Dictionary:Signal-to-noise ratio (S/N)

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The energy (or sometimes amplitude) of the signal divided by all remaining energy (noise) at the time. Sometimes the denominator is the total energy, that is, S/(S+N). Signal-to-noise ratio is difficult to determine in practice because of the difficulty in separating out the signal (the desired portion). Sometimes S2 is measured by a cross-correlation and (S+N)2 by an autocorrelation.