Spectral plot for a time-domain waveform displays the Fourier series coefficients graphically
against frequency. Since the frequencies involved in a Fourier series are discrete values
(fundamental frequency and its multiples), a plot of Fourier series coefficients cannot be a
continuous curve. Therefore, the spectral plot is called a discrete spectrum. The exponential
Fourier series coefficients are complex in general and two plots will be needed – one for
magnitude of the coefficients and the other for phase angle of the coefficients.
The information on coefficients is portrayed as a series of vertical lines ...
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