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C2 - Signalling (Transmitting Signals (Time Taken to Transmit (No. of bits…

- - - - Can only have set values in order to be processed by computers
    - - Can have potentially any value as it's constantly changing
  - - - Resolution = Pixel Width x Pixel Height
  - - - Each pixel value is encoded with a No. of bits
        
        No. of Values Possible with x bits
        
        No. of bits needed to encode x data
        
        No. of Bits = No. of Pixels x Bits per Pixel
  - - - Even though signals transmitted have varying freq, the freq is modulated so only a given range can be used
        
        Bits per sec
- - - - Noise doesn't affect digital signals due to the value limit the signal can have
        
        Expand
        
        How many bits is used is how it is coded
        
        If 2 Bit coding is used, there are 2^2 possible values for the signal
        
        Resolution of the sample is the smallest change in p.d that can be determined
        
        Resolution = p.d change / No. of levels
- - - - Median Smoothing
        
        Edge Detection
        
        For each pixel value, multiply it by 4, subtract the NESW pixels
        
        If the result is -ve result becomes 0 leaving a crisp edge
      - Takes a median average of the pixels which efficiently removes noise