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| Paper: | SP-P1.6 |
| Session: | Speech Coding for Networks / Single-Channel Speech Enhancement |
| Time: | Tuesday, May 18, 13:00 - 15:00 |
| Presentation: |
Poster |
| Topic: |
Speech Processing: Wideband Speech Coding |
| Title: |
A BIT-RATE/BANDWIDTH SCALABLE SPEECH CODER BASED ON ITU-T G.723.1 STANDARD |
| Authors: |
Sung-Kyo Jung; Yonsei University | | |
| | Kyung-Tae Kim; Yonsei University | | |
| | Hong-Goo Kang; Yonsei University | | |
| Abstract: |
This paper presents a new scalable coder based on ITU-T G.723.1standard which is one of the most famous speech coders for VoIPapplications. In order to support both bit-rate scalability andbandwidth scalability, the proposed coder adopts a split-bandapproach, where the input signal, sampled at 16 kHz, is decomposed into two equal frequency bands. The lower-band speech is coded with the standard coder such as G.723.1 coder. In addition, the low-band enhancement layer for the lower-band speech improves the perceptual quality of decoded speech by employing additional coding units based on cascaded codebook approach. The higher-band signal is encoded using an MDCT-based transform coding scheme. The proposed coder at a bit-rate of 19.4 kbit/s provides better than ITU 24 kbit/s G.722.1 coder, while it also has interoperability with G.723.1. |
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