 ##  [Signal-to-Noise Ratio](/signal-noise-ratio) 

  ##  [Signal-to-Noise Ratio](https://natural.quantumdictionary.io/signal-noise-ratio-0) 

  
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**Natural &amp; Formal Sciences Dictionary**

 
Definition

The ratio of a signal's measurable power (or variance) to the power (or variance) of background noise, expressed as a linear ratio or in decibels; quantifies detectability and fidelity of a measured quantity.

 
 ##  [Signal-to-Noise Ratio](https://engineering.quantumdictionary.io/signal-noise-ratio-1) 

  
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**Engineering &amp; Applied Technologies Dictionary**

 
Definition

Signal‑to‑Noise Ratio (SNR) is the ratio of desired signal power to background noise power measured over a specified bandwidth and at a specified reference point; commonly expressed in decibels as SNR(dB)=10·log10(Psignal/Pnoise).