5 input and output devices

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5 input and output devices

  1. 1. Input and Output devicesLecture 5Zikria Mian
  2. 2. • Define Input• Describe keyboard, pointers and scanners• Describe image capturing, digitizing andaudio input devices• Define output• Describe monitors, printers and audiooutputs• Discuss combination input and outputdevices
  3. 3. • Input and output devices are an interfacefor the users to interact with the computer.• Computer understands binary languageonly.• Input devices translate numbers, letters,actions etc that people understand into aform that computers can process whereasoutput devices translate machinelanguage into a form that people canunderstand.
  4. 4. Input Devices• Scanning devices– Optical scanners– Barcode readers– Character and mark recognition devices• Magnetic-ink character recognition• Optical character/mark recognition– Other scanners?
  5. 5. Input devices (continued)• Image capturing devices– Digital cameras– Motion sensors• Digitizing devices– Graphics tablets– Digital notepads• Audio Input devices– Voice recognition systems• Discrete speech recognition• Continuous speech recognition– microphones
  6. 6. Output devices• Monitors– CRTs– Flat-panel– Projectors– E-book readers– HD TVs– Features• Resolution, dot pitch, refresh rate, screen size
  7. 7. Output devices (continued)• Printers– Dot-matrix– Inkjet printers– Photo printers– Laser printer– Features• Resolution, Colour capability, Speed,Memory• Audio output
  8. 8. Combined input/output devices• Fax machines / MFDs• Internet telephones• Touchscreens• Smart boards• Joysticks?• ………
  9. 9. Summary• Definition of input and output device• Input devices– Scanners, Image capturing devices, Digitizingdevices, Audio inputs• Output devices– Monitors, printers, audio outputs, othermechanical or robotic reactions*• Combined input/output devices
  10. 10. Summary• Definition of input and output device• Input devices– Scanners, Image capturing devices, Digitizingdevices, Audio inputs• Output devices– Monitors, printers, audio outputs, othermechanical or robotic reactions*• Combined input/output devices

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