SNR is a measure to compare the level of a desired signal to the level of background noise. It is defined as:
$$ SNR = \frac{P_{\text{signal}}}{P_{\text{noise}}} $$
Where:
- \(P\) is the average power
It can also be expressed in decibels (dB):
$$ SNR_{dB} = 10 \log_{10} (SNR) $$