Design of oversampled NPR DFT modulated filter bank
Xiaolong Wang · Computer Engineering and Applications Journal · 2007
A new simpler method for the design of oversampled Nearly Perfect Reconstruction(NPR) DFT modulated filter banks with different analysis and synthesis prototype filters is presented.In terms of the requirements on the passband,stopband,and system distortion of the filter bank,the design method involves the minimization of the system distortion while constraining the stopband energy of the analysis and synthesis prototype filters.The simpler constraint about passband flatness is introduced at the same time.The proposed method can generate filters with significantly better performance than filters obtained using current design methods,which is also verified by the numerical examples.