NFourierTransform — numerical approximation to Fourier transform
NInverseFourierTransform — numerical approximation to inverse Fourier transform
NFourierSinTransform — numerical approximation to Fourier sine transform
NFourierCosTransform — numerical approximation to Fourier cosine transform
FourierCoefficient — coefficient in a Fourier exponential series expansion
FourierSinCoefficient — coefficient in a Fourier sine series expansion
FourierCosCoefficient — coefficient in a Fourier cosine series expansion
FourierTrigSeries — Fourier trigonometric series expansion to a given order
DTFourierTransform — discrete time Fourier transform
InverseDTFourierTransform — inverse discrete time Fourier transform
