{"term":{"id":"08282","title":"signal-to-noise ratio","longtitle":"IUPAC Gold Book - signal-to-noise ratio","doi":"10.1351\/goldbook.08282","code":"08282","status":"current","initialism":"<em>initialisms<\/em>: $\\rm{SNR}_{\\rm{dB}}$, S\/N, SNR","definitions":[{"id":1,"text":"Power of signal divided by power of noise.","notes":{"1":"When signal and noise are measured across the same impedance, SNR is often calculated as the root-mean-squared amplitude of the signal divided by the root-mean-squared amplitude of the noise.","2":"The value of signal-to-noise ratio may be expressed in decibel (\\(\\rm{SNR}_{\\rm{dB}}\\)) as ten times the logarithm to base 10 of signal-to-noise ratio.","3":"Initialisms should not be used to denote a quantity in expressions and formulae. \\(R_{\\rm{S\/N}}\\) is recommended."},"sources":["PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 672 (https:\/\/doi.org\/10.1515\/pac-2019-0203)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08282\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08282\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08282\/plain"},"citation":"Citation: 'signal-to-noise ratio' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351\/goldbook.08282","license":"The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/) for individual terms.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2026-06-21T03:58:41+00:00"}}