Near Perfect Reconstruction Polyphase Filterbank Matlab script

Publisher review:
Near Perfect Reconstruction Polyphase Filterbank - a near perfect reconstruction polyphase filterbank with two times oversampling This set of files can be used to construct a polyphase filter bank with near perfect reconstruction. The filter bank is implemented using two uniformly modulated DFT filter banks that are frequency shifted by 1/2 channel width. Effectively, two-times oversampling is used.The number of channels must be a power of two. The number of taps per channel can be freely selected. A script is provided for designing the prototype filter, which is based on a 'root-raised-error-function'. The prototype has exactly linear phase. The filter design toolbox is required for designing the prototype.With 32 taps per channel, an average reconstruction error of -140 dB can be achieved. Channel separation is better than 150 dB. The number of channels must be a power of two.The processing speed is around 200 kSamples/second, for 32 taps / channel, irrespective of the number of channels.With enough memory, a large number of channels (e.g. 64K) is feasible. Requirements: · MATLAB Release: R2007a · Filter Design Toolbox
Operating system:
Windows / Linux / Mac OS / BSD / Solaris

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