Abstract
The correlation matching property of all-pole models does not extend readily to pole-zero models. It is proved that, if the number of poles in a pole-zero model is strictly less than the number of given correlations, a pole-zero model that matches the given correlations may not exist, irrespective of the number of zeros in the model. It is also shown that if one adds a set of cepstral constraints, a maximum-entropy pole-zero model that matches the correlation and cepstral constraints may not exist. It is concluded that pole-zero modeling minimizing some error criterion might be preferable to exact constraint matching.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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