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interference-to-noise ratioThe ratio of interference in a circuit or line to the noise. A signal-to-noise ratio (SNR) deals with noise that comes from the inherent qualities of the electronic components or the atmosphere and is mostly a static measurement. In contrast, interference-to-noise ratio (INR) is more of a dynamic measurement, typically used to measure a particular disturbance present at a given moment. See signal-to-noise ratio.
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impact noise rating (INR)
A rating, expressed by a single number, which is a rough measure of the effectiveness of a floor construction in providing isolation against the noise of impacts; in general, the higher the number, the greater the effectiveness.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.