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La2 Data Measurement

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  • 1. DATA MEASUREMENT Learning Outcomes: At the end of the lesson you should be able to describe the units of data measurements such as Kilobyte, Megabyte, Gigabyte, Terabyte Prepared by : Norhasimah Mohamed – Head of Information & Communication Technology Panel, SMK Sungai Pusu, Gombak 2007
  • 2. Data measurement
    • In mathematics, 1KB = 1000 bytes.
    • In computer,
    • KILOBYTE (KB) –: 1 KB = 2 ¹º bytes
    • 1 KB = 1024 bytes or
    • MEGABYTE (MB) -: 1 MB = 2²º bytes
    • 1MB = 1 048 576 bytes
    • GIGABYTE (GB) -: 1 GB = 2³º bytes
    • 1GB = 1 073 741 824 bytes
    • TERABYTE (TB) -: 1 TB = 2 º bytes
    • 1TB = 1 099 511 627776 bytes
  • 3.  
  • 4. CLOCK SPEED MEASUREMENT Learning Outcomes: At the end of the lesson you should be able to describe the units of clock speed measurement .
  • 5. Clock Speed Measurement
    • HERTZ AND SECONDS
    • 1 hertz = 1 cycle
    • 1 second
    • MEGAHERTZ (MHz) -million
    • 1 MHz = 1 000 000 cycles
    • 1 second
    • GIGAHERTZ (GHz) -billion
    • 1 GHz = 1 000 000 000 cycles
    • 1 second
    • 1 GHz = 1 000 MHz
  • 6.
    • example
  • 7. INPUT
    • A) There are four types of input:
    • Text
    • Graphic
    • Audio
    • Video
    • B) Please give at least 2 example for :
    • Input device for texts – keyboard, stylus, optical reader, bar code reader, data glove
    • Input device for graphic – scanner, digital camera, drawing tablet,
    • Input device for audio – microphone, MIDI keyboard, speech recognition,
    • Input device for video – videocam, image scanner, 3d scanner, cctv, digital video camera,
    • C) OUTPUT DEVICE -
    • D) i) what is peripheral device? – is any device attached to a computer in order to expands its functionality.
    • ii) Give example for peripheral device –printers,scanners,disk drives,tape drives,microphone,speakers and cameras.
  • 8.
    • B) Please give at least 2 example for :
    • Input device for texts – keyboard, stylus, optical reader, bar code reader, data glove
    • Input device for graphic – scanner, digital camera, drawing tablet,
    • Input device for audio – microphone, MIDI keyboard, speech recognition,
    • Input device for video – videocam, image scanner, 3d scanner, cctv, digital video camera,
  • 9.
    • B) Please give at least 2 example for :
    • output device for texts –
    • output device for graphic –
    • output device for audio –
    • output device for video –
  • 10. Input device for text
    • Data glove -These devices are used with one or both hands to enter text either by measuring accelerations/rotations of the forearm and flexations of the fingers (gesture recognition) or in a more traditional way by working as a keyboard, whose buttons are attached to the glove - or combinations of these.
  • 11. Input device for audio
    • Speech recognition - Speech recognition (in many contexts also known as automatic speech recognition , computer speech recognition or erroneously as voice recognition ) is the process of converting a speech signal to a sequence of words, by means of an algorithm implemented as a computer program.
    • Speech recognition applications that have emerged over the last few years include voice dialing ( e.g. , "Call home"), call routing ( e.g. , "I would like to make a collect call"), simple data entry ( e.g. , entering a credit card number), preparation of structured documents (e.g., a radiology report), domotic appliances control and content-based spoken audio search ( e.g. find a podcast where particular words were spoken).
    • Voice recognition or speaker recognition is a related process that attempts to identify the person speaking, as opposed to what is being said.
    • [
  • 12. PERIPHERAL DEVICE
    • C) i) what is peripheral device? – is any device attached to a computer in order to expands its functionality.
    • ii) Give example for peripheral device –printers, scanners,disk drives, tape drives, microphone, speakers and cameras.