To apply an envelope on a signal, the envelope is
multiplied by the signal.
The results then suggest that adding two sinusoids close in frequency is the
same as multiplying two sinusoids, in this case, one low-frequency.
This can be shown mathematically to be true!
Cosine Product formula,
we can show that
``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>