Representing Data

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  • Created by: MikeZara
  • Created on: 08-04-16 19:48
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  • Representing Data
    • Binary
      • Numbers in a computer are represented in binary
      • Binary is Base 2, so it only uses 2 digits (0 and 1)
      • Adding Binary
        • 0 + 0 = 0
        • 0 + 1 = 1
        • 1 + 1 = 0 Carry 1
        • 1 + 1 + Carried 1 = 1 Carry 1
        • An overflow error occurs when the result of a binary calculation is larger than the allocated memory
      • 128|64|32|16|8|4|2|1
    • Hex
      • Hex is Base 16
      • After counting 0-9 normally, hex then goes A-F instead of 10-15
    • Sound
      • Hz/Sample Rate = the amount of samples from the analogue wave taken a second
      • Higher sample/ bit  rate = higher quality BUT larger file size
      • Bit rate = the number of memory bits used to store each sound sample
      • Lossy Compression = Worse quality, smaller file
        • Used when there is not much repeated data. Removes unnecessary data (e.g. sounds most listeners couldn't hear)
      • Lossless Compression = Original quality, larger file
        • Stores identical data only once, and indexes how many times it appears
    • Characters
      • ASCII (American Standard Code for Information Interchange)
        • 8-bits per character, 128 Characters (256 possible), English only
      • Unicode
        • 16 bits per character, 65536 characters
      • Computers give each character a unique binary code, a Code Point
      • Character Set = a particular range of characters
        • Example = Latin1: all the English characters (123, abc, ABC)

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