Data representation

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  • Data representation
    • Binary
      • Computers use the binary alpha to represent all data and instructions
      • Consists of two numbers, 1 and 0. Symbolise voltage, 0 being off and 1 being on
      • Could represent different types of data such as text, image, sound, integer, date and real number
      • The stages of converting sound to digital form
        • 1. computer cannot work with analogue data, so converted to digital data
        • 2. Microphone picks up sound waves
        • 3. Converted to an electrical analogue signal
        • 4. Value read at specific point and rounded to a level
        • 5. The points which sound is read and stored defines the sample rate. the higher the sample rate the better quality but the larger the sound file.
        • 6. Binary representation is stored
      • Stage of using binary to represent bitmap images
        • 1. Image represented as grid or sequence of pixels
        • 2. Each pixel is represented by one bit, white is represent by 0 and black is represent a 1
        • 3. White and black are represented by using different patterns
        • 4. Same bit pattern used for black and white
        • 5. Metadata about the image is also stored
    • ASCII- American Standard Code for Information Interchange
      • Characters are represented in binary using ASCII or other character conversion system
      • Has limitations, total number of characters that can be encded is 128 characters
      • Possible limitations for global communicatio-n
        • ASCII is 7 bit character set so can include 128 different characters
        • Characters of other languages or alphabets cannot be represented
          • These 128 characters represent mainly just the latin alphabet
            • ASCII is 7 bit character set so can include 128 different characters
    • Advantages of hexidecimal over binary
      • easier to read than binary
      • easier to convert to binary than denery
      • Numbers displayed in more compact way in hex
      • Quicker to type in hex numbers than binary numbers
      • Less memory is used to store hex than binary
      • Easier to remember as shorter

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