On the design of near perfect reconstruction pseudo QMF banks

Author

Nguyen, Truong Q.

Author_Institution

Lincoln Lab., MIT, Lexington, MA, USA

fYear

1993

fDate

1-3 Nov 1993

Firstpage

1320

Abstract

A new approach to the design of M-channel pseudo quadrature mirror filter (QMF) banks is presented. The analysis and synthesis filters are cosine-modulated versions of the prototype filters. The prototype filter is constrained to be a linear-phase spectral-factor of a 2M^th band filter. As a result, the reconstructed signal has no amplitude nor phase distortions. The only error at the output is aliasing, which is comparable to the stopband attenuation of the prototype filter. Using this approach, it is possible to design a pseudo-QMF bank where the stopband attenuation of the analysis (and thus synthesis) filters is on the order of 100 dB. Consequently, the resulting reconstruction error is also on the order of -100 dB. An example is included to demonstrate the theory

Keywords

delay circuits; digital filters; filtering and prediction theory; modulation; network synthesis; 100 dB; M-channel pseudo quadrature mirror filter; analysis filters; cosine-modulated filters; linear-phase spectral-factor; perfect reconstruction pseudo QMF banks; prototype filters; reconstructed signal; reconstruction error; stopband attenuation; synthesis filters; Attenuation; Channel bank filters; Filter bank; Finite impulse response filter; Laboratories; Lattices; Mirrors; Phase distortion; Prototypes; Signal synthesis; Speech coding; Speech synthesis;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 1993. 1993 Conference Record of The Twenty-Seventh Asilomar Conference on

Conference_Location

Pacific Grove, CA

ISSN

1058-6393

Print_ISBN

0-8186-4120-7

Type

conf

DOI

10.1109/ACSSC.1993.342301

Filename

342301