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3 definitions found
 for signal-to-noise ratio
From WordNet (r) 3.0 (2006) :

  signal-to-noise ratio
      n 1: the ratio of signal intensity to noise intensity [syn:
           signal-to-noise ratio, signal-to-noise, signal/noise
           ratio, signal/noise, S/N]

From The Jargon File (version 4.4.7, 29 Dec 2003) :

  signal-to-noise ratio
   n.
  
      [from analog electronics] Used by hackers in a generalization of its
      technical meaning. ?Signal? refers to useful information conveyed by some
      communications medium, and ?noise? to anything else on that medium. Hence a
      low ratio implies that it is not worth paying attention to the medium in
      question. Figures for such metaphorical ratios are never given. The term is
      most often applied to Usenet newsgroups during flame wars. Compare {
      bandwidth. See also coefficient of X, lost in the noise.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  signal-to-noise ratio
  SNR
  S/N ratio
  
     1.  (SNR, "s/n ratio", "s:n ratio") "Signal"
     refers to useful information conveyed by some communications
     medium, and "noise" to anything else on that medium.  The
     ratio of these is usually expressed logarithmically, in
     decibels.
  
     2.  The term is often applied to Usenet
     newsgroups though figures are never given.  Here it is quite
     common to have more noise (inappropriate postings which
     contribute nothing) than signal (relevant, useful or
     interesting postings).  The signal gets lost in the noise
     when it becomes too much effort to try to find interesting
     articles among all the crud.  Posting "noise" is probably the
     worst breach of netiquette and is a waste of bandwidth.
  
     [{Jargon File]
  
     (1996-01-29)
  

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