https://www.dsprelated.com/freebooks/mdft/Discrete_Time_Fourier_Transform.html
Discrete Time Fourier Transform (DTFT) | Mathematics of the DFT
Discrete Time Fourier Transform (DTFT) The Discrete Time Fourier Transform (DTFT) can be viewed as the limiting form of the DFT when its length is...
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https://scholars.duke.edu/publication/1386357
Scholars@Duke publication: Performance of a fast analog VLSI implementation of the DFT
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