Signal / Noise ratio

• measures the amount of thermal noise present

• usually expressed in decibels as

  S/N = 10 log (Signal Power/Noise Power)
  

• eg S/N ratio of

  10 log (10/1) = 10 db
  
  10 log(100/1) = 20 db
  10 log (1000/1) = 30 db

• a high S/N is good, low S/N is bad

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