Approximation design of 2-D digital filters with elliptical magnitude response of arbitrary orientation
D. Nguyen, M.N.S. Swamy · IEEE Transactions on Circuits and Systems · 1986
This paper presents an approximation technique which resuits in simple formulas for fast calculation of the McClellan transform coefficients, and should be useful for real-time and adaptive 2-D digital filtering. The coefficients are calculated by fitting the power series expansion of the transform to the analytical description of the iso-potential contours of the filter. Formulas are also derived for the coefficients of the scaling-free transform, recently proposed by the authors.