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Increasing the phase delay

Again returning to the simple low pass filter... What happens when the delay is increased?

\scalebox{0.55}{\includegraphics{eps/ffcombfreq}}

Notice appearance of regularly spaced peaks/notches (like teeth of a ``comb'').

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``Music 206: Delay and Digital Filters I'' by Tamara Smyth, Computing Science, Simon Fraser University.
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Copyright © 2020-01-14 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>