Presentation on Input and Output Devices

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  • 1. n Do you ever wonder how information gets into your computer and how comes out in a form you can use ? It is possible with
  • 2. Input Devices Definition : “An electromechanical device that can be used to enter data and instructions into a computer.”
  • 3. Keyboard “A keyboard is a human interface device which is represented as a layout of button or keys.” It has some Features as • Typewriter keyboard with numeric keypad • Special purpose keys • Toggle and combination keys
  • 4. Definition : “An input device used to control a pointer on the screen.” Mouse: “mouse can be used to Control and manipulate cursor movement on monitor.” Types of Mouse : i) Mechanical or wireless ii) Optical iii) Cordless
  • 5. Some pointing devices are Trackball Pointing Stick Joystick Touch Pad Touch Screen Light Pen
  • 6. Optical Input Devices “optical input devices that uses light as a source of input. They eliminate the need for manual entry of data, thus accuracy Scanner: increases. “scanners can be used to copy the image or text on paper into a digital format that can be used by the computer.”
  • 7. Other Optical Input Devices are: Optical scanners Flatbed Portable Bar code readers: “a barcode reader is an electronic device which is used for reading printed barcodes. This device directs a light beam across the bar code while it measures
  • 8. Character and mark recognition devices Scanners that recognize special characters & marks Magnetic ink character recognition (MICR) Optical-character recognition (OCR) Optical-mark recognition (OMR)
  • 9. Audio Input Definition : Devices record the analog “audio input devices sound and convert it into digital form for further processing.” Some Audio input devices are : Voice recognition microphone Musical Instrument Digital
  • 10. Video Input Definition : “ video input devices that can be used to entering full motion recording into a computer .“ Some video input devices are digital camera video capture
  • 11. Output Devices Definition “output devices can be used to receive information from the computer “ The output can be in two forms: Soft copy Hard copy
  • 12. Monitor Definition “a monitor is a peripheral device which displays computer output on a screen . Screen output is referred to as soft copy”  Features  Resolution-pixels  Dot pitch  Refresh rat  Size  Types of monitors Cathode Ray Tube (CRT)  Liquid crystal Display (LCD) 
  • 13. Printer Definition “a printer is a peripheral device that produces a physical copy or hard copy of the computer’s output.” Types of Printer : Impact Printers • Dot Matrix Printer • Daisy Wheel Printer Non Impact Printers • Laser Printer • Ink-Jet Printer • Thermal Printer
  • 14. Plotter Definition “a plotter is an output device that is used to produce high quality graphics in a variety of colors.” Types of Plotter  Flatbed Plotter  Drum plotter
  • 15. Audio output Devices Definition “audio output devices can be used to translates audio information from the computer into sounds that people can understand.”  Common audio output devices  Speakers  Headphones
  • 16. Projector Definition “projector can be used to displays computer information on big screen so that many will able to see the show.”
  • 17. Computer Output Microfilm (COM)  This technology is used to record computer output as a microscopic film images.  Information is recorded on a roll of film.  COM devices are used applications where there are large volumes of data.
  • 18. Combination Input and Output Devices Many devices combine input and output capabilities  Fax machines  Multifunction devices  Internet telephones Telephony  and Voice-over IP (VoIP)  known as  Terminals
  • 19. Fax machines Definition : “a fax machine refers to a device or equipment that does telephonic transmission of scanned material. It scans the original document and converts it into a bitmap. It then uses electronic signals to send the document to another recipient. “
  • 20. Terminals  An input and output device  Connects to a mainframe or server  Types of terminals  Dumb terminal  Intelligent terminal  Network terminal  Internet terminal