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Laurent-Cauchy Transforms for Analysis of Linear Systems Described by Differential-Difference and Sum Equations

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2 Author(s)
Ku, Y.H. ; The Moore School of Electrical Engineering, University of Pennsylvania, Philadelphia. Dr. Ku is also a consultant to RCA, Camden, N.J. ; Wolf, A.A.

The Taylor-Cauchy transform for the analysis of nonlinear systems was presented at the 1959 IRE National Convention. In this paper it is shown that the Laurent-Cauchy transform can be derived from the Taylor-Cauchy transform by a simple mapping. Whereas a complex ¿ plane is used in the Taylor-Cauchy transform, a complex ¿ plane is used in the Laurent-Cauchy trans-form where the two complex variables are related by ¿= 1/¿. In the Taylor-Cauchy transform method, W(k)(¿), the kth derivative of W(¿), converges inside a circle. However, in the Laurent-Cauchy transform method, H(¿) converges outside of a circle of radius R. Thus, W(k)(¿) is expressible by a Taylor series whose general term is ¿ wn,k¿n and H(¿) is expressible by a Laurent series whose general term is ¿ hn ¿ -n. In either case, the relation between the coefficients of the power series and the function of a complex variable is given by Cauchy's integral. In conjunction with the Laplace transform, the Laurent-Cauchy transform can be used to analyze discrete-continuous systems such as digital servomechanisms, retarded feedback control systems, certain analog-digital computer systems, and pulsed-data systems. If n is replaced by n T, where T is a sampling time, and hn is taken to mean h(n T), the Laurent-Cauchy transform reduces to the Z-transform. A table of Laurent-Cauchy transforms, several theorems, and three examples are given in the paper.

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Proceedings of the IRE  (Volume:48 ,  Issue: 5 )