Design of NPR DFT filter banks with linear phase
Lin Ying · Computer Engineering and Applications Journal · 2009
This paper presents a new method to design oversampled linear phase Nearly Perfect Reconstruction(NPR) DFT mod-ulated filter banks with different analysis and synthesis prototype filters.In terms of the requirements on the aliasing in the sub-band,aliasing in the output,and system distortion of the filter bank,the corresponding design algorithm is derived and given.Us-age of the two prototype filters increases the degrees of freedom available for design and thus the proposed method can achieve better performance.Additionally,due to the linear phase constraint,the constraint on the passband flatness becomes simpler and the design algorithm is significantly simplified.