| signal-to-noise ratio [`sig·nǝl tǝ `nȯiz ´rā·shō] ELECTRONICS The ratio of the amplitude of a desired signal at any point to the amplitude of noise signals at that same point; often expressed in decibels; the peak value is usually used for pulse noise, while the root-mean-square (rms) value is used for random noise. Abbreviated S/N; SNR. |