Computer science Exam 2

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Computer science Exam 2
2012-02-01 20:40:10

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  1. Input
    any data or instructions that are used by a computer
  2. Input devices
    hardware used to translate words, sounds, images, and actions that people understand into a form that the system unit can process
  3. optical mouse
    no moving parts
  4. trackball (roller ball)
    control the pointer by rotating a ball with your thumb
  5. multitouch screens
    • touch by more than one finger
    • rotate graphical objects with your hand
    • zoom in and out by pinching and stretching your fingers
  6. scanning devices
    • convert scanned text and images into a form that the system unit can process
    • optical scanners
    • card readers
    • bar code readers
    • character and mark recognition devices
  7. optical scanners
    • accepts documents consisting of text and/or images and convert them to machine-readable forms
    • flat-bed scanner
  8. card reader
    interprets encoded info stored on cards, credit cards, debit cards
  9. magnetic card reader
    thin magnetic strips on the back of the card
  10. radio frequency card readers
    RFID (radio frequency identification) microchip contains the user's encoded info
  11. magnetic-ink character recognition
    banks used to automatically read the unusual numbers on the bottom of checks and deposti slips
  12. optical-mark recognition (OMR)
    • sense pencil marks
    • score standardized multiple choice tests
  13. audio input devices
    • convert sounds into a form that can be processed by the system unit
    • microphone
  14. voice recognition systems
    • use microphone, sound card, and special software
    • use voice commands
  15. Clarity
    most important characteristic of a monitor
  16. resolution
    the higher the resolution (the more dots, pixels) the clearer the image
  17. Dot (pixel) pitch
    • the distance between each pixel
    • lower the pitch the clearer the images
  18. active matrix
    thin film transistor (TFT)
    • each pixel is independently activated
    • better clarity
    • more expensive
    • require more power
  19. cathode-ray tubes (CRT)
    • similar in size and technology to televisions
    • low cost and excellent resolutions
    • bulky and less energy efficient
  20. printer resolution
    dpi (dots per inch)
  21. printer speed
    measure by number of pages per minute
  22. printer memory
    used to store printing instructions and documents waiting to be printed
  23. ink jet printer
    • spray ink at high speed onto the surface of paper
    • most widely used
  24. laser printer
    use laser light beam to produce image with excellent letter and graphics quality
  25. personal laser printer
    • less expensive
    • used by single users
    • prints 15-17 pages/min
  26. shared laser printers
    • used by a group of users
    • 50 pages/min
  27. digital music players
    devices ofr storing, transferring, and playing audio files
  28. Voice over (VOIP)
    • also known as telephony
    • transmission of telephone calls over computer networks