Tranformées
- idct — Inverse discrete cosine transform.
- idst — Inverse discrete sine transform.
- ifft — Transformée de Fourier inverse discrète.
- fft2 — two-dimension fast Fourier transform
- fftshift — rearranges the fft output, moving the zero frequency to the center of the spectrum
- hilb — FIR approximation to a Hilbert transform filter
- ifftshift — inverse de fftshift
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