FREQUENCY GRID DENSITY FOR THE DESIGN OF 2-D FIR FILTERS

In the design of a digital 2-D FIR filter, the frequency response is o ften optimised to satisfy a given set of specifications on a dense gri d of frequency points. The accuracy of a filter design improves when t here are more grid points, but this is at the expense of higher comput ational resources. The authors present the relationship between the ac curacy and the frequency grid density in 2-D filter designs. A new for mula for determining the frequency grid spacing is also proposed.