M-channel pseudo-quadrature-mirror-filter (QMF) banks using a prototype filter having a linear-phase spectral-factor of a 2M.sup.th band filter. The overall transfer function of the analysis filter/synthesis filter system is a delay, and the aliasing cancellation has all the significant aliasing terms...http://www.google.de/patents/US5436940?utm_source=gb-gplus-sharePatent US5436940 - Quadrature mirror filter banks and method
