Decibels
The ratio between two values expressed on a
logarithmic scale,
e.g. to the base-10y = log10x or x = 10y.
Nbel = log(P1/P2) y NdB = 10 log(P1/P2)
e.g. 10 log(10-1) = -10 dB 10 log(100) = 0 dB 10 log(101) = 10 dB
x
24
10 log(102) = 20 dB
Note: Natural log, ln = loge where e = 2.718281...