The value about which the impulse response is symmetric is the
phase delay of the filter.
Linear phase is desirable because it delays all frequencies
by the same number of samples and that means no phase distortion.
``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>