La2 Data Measurement

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La2 Data Measurement

  1. 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. 2. Data measurement <ul><li>In mathematics, 1KB = 1000 bytes. </li></ul><ul><li>In computer, </li></ul><ul><li>KILOBYTE (KB) –: 1 KB = 2 ¹º bytes </li></ul><ul><li>1 KB = 1024 bytes or </li></ul><ul><li>MEGABYTE (MB) -: 1 MB = 2²º bytes </li></ul><ul><li>1MB = 1 048 576 bytes </li></ul><ul><li>GIGABYTE (GB) -: 1 GB = 2³º bytes </li></ul><ul><li>1GB = 1 073 741 824 bytes </li></ul><ul><li>TERABYTE (TB) -: 1 TB = 2 º bytes </li></ul><ul><li>1TB = 1 099 511 627776 bytes </li></ul>
  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 .
  4. 5. Clock Speed Measurement <ul><li>HERTZ AND SECONDS </li></ul><ul><li>1 hertz = 1 cycle </li></ul><ul><li> 1 second </li></ul><ul><li>MEGAHERTZ (MHz) -million </li></ul><ul><li>1 MHz = 1 000 000 cycles </li></ul><ul><li> 1 second </li></ul><ul><li>GIGAHERTZ (GHz) -billion </li></ul><ul><li>1 GHz = 1 000 000 000 cycles </li></ul><ul><li> 1 second </li></ul><ul><li>1 GHz = 1 000 MHz </li></ul>
  5. 6. <ul><li>example </li></ul>
  6. 7. INPUT <ul><li>A) There are four types of input: </li></ul><ul><li>Text </li></ul><ul><li>Graphic </li></ul><ul><li>Audio </li></ul><ul><li>Video </li></ul><ul><li>B) Please give at least 2 example for : </li></ul><ul><li>Input device for texts – keyboard, stylus, optical reader, bar code reader, data glove </li></ul><ul><li>Input device for graphic – scanner, digital camera, drawing tablet, </li></ul><ul><li>Input device for audio – microphone, MIDI keyboard, speech recognition, </li></ul><ul><li>Input device for video – videocam, image scanner, 3d scanner, cctv, digital video camera, </li></ul><ul><li>C) OUTPUT DEVICE - </li></ul><ul><li>D) i) what is peripheral device? – is any device attached to a computer in order to expands its functionality. </li></ul><ul><li>ii) Give example for peripheral device –printers,scanners,disk drives,tape drives,microphone,speakers and cameras. </li></ul>
  7. 8. <ul><li>B) Please give at least 2 example for : </li></ul><ul><li>Input device for texts – keyboard, stylus, optical reader, bar code reader, data glove </li></ul><ul><li>Input device for graphic – scanner, digital camera, drawing tablet, </li></ul><ul><li>Input device for audio – microphone, MIDI keyboard, speech recognition, </li></ul><ul><li>Input device for video – videocam, image scanner, 3d scanner, cctv, digital video camera, </li></ul>
  8. 9. <ul><li>B) Please give at least 2 example for : </li></ul><ul><li>output device for texts – </li></ul><ul><li>output device for graphic – </li></ul><ul><li>output device for audio – </li></ul><ul><li>output device for video – </li></ul>
  9. 10. Input device for text <ul><li>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. </li></ul>
  10. 11. Input device for audio <ul><li>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. </li></ul><ul><li>Speech recognition applications that have emerged over the last few years include voice dialing ( e.g. , &quot;Call home&quot;), call routing ( e.g. , &quot;I would like to make a collect call&quot;), 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). </li></ul><ul><li>Voice recognition or speaker recognition is a related process that attempts to identify the person speaking, as opposed to what is being said. </li></ul><ul><li>[ </li></ul>
  11. 12. PERIPHERAL DEVICE <ul><li>C) i) what is peripheral device? – is any device attached to a computer in order to expands its functionality. </li></ul><ul><li>ii) Give example for peripheral device –printers, scanners,disk drives, tape drives, microphone, speakers and cameras. </li></ul>

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