To use InverseDTFourierTransform, you first need to load the Fourier Series Package using Needs["FourierSeries`"].
The inverse discrete time Fourier transform of expr is by default defined to be .
If n is numeric, it should be an explicit integer.
Different choices for the definition of the inverse discrete time Fourier transform can be specified using the option FourierParameters.
With the setting FourierParameters->{a, b}, expr is assumed to have a period of , and the inverse discrete time Fourier transform computed by InverseDTFourierTransform is .
In addition to the option FourierParameters, InverseDTFourierTransform can also accept the options available to Integrate. These options are passed directly to Integrate.
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, and the inverse discrete time Fourier transform computed by InverseDTFourierTransform is 
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EXAMPLES
Basic Examples 
