Nyquist theorem

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Ny·quist the·o·rem

(nī'kvist thē'ŏ-rĕm)
That a frequency must be sampled at least twice to reproduce it reliably.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
For Nyquist theorem N samples are necessary to exactly reconstruct the power spectrum density.
As you can see, sampling at 2 kHz accurately represents the frequency component according to the Nyquist Theorem, but sampling at 10 kHz better represents the shape of the original signal.