A simple method for designing pseudo QMF banks

The traditional designs for the prototype filter of M-band pseudo quadrature mirror filter (QMF) banks usually involve nonlinear optimization. A simple design approach that involves the optimization of only a single parameter is presented. In this method, the prototype filter is formulated as an interpolated FIR filter and is indirectly designed by varying the passband edge of the model filter. A design example is presented to show that very good design can be obtained in spite of the limit of the formulation.