Data Representation (Binary)

  • Created by: Epic Al
  • Created on: 21-06-22 19:10
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  • Data representation
    • ASCII
      • American standard code for international interchange
      • 7 bit code (128 code sequences)
      • A character set is the list of binary codes that can be recognised by a computer
    • Bitmap images
      • A digital image is made up of small points of colour called pixels
      • Modern characters produce images with a colour depth of 24 bits
      • 24 bit image is 16777216 colours
      • resolution is number of pixels per inch when displayed
      • image file size = width x height x colour depth (usually 1024 x 1024)
    • Analogue sound
      • Samples of a sound wave are taken at regular intervals
        • this is called the sample interval
          • number of samples over a given time period is a sample rate
      • audio file size (bits) = sample rate x bit depth x recording length (seconds)
      • CD's have a sample rate of 44.1 kHz
    • Limiting factors
      • Number of values
        • number of different binary patterns
      • unsigned and signed intagers
      • Characters
        • To represent other alphabets such as kanji and Cyrillic more bits are required
      • Bitmap images
        • increasing the colour depth increases file size
        • number of bits
      • Sounds
        • number of bits


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