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




Less memory isn't used to store hex as memory can only work with binary and the hex represents binary so the same amount of memory would be used to store the hex... or at least that's what I thought?

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