Biorthogonal filter banks constructed from four halfband filters

A new class of filter banks, that have structural perfect reconstruction, and its design is presented here. The filters are defined by four halfband filters and are constructed using the lifting scheme. The filter banks here is a generalization of the triplet halfband filter banks proposed by Ansari et. al. (1999). Filters that have linear phase response (symmetric coefficients) and are also virtually energy preserving can be constructed using the class of structure proposed.