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Summing Sinusoids Close in Frequency

What happens when we two sinusoids having frequencies that are not harmonically related?

Consider the sum of two sinusoids close in frequency:

Figure 1: Sinusoids at 18 and 22 Hz.
\scalebox{0.8}{\includegraphics{eps/sumsinB.eps}}

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``Music 171: Amplitude Modulation'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).
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Copyright © 2019-11-05 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>