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As shown in [506, §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:
![$\displaystyle h_\Delta(n) \eqsp h_{N-\Delta}(N-n), \quad n =0,1,\ldots,N, \protect$](img1039.png) |
(5.8) |
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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