Definitions for "S/N Ratio"
Keywords:  decibels, noise, ratio, better, crisper
Maximum output of an electronic device or recording medium compared to its noise floor or level of background noise. S/N ratios are measured in decibels (dB), and larger numbers are better. A S/N ratio of 100 dB means that the maximum signal output is 100 decibels above the noise floor, or the point at which the signal will be obscured by noise (low-level hum and other electrical interference that is part of the component).
a measurement of the noise level in a signal expressed in dB (decibels). In a video signal, values from 45dB to 60dB produce an acceptable picture. Less than 40dB is likely to produce a 'noisy' picture.
Indicates the ratio of noise to actual total signal (in a video or audio signal generally speaking). The S/N number measures how much higher the signal level is to the level of background electronic noise, so a higher number means a clearer and crisper picture. Signal-to-noise ratio is expressed in decibels (dB).