A simple design method for nonuniform multirate filter banks

The theory and design of perfect-reconstruction uniform-band QMF banks have been extensively studied. For nonuniform-band filter banks, there is a lack of efficient design methods. We propose a simple design method for nonuniform integer-decimated filter banks (near perfect reconstruction). The approach is to transform the nonuniform filter bank design problem to a corresponding uniform filter bank design problem. Therefore, only one prototype filter needs to be designed. The analysis and synthesis filters are simple combinations of the cosine modulated versions of the prototype filter. An example is given to demonstrate the proposed method