discrete Fourier transform; DFT
Mathematical transform used to analyze discrete-time signals in the frequency domain.
The discrete Fourier transform is fundamental to digital signal processing.
Fast Fourier transform (FFT), an efficient algorithm to compute the DFT.
Continuous Fourier transform; DFT is its discrete counterpart.
From 離散 (discrete) + フーリエ (Fourier) + 変換 (transform). A direct calque of the English term.