By far the best proof is experience.  

Sir Francis Bacon (1561 - 1626)

Signal-to-noise separation

Signal-to-noise separation specifies the quality of a signal with regard to its reproduction of intensities. The value signifies how high the ratio of noise is in regard to the maximum wanted signal intensity expected. The higher this value, the better the signal quality. The unit of measurement used is generally known as the decibel (dB), a logarithmic power level. 6 dB is the signal level at approximately a factor of 2.
However, the advantages of increasing signal quality are accompanied by a reduction in resolution. 

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