Counterexample in the least-squares inverse stabilisation of 2D recursive filters
- 24 July 1975
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 11 (15) , 330-331
- https://doi.org/10.1049/el:19750252
Abstract
A counterexample is presented disproving the conjecture that the planar least-squares inverse of a 2-variable polynomial is devoid of zeros when both variables are inside or on the unit circle.Keywords
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