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A more parametric approach is to formulate each filter coefficient
as a polynomial in the desired delay
:
![$\displaystyle h_\Delta(n) \isdefs \sum_{m=0}^{N_c}c_n(m)\Delta^m, \quad n=0,1,2,\ldots,N \protect$](img1075.png) |
(5.9) |
Taking the z transform of this expression leads to the interesting and useful
Farrow structure for variable FIR filters [135].
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