Design of Wavelet Filters Based on Digital Complex Allpass Filters
A. Fernandez-Vazquez, Gordana Jovanović Doleček · 2005
A method for designing IIR complex wavelet filters based on complex allpass filters, that are maximally flat at /spl omega/=0 is presented. This allpass filter is obtained from a complex all-pole filter with a desired flatness at /spl omega/=0. The parameters of the complex allpass filter design are the order of the filter, N, the degree of flatness, K, and the phase, /spl phi//sub 0/, at /spl omega/=0. The real and imaginary parts of the filter coefficients are computed from the proposed iterative equations.