Polynomials in the Delay

A more parametric approach is to formulate each filter coefficient as a polynomial in the desired delay :

Taking the z transform of this expression leads to the interesting and useful Farrow structure for variable FIR filters [134].

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About the Author: Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.