Lagrange Interpolation Coefficient Symmetry
As shown in [502, §3.3.3], directly substituting into
Eq.
(4.7) derives the following coefficient symmetry
property for the interpolation coefficients (impulse response) of a
Lagrange fractional delay filter:
where
is the order of the interpolator. Thus, the interpolation
coefficients for delay 
are the ``flip'' (time reverse) of
the coefficients for delay 
.
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Matlab Code for Lagrange Interpolation
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Explicit Lagrange Coefficient Formulas
