An (non-linear) Amplitude Envelope

Adding these two sinudoids produces a (seemingly) sinusoidal signal.

But constructive/destructive interference imposes a (nonlinear) amplitude envelope.

**Figure 2:** Sinusoids at 18 and 22 Hz.
$\scalebox{0.8}{\includegraphics{eps/sumsinC.eps}}$

``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>