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Fig. 5A —Fourier transform (FT). Fourier transform of a complicated
signal g(t), which exists in time (t) or spatial domain,
gives an expression for frequency domain G(f). When plotted,
frequency domain displays individual frequencies and relative amplitudes of
simpler waves constituting g(t). Inverse Fourier transform (iFT) of
G(f) restores the time domain. No information is gained or lost in
mathematic transforms; they merely change the way we see the same
information.
