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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
discrete Fourier transform
DFT
(DFT) A Fourier transform, specialized to the
case where the abscissas are integers.
The DFT is central to many kinds of signal processing,
including the analysis and compression of video and sound
information.
A common implementation of the DFT is the {Fast Fourier
Transform} (FFT).
See also discrete cosine transform.
(1997-03-10)