Nyquist Frequency
Half the sampling frequency. Any analog frequency component above the Nyquist frequency will, after sampling, be converted (aliased) to a frequency below the Nyquist frequency.
Example: the theoretical Nyquist frequency of an audio CD recording is 22.05 kHz
See also: Aliasing, Anti-Aliasing Filter, Sampling Theorem.
Subjects: Electronics Noise & Vibration