The quality of a transmitted useful signal can be stated with the signal-to-noise ratio. Noise arises with any data transmission. The higher the separation between Noise and useful signal, the more stable can the transmitted information be reconstructed from the signal. If, during the digital sampling, the Noise power and the useful signal power come too close, an incorrect value may be detected and the information corrupted. The SNR is calculated by dividing the Mean useful power by the Mean Noise power.