An efficient and simple method for designing prototype filters for cosine-modulated pseudo-QMF banks
Fernando Cruz–Roldán, Pedro Amo-López, Saturnino Maldonado-Bascón, S.S. Lawson · IEEE Signal Processing Letters · 2002
We present a new method to design prototype filters for conventional cosine-modulated pseudo-quadrature mirror filter (QMF) banks. This method is based on windowing, and sets the 3-dB cutoff frequency of the filter obtained at /spl pi//2M. In this way, the filter bank performance can be significantly improved compared to other existing design methods.