Design of near perfect reconstruction oversampled filter banks for subbandadaptive filters

In this brief, a design algorithm for real-valued and complex-valued oversa mpled filter banks which yield a low level of inband alias and enable simpl e subband adaptive structures is presented. The filter banks are either bas ed on complex modulation of a real-valued low-pass prototype or on the dire ct or modulated setups of real-valued filter banks. If real-valued filter b anks are required, then the different channels will have different subsampl ing ratios so that the bandpass sampling theorem is not violated. This brie f also presents design examples of real-valued and complex-valued filter ba nks.