| Paper: | SP-P1.1 | ||
| Session: | Speech Coding for Networks / Single-Channel Speech Enhancement | ||
| Time: | Tuesday, May 18, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Speech Processing: Narrowband Speech Coding | ||
| Title: | A STUDY OF DESIGN COMPROMISES FOR SPEECH CODERS IN PACKET NETWORKS | ||
| Authors: | Roch Lefebvre; University of Sherbrooke | ||
| Philippe Gournay; University of Sherbrooke | |||
| Redwan Salami; VoiceAge Corporation | |||
| Abstract: | In this paper, we present an objective and subjective comparison of alternate methods for improving the robustness of speech coders in packet networks. Two approaches are considered: 1) adding redundancy in the packets to improve the robustness of a baseline encoder or 2) reducing (or eliminating) inter-frame dependencies at the encoder. It is shown that both approaches have to trade bit rate and/or delay for quality over lossy channels. Formal subjective tests clearly show that using relatively simple forward error correction methods, standard coders such as ITU-T recommendation G.729 can be made significantly more robust than “frame-independent” coders, at a lower or similar bit rate. | ||
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