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NDTFourierTransform
gives a numerical approximation to the discrete time Fourier transform of expr evaluated at the numerical value 
, where expr is a function of n.
更多信息
- To use
, you first need to load the Fourier Series Package using Needs["FourierSeries`"]. - The numerical approximation to the discrete time Fourier transform of expr is by default defined to be NSum[expr
-
n, {n, -∞, ∞}]. - Different choices for the definition of the discrete time Fourier transform can be specified using the option FourierParameters.
- With the setting FourierParameters->{a, b}, the discrete time Fourier transform computed by
is 
NSum[expr -bn, {n, -∞, ∞}]. - The parameter b in the setting FourierParameters->{a, b} must be numeric.
- In addition to the option FourierParameters,
can also accept the options available to NSum. These options are passed directly to NSum.
