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Table of Contents > Health Dictionary > Noise

Noise

1. Unwanted sound, particularly a complex sound that lacks a musical quality because its various frequencies that comprise it are not whole-or-partial number multiples (harmonics) of each other. 2. Unwanted additions to a signal not arising at its source; the 60-cycle frequency wave in an electrocardiogram; largely eliminated from machines after 1980 (includes visual noise on imaging studies). 3. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data.
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