A CELP-Wavelet Scalable Wideband Speech Coder

Authors:

de Meuleneire, M. ,  Taddei, H. ,  de Zélicourt, O. ,  Pastor, D. ,  Jax, P.

Book Title:

Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

Volume:

I

Pages:

p.p. 697-700

Address:

Toulouse, France

Date:

May. 2006

Language:

English

Abstract

This paper presents a scalable wideband speech codec working at bitrates ranging from 8 to 32 kbit/s. The core layer is the ITU-T G.729 at 8 kbit/s. A first enhancement layer is a bandwidth extension algorithm requiring 2 kbit/s to widen the G.729 narrow band output speech. The difference between the wideband original and reconstructed signal is transformed in the time-frequency domain by a full wavelet decomposition. The resulting coefficients are quantized by an embedded quantizer at 22 kbit/s. Listening tests show the relevance of such a scheme when compared to a pure wavelet packet decomposition. In addition, listening tests suggest that the proposed codec is equivalent to the ITU-T G.722 at 48 kbit/s for speech signals.

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