It is shown that although S.D. Stearn's conjecture (1981) concerning sufficient conditions to guarantee unimodality of error surfaces is valid for first-order and second-order filters, it is not true in general without an additional constraint introduced by T. Soderstrom and P. Stoica (1982). Counterexamples are presented to illustrate the failure of Stearn's conjecture when Soderstrom's condition is not satisfied
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Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Date of Conference: 11-14 Apr 1988