Transforms
- dct — Discrete cosine transform.
- dst — Discrete sine transform.
- fft — Direct or inverse Fast Fourier Transform of a vector, matrix, or hypermatrix
- 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 of fftshift
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