A new design approach for recursive diamond-shaped filters
Radu P. Matei · International Conference on Mathematical and Computational Methods in Science and Engineering · 2009
This paper proposes a new design method for two-dimensional diamond-shaped IIR filters. The design starts from a desired 1D prototype filter, to which a frequency transformation is applied, which leads to the 2D filter with desired shape. The frequency transformation is derived by specifying the filter shape in polar coordinates in the frequency plane. The designed filters also have the useful zero-phase property. Key-Words: Two-dimensional filter design, approximation theory, complex frequency transformations