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Response at the Cutoff Frequency

Look a little closer at the filter's response to $ f_s/4$.

Figure 3: Filter behaviour at $ f_s/4$.
\scalebox{.7}{\includegraphics{eps/phasedel.eps}}

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previous What about all the frequencies in between?
``Mus 270a: Introduction to Digital Filters'' by Tamara Smyth, Department of Music, University of California, San Diego.
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Copyright © 2019-02-25 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>