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Aliasing / Folding over

Top 2 plots (blue): sinusoid has (infinite) aliases, but its frequency does not exceed $ f_s/2$--GREAT!

\scalebox{0.8}{\includegraphics{eps/aliasfoldover}}

Bottom 2 plots (red): sinusoid with frequency $ > f_s/2$ will have a negative frequency component with an alias in the sounding bandwidth (shaded).

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``Music 171: Fundamentals of Digital Audio'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).
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Copyright © 2019-10-15 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>