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- The Farrow structure computes
th-order Lagrange interpolation
using
multiplies and adds
- This is the same complexity as plain FIR filtering using the closed-form coefficient formulas above
- However, the Farrow structure is more convenient for
variable-delay applications because it is a linear combination of
fixed FIR filters
,
, with linear
combination coefficients given by
, computed recursively,
where
is the desired delay:
- The next section describes a formulation achieving complexity
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