[Numpy-discussion] "Nyquist frequency" in numpy.fft docstring
Sun Jul 11 18:13:44 CDT 2010
Hi! I'm a little confused: in the docstring for numpy.fft we find the
"For an even number of input points, A[n/2] represents both positive and
negative Nyquist frequency..."
but according to http://en.wikipedia.org/wiki/Nyquist_frequency (I know, I
know, I've bad mouthed Wikipedia in the past, but that's in a different
"The *Nyquist frequency*...is half the sampling
signal <http://en.wikipedia.org/wiki/Discrete_signal> processing
system...The Nyquist frequency should not be confused with the
*, which is the lower bound of the sampling frequency that satisfies the
Nyquist sampling criterion for a given signal or family of signals...*Nyquist
rate*, as commonly used with respect to sampling, is a property of a
signal <http://en.wikipedia.org/wiki/Continuous-time_signal>, not of a
system, whereas *Nyquist frequency* is a property of a discrete-time system,
not of a signal."
Yet earlier in numpy.fft's docstring we find:
"...the discretized input to the transform is customarily referred to as a *
Should we be using "Nyquist rate" instead of "Nyquist frequency," and if
not, why not?
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