Design of low-delay nonuniform oversampled filterbanks

Low-delay nonuniform oversampled filterbanks have a good applicability in real-time audio applications. An appealing trade-off between complexity and frequency division is obtained by using filterbanks having uniform sections generated by generalized DFT modulation, with transition filters between the uniform sections. We propose two methods for designing such filterbanks, with no restrictions on the widths of transition filters. The first method is iterative and each iteration consists of convex optimization problems. In the second, faster method, the transition filters are designed using a frequency sampling technique. We present an example of design showing the good results of the proposed methods.