Signal-to-Noise Ratio (SNR)

The ratio of the magnitude of the wanted signal to that of the unwanted noise, expressed as a simple arithmetic ratio or in decibels. For example, the ratio between the input signal and the system noise of an amplifier. Also abbreviated S/N.

See: Background Noise, Digital Recording, Dynamic Range, Tape Recording. Compare: Gain, VU Meter.

A signal-to-noise ratio is said to be favorable when the signal predominates; that is, it can be clearly distinguished from the noise, and exceeds it by at least 60 dB. When signal and noise are less clearly distinguishable, the signal-to-noise ratio is said to be poor or low.

See: Acoustic Space, Hi-Fi, Lo-Fi. Compare: Cocktail Party Effect.