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Data Representation (Decimal, Binary & Hex (Decimal (Base-10 number…

- - - - 10 = 2
      - 1111 = 15
      - 10010001 = 145
- - - - With this table, the word "SEAL" would be:
        11 00 1000 01
  - - - Some data is permanently deleted
      - Recreates the file using the remaining data and algorithms to guess removed content.
      - When data is uncompressed, it is not the same as the original
      - When images are compressed, the file size is much smaller, but the quality is also reduced.
    - - Finds groups of repeating data and records it along with the number of times it occurs. This is known as Run Length Encoding (RLE)
- - - - BMP
      - JPG
      - GIF
      - PNG
      - TIF
    - - A pixel is the smallest
        identifiable area of an image.
      - Each pixel is a single colour and has
        a binary value which represents that colour.
  - - - Analogue sounds are continuous
      - Digital sounds are discrete
      - Analogue and Digital converters
        
        Converters are devices which convert digital and analogue sounds, processed by a computer.
        
        A microphone is an Analogue to Digital converter
        
        A speaker is a Digital to Analogue converter
    - - When sound is recorded, it is sampled
      - When a sound is recorded, it's frequency is sampled several times very quickly.
      - The number of samples per second it measured in Hz
      - The more bits used per sample, the more accurate the measurement, but the greater the file size.
      - File size (bits = sample rate x resolution x seconds)
      - The amplitude used to record each measurement is known as the sample resolution.