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H-infinity optimal causal IIR inverse filter for the cubic spline

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This computes the H-infinity optimal causal filter (indirect B-spline filter) for the cubic spline.

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Computes the H-infinity optimal causal filter (indirect B-spline filter) for the cubic spline.

[INPUT]
d: delay

[OUTPUT]
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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Filter design

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MATLAB 7.8 (R2009a)

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