism on its top. Track ball basically an upside

down mouse.down mouse.

TheThe joystickjoystick signalssignals toto aa computercomputer thethe directiondirection

andand extentextent ofof displacementdisplacement ofof handhand heldheld leverlever..

TheThe directionaldirectional andand otherother controlscontrols onon aaconventionalconventional joystickjoystick maymay bebe translatedtranslatedtoto aa joyjoy pad,pad, whichwhich enablesenables allall controlscontrols

toto bebe activatedactivated byby buttonsbuttons..


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POINTINGDEVICESPOINTINGDEVICES

LI HT PELI HT PE

TOUCH SCREETOUCH SCREE

STYLUSSTYLUS

TOUCH PADTOUCH PAD

RAPHIC TABLETRAPHIC TABLET

CO TI UED

LightLight penspens resembleresemble ordinaryordinary penspens andand areare usedused toto indicateindicate locationslocationsonon aa computercomputer screenscreen andand cancan detectdetect thethe presencepresence ofof lightlight..

AA touchtouch screenscreen isis aa touchtouch sensitivesensitive displaydisplay..

TheThe graphicsgraphics tablettablet isis anan inputinput devicedevice inin whichwhich aa stylusstylus oror cursorcursor isismoved,moved, byby hand,hand, overover aa flatflat surfacesurface..

AA stylusstylus isis aa penpen likelike pointingpointing device,device, whichwhich usesuses pressurepressure toto writewritetexttext andand drawdraw lineslines..

AA touchpadtouchpad isis aa small,small, flat,flat, rectangularrectangular pointingpointing devicedevice thatthat isissensitivesensitive toto pressurepressure andand motionmotion.. TouchpadTouchpad areare moremore oftenoften foundfoundonon notebooknotebook computerscomputers..


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MOUSEMOUSE Mouse (computer), a commonMouse (computer), a common

pointing device, basic features are apointing device, basic features are acasing with a flat bottom, designedcasing with a flat bottom, designedto be gripped by one hand; one orto be gripped by one hand; one or

more buttons on the top; amore buttons on the top; amultidirectional detection devicemultidirectional detection device(usually a ball) on the bottom; and a(usually a ball) on the bottom; and acable connecting the mouse to thecable connecting the mouse to thecomputer.computer.

Used to select items or chooseUsed to select items or choosecommands on the screen, the usercommands on the screen, the user

presses one of the mouses buttons.presses one of the mouses buttons.


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TYPES OF MOUSETYPES OF MOUSE Bus Mouse: a mouse that attaches toBus Mouse: a mouse that attaches to

the computers bus through a specialthe computers bus through a specialcard or port.card or port.

Serial Mouse:Serial Mouse:-- a mouse that attaches toa mouse that attaches tothe computer through a standard serialthe computer through a standard serialport.port.

Mechanical Mouse:Mechanical Mouse:-- A type of mouse inA type of mouse inwhich the motion of a ball on thewhich the motion of a ball on thebottom of the mouse is translated intobottom of the mouse is translated intodirectional signals.directional signals.

Optical Mouse:Optical Mouse:-- A type of mouse thatA type of mouse thatuses a pair of light emiting diodesuses a pair of light emiting diodes

(LEDs) and a special reflective grid pad(LEDs) and a special reflective grid padto detect motion.to detect motion. Optomechanical:Optomechanical:-- A type of mouse inA type of mouse in

which motion is translated intowhich motion is translated intodirectional signals through adirectional signals through acombination of optical and mechanicalcombination of optical and mechanicalmeans.means.


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JOTSTICKJOTSTICK

Joystick, a popularJoystick, a popularpointing device,pointing device,used mostly forused mostly for

playing computerplaying computergames but used forgames but used forother tasks as well.other tasks as well.

A joystick usuallyA joystick usually

has a square ofhas a square ofrectangular plasticrectangular plasticbase to which isbase to which isattached a verticalattached a vertical

stem.stem.


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LightLight Pen,Pen, aa pointingpointing devicedevice inin whichwhich thetheuseruser holdsholds aa wand,wand, whichwhich isis attachedattached toto

thethe computer,computer, upup toto thethe screenscreen andandselectsselects itemsitems oror chooseschooses commandscommands onon thethescreenscreen eithereither byby pressingpressing aa clipclip onon thethe sideside

ofof thethe lightlight penpen oror byby pressingpressing thethe lightlightpenpen againstagainst thethe surfacesurface ofof thethe screenscreen..

Light PenLight Pen


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A trackball consistsA trackball consistsof a ball resting onof a ball resting on

two rollers at righttwo rollers at rightangles to eachangles to eachother.other.

A trackball alsoA trackball also

typically has one ortypically has one ormore buttons tomore buttons toinitiate otherinitiate otheractions.actions.

TrackballTrackball


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Touch Screen, inTouch Screen, incomputer science, acomputer science, acompute screencompute screen

designed or modifieddesigned or modifiedto recognize theto recognize thelocation of a touch onlocation of a touch onits surface.its surface.

By touching theBy touching thescreen, the user canscreen, the user canmake a selection ormake a selection or

move a cursormove a cursor..

Touch ScreenTouch Screen


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Scanner, device forScanner, device forexamining an object inexamining an object indetail in order todetail in order toproduce an electronicproduce an electronicimage of it, usingimage of it, usingvisible light or anothervisible light or anotherform ofform ofelectromagneticelectromagneticradiation such as aradiation such as a

laser.laser. Optical ScannerOptical Scanner Optical CharacterOptical Character

RecognitionRecognition

Bar CodesBar Codes

ScannerScanner


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OPTICALREADERSOPTICALREADERS

SCANNERSSCANNERS

OPTICAL CHARACTERRECOGNITION

CD-ROM/DVD-ROM

BAR CODE READERBAR CODE READER

OPTICAL MARK RECOGNITION

AA scannerscanner isis aa lightlight sensingsensing inputinput deicedeice thatthat convertsconvertsprintedprinted texttext andand graphicsgraphics intointo aa digitaldigital formform thatthat cancan bebefurtherfurther processedprocessed byby thethe computercomputer..

MostMost OCROCR readersreaders includeinclude aa smallsmall opticaloptical scannerscanner forfor readingreading

characterscharacters andand sophisticatedsophisticated OCROCR softwaresoftware forfor analyzinganalyzing whatwhatisis readread..

ItIt usesuses aa laserlaser toto readread aa CompactCompact DiskDisk (CD)(CD) oror aa DVDDVD diskdisk

AA barbar codecode readerreader usesuses laserlaser beamsbeams toto readread barbar codescodes..

TheThe OMROMR readerreader firstfirst readsreads thethe answeranswer keykey sheetsheet toto recordrecord thethecorrectcorrect documentsdocuments andand matchesmatches theirtheir patternspatterns ofof lightlight againstagainstthethe answeranswer keykey sheetsheet..


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MAGNETIC READERSMAGNETIC READERS

MAGNETIC INK CHARACTER RECOGNITIONREADER

MICR reader can read text printed with magnetizedink.

MAGNETIC STRIPS READERS A magnetic strips reader detect the pattern of

magnetization and convert it to numeric data.


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CAMERASCAMERAS

DIGITAL CAMERADIGITAL CAMERA

DIGITAL VIDEO CAMERADIGITAL VIDEO CAMERA

AA digitaldigital cameracamera takestakes picturespictures andand storesstoresthethe imagesimages digitally,digitally, ratherrather thanthan onon traditionaltraditionalfilmfilm..

WEB CAMWEB CAM

AA digitaldigital DVDV cameracamera recordsrecords videovideo asas digitaldigitalsignalssignals ratherrather thanthan analoganalog signalssignals..

AA WebWeb camcam isis aa videovideo cameracamera whosewhose outputoutputdisplaysdisplays onon aa WebWeb pagepage..


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SOUNDDEVICESSOUNDDEVICES

MICROPHONEMICROPHONE

VOICE RECOGNITIONVOICE RECOGNITION

MIDI (MUSICAL INSTRUMENT DIGITAL INTERFACE

ItIt allowsallows aa useruser toto speakspeak toto thethe computercomputer totoenterenter datadata andand instructionsinstructions intointo thethe computercomputer..

VoiceVoice recognitionrecognition programsprograms dodo notnot actuallyactually understandunderstandspeechspeech;; theythey onlyonly recognizerecognize aa vocabularyvocabulary ofofpreprogrammedpreprogrammed wordswords..

ItIt IsIs thethe electronicelectronic musicmusic standardstandard devicedevice ,that,that definesdefineshowhow soundssounds areare representedrepresented electronicallyelectronically byby digitaldigitalmusicalmusical devicesdevices..


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MISCELLANEOUSINPUTMISCELLANEOUSINPUT

DEVICESDEVICES VIDEO CAPTURE CARDVIDEO CAPTURE CARD

SENSORSENSOR

TERMINALTERMINAL

ItIt isis usedused toto putput videovideo intointo aa computercomputer andand usuallyusually placedplaced insideinsidethethe computerscomputers casecase..

AA sensorsensor isis anan inputinput devicedevice thatthat cancan detectdetect externalexternal changeschanges inin ananenvironmentenvironment..

AA terminalterminal isis aa devicedevice withwith aa monitormonitor andand aa keyboardkeyboard andand thetheterminalterminal cancan alsoalso referrefer toto anyany devicedevice thatthat sendssends andand receivesreceivescomputercomputer datadata..


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QUESTIONSQUESTIONS

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