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  DFT (Discrete Fourier Transform) Information DFT (Discrete Fourier Transform) is a mathematical technique used for frequency analysis of a finite set of discrete data. DFT is a transformation of a discrete signal from the time domain to the frequency domain. It decomposes a signal into a sum of sinusoids of different frequencies. DFT is widely used in digital signal processing, image processing, and data compression. DFT is com.. Zettelkasten/Terminology Information 2023. 2. 19.