IIR QMF-Bank Design for Speech and Audio Subband Coding

Authors:

Löllmann, H. W. ,  Hildenbrand, M. ,  Geiser, B. ,  Vary, P.

Book Title:

Proceedings of IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA)

Organization:

IEEE

Pages:

p.p. 269-272

Address:

New Paltz, NY, USA

Date:

Oct. 2009

ISBN:

978-1-42443-679-8

Language:

English

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 quadraturemirror 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.

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