Odd-Order Lagrange Interpolation Summary
In contrast to even-order Lagrange interpolation, the odd-order case has the following properties (in fractional delay filtering applications):
- Improved phase-delay accuracy at the expense of decreased
amplitude-response accuracy (low-order examples in
Fig.
)
- Optimal (centered) delay range lies between two integers

To avoid a discontinuous phase-delay jump at high frequencies when crossing the middle delay, the delay range can be shifted to

Next Section:
Proof of Maximum Flatness at DC
Previous Section:
Even-Order Lagrange Interpolation Summary