IIR QMF-bank design for speech and audio subband coding

Author

Löllmann, Heinrich W. ; Hildenbrand, Matthias ; Geiser, Bernd ; Vary, Peter

Author_Institution

Inst. of Commun. Syst. & Data Process. (IND), RWTH Aachen Univ., Aachen, Germany

fYear

2009

fDate

18-21 Oct. 2009

Firstpage

269

Lastpage

272

Abstract

A new speech and audio codec has been submitted recently to ITU-T by a consortium of Huawei and ETRI as candidate proposal for the super-wideband and stereo extensions of ITU-T Rec. G.729.1 and G.718. This hierarchical codec with bit rates from 8-64 kbit/s relies on a subband splitting by means of a quadrature-mirror filter-bank (QMF-bank). For this, an allpass-based QMF-bank is used whose design and implementation is presented in this contribution. This IIR filter-bank allows to achieve a significantly lower signal delay in comparison to the traditional FIR QMF-bank solution without a compromise for the speech and audio quality.

Keywords

IIR filters; all-pass filters; audio coding; channel bank filters; quadrature mirror filters; speech coding; Huawei-ETRI consortium; IIR allpass-based QMF-bank design; ITU-T Rec. G.729.1-G.718; bit rate 8 kbit/s to 64 kbit/s; hierarchical codec; quadrature-mirror filter-bank; signal delay; speech-audio subband coding; subband splitting; Audio coding; Bit rate; Decoding; Delay; Finite impulse response filter; IIR filters; Proposals; Speech codecs; Speech coding; Speech processing; IIR filter-banks; ITU-T; QMF-banks; allpass filters; speech and audio coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Signal Processing to Audio and Acoustics, 2009. WASPAA '09. IEEE Workshop on

Conference_Location

New Paltz, NY

ISSN

1931-1168

Print_ISBN

978-1-4244-3678-1

Electronic_ISBN

1931-1168

Type

conf

DOI

10.1109/ASPAA.2009.5346512

Filename

5346512