An Efficient Design Method of Linear-Phase Prototype Lowpass Filter for Near-Perfect Reconstruction Pseudo-QMF Banks 


Vol. 33,  No. 3, pp. 271-280, Mar.  2008


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  Abstract

M channel near-perfect-reconstruction(NPR) pseudo-QMF banks are a hybrid of conventional pseudo-QMF design and spectral factorization approach where the analysis and synthesis filters are cosine-modulated versions of the prototype-lowpass filter(p-LPF). However, p-LPF H(z) does not have linear-phase symmetry as well as magnitude-distortion optimization since it is obtained by spectral factorization of 2M-th band filter G(z)=z-(N-1)H(z-1)H(z). A fair amount of attention , therefore, has been focused on the design of filter banks for reducing only alias-cancellation distortion without reconstructed-amplitude distortion. In this paper, we propose a new method for designing linear-phase p-LPF in NPR pseudo-QMF banks, which is based on Maxflat(maximally flat) FIR filters with closed-form transfer function. In addition, p-LPF H(z) is optimized in this approach so that the 2M-channel overall distortion response represented with G(z)=H²(z) approximately becomes an unit magnitude response. Through several examples of NPR pseudo-QMF banks, it is shown that the peek ripple of the overall magnitude distortion is less than 3.5×10-4 (?-70㏈) and analysis/synthesis filters have the sharp monotone-stopband attenuation exceeding 100 ㏈.

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  Cite this article

[IEEE Style]

J. Jeon, "An Efficient Design Method of Linear-Phase Prototype Lowpass Filter for Near-Perfect Reconstruction Pseudo-QMF Banks," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 3, pp. 271-280, 2008. DOI: .

[ACM Style]

Joonhyeon Jeon. 2008. An Efficient Design Method of Linear-Phase Prototype Lowpass Filter for Near-Perfect Reconstruction Pseudo-QMF Banks. The Journal of Korean Institute of Communications and Information Sciences, 33, 3, (2008), 271-280. DOI: .

[KICS Style]

Joonhyeon Jeon, "An Efficient Design Method of Linear-Phase Prototype Lowpass Filter for Near-Perfect Reconstruction Pseudo-QMF Banks," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 3, pp. 271-280, 3. 2008.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880