Eq. (3.123). The f(t) function defined by Eq. (3.124) is denoted as the inverse
Fourier transform or Fourier integral approximation of f(t). Equations (3.123) and
(3.124) are known as the Fourier transform pairs.
Fig. 3.4 Representation of phase shifts (after Chapra and Canale 1989)
Fig. 3.5 Spectral lines for a amplitude and b phase (after Chapra and Canale 1989)
3.6 Spectral Analysis
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