Input and output devices


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Input and output devices

  1. 1. Input and Output devicesBy Azam Khan8-C
  2. 2. Any machine that feeds data intoa computer is called an input device.For example, a keyboard is an inputdevice, whereas a display monitor isan output device. Input devices otherthan the keyboard are sometimescalled alternate inputdevices. Mouse, trackballs, and lightpens are all alternate input devices.
  3. 3.  A graphics tablet or digitizer is acomputer input device that enables auser to hand-draw images andgraphics, similar to the way a persondraws images with a pencil and paper.These tablets may also be used tocapture data or handwritten signatures.It can also be used to trace an imagefrom a piece of paper which is taped orotherwise secured to the surface. The device consists of a flat surfaceupon which the user may "draw" ortrace an image using anattached stylus, a pen-like drawingapparatus. The image generally doesnot appear on the tablet itselfbut, rather, is displayed on thecomputer monitor.
  4. 4.  Magnetic ink character recognition, or MICR, is acharacter recognition technology used primarily bythe banking industry to facilitate the processing andclearance of cheques and other documents. TheMICR encoding, called the MICR line, is located atthe bottom of a cheque or other voucher andtypically includes the document type indicator, bankcode , bank account number, cheque number andthe amount, plus some control indicator. Thetechnology allows MICR readers to scan and readthe information directly into a data collection device.Unlike barcodes or similar technologies, MICRcharacters can be easily read by humans.
  5. 5.  Optical character recognition, usuallyabbreviated to OCR, isthe mechanical or electronic conversion ofscanned images of handwritten, typewrittenor printed text into machine-encoded text. It iswidely used as a form of data entry fromsome sort of original paper datasource, whether documents, salesreceipts, mail, or any number of printedrecords. It is a common method of digitizingprinted texts so that they can be electronicallysearched, stored more compactly, displayedon-line, and used in machine processes suchas machine translation, text-to-speech and text mining .
  6. 6.  OMR,Shortfor optical mark recognition, thetechnology of electronicallyextracting intended data frommarked fields, such ascheckboxes and fill-infields, onprinted forms. OMR technologyscans a printed form and readspredefined positions and recordswhere marks are made on theform. This technology is usefulfor applications in which largenumbers of hand-filled formsneed to be processed quicklyand with great accuracy, such assurveys, replycards, questionnaires andballots. A common OMRapplication is the use of "bubble
  7. 7.  a strip of magnetic material on which information may be stored, as by an electromagnetic process, forautomatic reading, decoding, or recognition by a device that detects magnetic variations on the strip: accredit cardwith a magnetic strip to prevent counterfeiting.
  8. 8.  A smart card, or integrated circuitcard (ICC) is any pocket-sized card withembedded integrated circuits. Smartcards are made ofplastic, generally polyvinyl chloride, butsometimes polycarbonate. Smart cards serve as creditor ATM cards, fuel cards, mobilephone SIMs, authorization cards for paytelevision, household utility pre-paymentcards, high-security identification andaccess-control cards, and publictransport and public phone paymentcards.
  9. 9.  A touch screen is an electronic visualdisplay that the user can controlthrough simple or multi-touchgestures by touching the screen withone or more fingers. Some touchscreens can also detect objects suchas a stylus or ordinary or speciallycoated gloves. The user can use thetouch screen to react to what isdisplayed and to control how it isdisplayed .
  10. 10.  A microphone isa transducer or sensor thatconverts sound into an electrical signal.Microphones are used in manyapplications such as telephones, taperecorders, karaoke systems, hearingaids, motion picture production, live andrecorded audio engineering, FRSradios, megaphones, in radio and television broadcasting and in computers forrecording voice, speechrecognition, VoIP.
  11. 11.  The devices which are used to displaythe data to the user either in the formof hard copy or soft copy are calledoutput devices. The monitor is the mostcommon output device.
  12. 12.  A plotter is a printer that interpretscommands from a computer to make linedrawings on paper with one or moreautomated pens. Unlike aregular printer , the plotter can drawcontinuous point-to-point lines directlyfrom vector graphics files or commands.There are a number of different types ofplotters.
  13. 13.  A type of pen plotter thatwraps the paper around adrum with a pin feedattachment. The drum turnsto produce one direction ofthe plot, and the pens moveto provide the other. Theplotter was the first outputdevice to print graphics andlarge engineering drawings.Using different coloredpens, it could draw in colorlong before color inkjetprinters became viable.
  14. 14.  Flatbed plotter: A graphic plotter thatcontains a flat surface that the paperis placed on. The size of this surface(bed) determines the maximum size ofthe drawing.
  15. 15.  Micrographic plotters do not usedrums the paper or any other mediumis held on both sides at the edges bypinch wheels which give back andforth movement of the paper
  16. 16. Inkjet Plotter The inkjet plotter uses jets of ink pens.The paper is placed on a drum andinkjets with different colored inks aremounted on a carriage. These arecapable of producingmulticolored, large drawings.