Sinusoidal multiplication can therefore be expressed as addition
Figure 4:
Beat note waveform and spectrum from
adding sinusoids at 218 Hz and 222 Hz.
![\scalebox{0.8}{\includegraphics{eps/beatA.eps}}](img16.png) |
Spectral frequencies
are not those of the multiplied sinusoids (2 and 220 Hz),
but their
- sum: 220 + 2 = 222 Hz and
- difference: 220 - 2 = 118 Hz.
``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>