fidelity

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fidelity

Electronics the degree to which the output of a system, such as an amplifier or radio, accurately reproduces the characteristics of the input signal
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

fidelity

[fə′del·əd·ē]
(communications)
The degree to which a system accurately reproduces at its output the essential characteristics of the signal impressed on its input.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.