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In order for a band-limited (i.e., one with a zero Power Spectrum for frequencies ) baseband (
) signal to be
reconstructed fully, it must be sampled at a rate
. A signal sampled at
is said to be Nyquist
Sampled, and
is called the Nyquist Frequency. No information is lost if a signal is sampled
at the Nyquist Frequency, and no additional information is gained by sampling faster than this rate.
See also Aliasing, Nyquist Frequency, Nyquist Sampling, Oversampling