| Paper: | SLP-P9.10 | ||
| 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 NEW POST-FILTERING FOR ARTIFICIALLY REPLICATED HIGH-BAND IN SPEECH CODERS | ||
| Authors: | Guillaume Fuchs, Roch Lefebvre, University of Sherbrooke, Canada | ||
| Abstract: | Pure estimation in bandwidth extension of bandlimited speech does not provide transparent quality. Combining coding and estimation of the missing band can achieve higher quality by transmitting additional information. However, substantial artifacts can remain in the extended band. In this paper, we introduce a new postfiltering designed to reduce these artifacts. Based on a source-filter model, the adopted bandwidth extension transmits spectral envelope parameters, while estimates the excitation. The perceptual quality is then enhanced by processing the estimated excitation by a short-term and a long-term postfilter. Objective and subjective assessments show substantial gains when using the new postfiltering. It confirms that low bit-rate wideband coding based on bandwidth extension can get closer to the performances of the single band wideband coders. | ||
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