A graphical technique for the determination of the range of a multiplier in a stable 2-D variable magnitude filter

A graphical technique is described, which permits one to obtain the limits of a coefficient of a multiplier in a 2-D stable transfer function having variable magnitude characteristics. It is shown that this method obviates the necessity of evaluating the various determinants and inequalities required for the same purpose, if the method of inners is employed. A computer program is developed to plot such graphs.