- The term ``biquad'' is short for ``bi-quadratic'', and is a common
name for a two-pole, two-zero digital filter. The transfer function of
the biquad can be defined as
- When the coefficients and are real (as we typically
assume), the poles must be either
- real (when
)
- form a complex conjugate pair (when
).
- When the poles form a complex pair, we may express them in polar form
as
is the pole radius, or distance from the origin in the -plane.
``Mus 270a: Introduction to Digital Filters''
by Tamara Smyth,
Department of Music, University of California, San Diego.
Download PDF version (filters.pdf)
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Download PDF `4 up' version (filters_4up.pdf)
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Copyright © 2019-02-25 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>