Abstract
Digital realization of a class of two-dimensional, zero-phase filters with variable cutoff boundary is given. The derivation of the 2-D transfer function is based on the transformation of a 1-D analog reference filter using a two-variable reactance function. Digital realization of the resulting 2-D transfer function is derived by using the generalized delay unit concept and cascade connections of two-port networks represented by their scattering matrices.
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