Computes the H-infinity optimal causal filter (indirect B-spline filter) for the cubic spline.
psi: the optimal filter psi(z) in a TF object
gopt: optimal value
This file is based on the following paper:
M. Nagahara and Y. Yamamoto,
H-infinity optimal approxmation for causal spline interpolation,
Signal Processing, Vol. 91, No. 2, pp. 176-184, 2011.
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