Maximally decimated perfect-reconstruction FIR filter banks with pairwise mirror-image analysis (and synthesis) frequency responses

New structures are presented for the perfect-reconstruction QMF bank, based on lossless building blocks. These structures ensure that the frequency responses of the analysis (and synthesis) filters have pairwise symmetry with respect to ~ / 2 , and require fewer parameters than recently reported structures (also based on lossless building blocks). The design-time based on the new structures is correspondingly much less than the earlier methods which did not incorporate such symmetry.