Beat Spectrum

Sinusoidal multiplication can therefore be expressed as addition

**Figure 4:** Beat note waveform and spectrum from adding sinusoids at 218 Hz and 222 Hz.
$\scalebox{0.8}{\includegraphics{eps/beatA.eps}}$

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>