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The structure of all-pass matrices that satisfy directional interpolation requirements

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2 Author(s)
Auba, T. ; Dept. of Mech. Eng., Nagoya Inst. of Technol., Japan ; Funahashi, Y.

All-pass matrices are considered which are permitted to have right-half plane (RHP) poles less than some specified number. This is an extension of the inner interpolation problem where no RHP poles are permitted. All-pass matrices which satisfy the directional interpolation requirements are obtained in closed form. The simple derivation provides an insight into the mechanism by which the interpolation requirements impose the ∞-norm restriction under the number condition of half plane poles

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Automatic Control, IEEE Transactions on  (Volume:36 ,  Issue: 12 )