| Paper: | SLP-P9.6 | ||
| Session: | Speech Coding | ||
| Time: | Wednesday, May 17, 14:00 - 16:00 | ||
| Presentation: | Poster | ||
| Topic: | Speech and Spoken Language Processing: Wide-band Speech Coding | ||
| Title: | A CELP-Wavelet Scalable Wideband Speech Coder | ||
| Authors: | Mickael De Meuleneire, BenQ Mobile, Germany; Hervé Taddei, Olivier de Zélicourt, Siemens AG, Germany; Dominique Pastor, ENST Bretagne, France; Peter Jax, University of Technology Aachen (RWTH), France | ||
| 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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