Nyquist's theorem

Nyquist's theorem

[′nī‚kwists ‚thir·əm]
(electronics)
The mean square noise voltage across a resistance in thermal equilibrium is four times the product of the resistance, Boltzmann's constant, the absolute temperature, and the frequency range within which the voltage is measured.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Specifically, Nyquist's Theorem tells us a digital sampling system must capture more than two samples per cycle in order for the instrument to be able to reconstruct the proper signal frequency.