| 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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