In signal processing, the Nyquist rate, named after Harry Nyquist, is two times the bandwidth of a bandlimited signal or a bandlimited channel. This term is used to mean two different things under two different circumstances:
- as a lower bound for the sample rate for alias-free signal sampling[1] (not to be confused with the Nyquist frequency, which is half the sampling rate of a discrete-time system) and
- as an upper bound for the symbol rate across a bandwidth-limited baseband channel such as a telegraph line[2] or passband channel such as a limited radio frequency band or a frequency division multiplex channel.
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