Much like a physical prism, which displays the frequency components of a light wave, Fourier analysis can be thought of as a mathematical prism that can tell us what harmonics or frequency components are contained in a recording of a sound wave. We wrote the MacScope II program1 so that the user could not only see a plot of the harmonic amplitudes but also see the harmonic waves and how these waves add together to recreate the original sound curve.
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Elisha Huggins; Introduction to Fourier Optics. Phys. Teach. 1 September 2007; 45 (6): 364–368. https://doi.org/10.1119/1.2768695
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