Abstract
This paper considers certain useful approximations which can be obtained by doubly terminated two-variable cascade-separable networks. Since such networks can be transformed into 2-D wave digital filters, these approximations provide useful magnitude responses in the 2-D digital domain, also. Two approximation methods are discussed, and these can produce near quadrantal symmetry.
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Raman, B., Ramachandran, V. & Swamy, M.N.S. Approximation of 2-D analog and digital transfer functions using doubly terminated cascade-separable network properties. Circuits Systems and Signal Process 2, 445–467 (1983). https://doi.org/10.1007/BF01599164
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DOI: https://doi.org/10.1007/BF01599164