5.56 signal-to-noise ratio level. Ten times the logarithm to the base ten of signal-to-noise ratio. Symbol, NSN. Unit, decibel (dB).
Annotation 1 When measures proportional to signal power, S, and noise power, N, can be determined separately and independently, signal-to-noise ratio level is given by:
NSN = 10 lg(S/N) dB.
Annotation 2 When measures proportional to signal and noise power cannot be determined separately and independently, the level of the ratio of signal-plus-noise to noise, N’SN is given by:
N’SN = 10 lg[(S+N)/N] dB.« Back to Standards Terminolgy Index