Weighted minimax design of fir QMF banks: Results and comparisons

An iterative method proposed by Chen and Lee, with certain modifications based on the weighted least squares (WLS) updating scheme proposed by Sunder and Ramachandran, is applied to the design of FIR quadrature mirror-image filter (QMF) banks. The method is used to design QMF banks having equiripple reconstruction error with analysis and synthesis filters having equiripple or least squares stop-band errors. The results are then compared with results obtained by other WLS methods described in the literature. The modified WLS method is simple and somewhat more efficient than existing WLS methods. The design of QMF banks satisfying prescribed specifications is also considered.