Generation of two-dimensional digital functions without nonessential singularities of the second kind
P.K. Rajan, H.C. Reddy, M.N.S. Swamy, V. Ramachandran · IEEE Transactions on Acoustics Speech and Signal Processing · 1980
A class of two-variable Hurwitz polynomials called very strict Hurwitz polynomials (VSHP's) is defined and its properties are studied. Their application in the generation of two-variable functions without nonessential singularities of the second kind is indicated. Necessary and sufficient conditions on general and reactance one-variable to two-variable transformations so that they yield two-variable transfer functions without singularities of the second kind are obtained.