Nyquist rate

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These terms refer to the nyquist sampling theorem, but are used in different ways by different authors. They can be used to mean four different things depending on author:

  • The highest frequency contained in a signal
  • Twice the highest frequency contained in a signal
  • the sampling rate
  • One-half the sampling rate.

Nyquist sampling theorem[edit]

Often called just sampling theorem or sometimes shannon sampling theorem

A continuous signal (analog signal) can be properly sampled, only if it does not contain frequency components above one-half of the sampling rate. This means that with cd-audio's 44.1kHz sampling rate, the maximum frequency that can be represented properly is 22.05kHz.