inverse fast Fourier transform
Mathematics term for the algorithm that converts frequency-domain data back to the time domain.
Use the inverse fast Fourier transform to convert the signal back to the time domain.
The forward transform (FFT), while 逆高速フーリエ変換 is its inverse (IFFT).
Compound of 逆 (inverse), 高速 (high-speed), and フーリエ変換 (Fourier transform), a direct translation of the English term.