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Stable reduced-order models for discrete-time systems

Stable reduced-order models for discrete-time systems

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The Routh-stability method is employed to reduce the order of discrete-time system transfer functions. It is shown that the Routh approximant is well suited to reduce both the denominator and the numerator polynomials, although alternative methods, such as Padé-Markov approximation, are also used to fit the model numerator coefficients.

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