A note on evaluation of the quantization error in denominator-separable 2-D recursive filters

It is shown that the results in Rahuramireddy and Unbehauen (1991) are not necessarily valid for a separable-in-denominator 2D digital filter with complex poles in both z/sub 1/ and z/sub 2/ independent variables. Modified equations, as well as relevant results on quantization errors evaluations are provided. >