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Transcoding Algorithm for SMV and G.723.1 Vocoders via Direct Parameter Transformation  

서성호 (한국과학기술원 전자전산학과)
장달원 (한국과학기술원 전자전산학과)
이선일 (한국과학기술원 전자전산학과)
유창동 (한국과학기술원 전자전산학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.40, no.6, 2003 , pp. 61-70 More about this Journal
Abstract
In this paper, a transcoding algorithm for the Selectable Mode Vocoder (SMV) and the G.723.1 speech coder via direct parameter transformation is proposed. In contrast to the conventional tandem transcoding algorithm, the proposed algorithm converts the parameters of one coder to the other without going through the decoding and encoding process. The proposed algorithm is composed of four parts: the parameter decoding, line spectral pair (LSP) conversion, pitch period conversion, excitation conversion and rate selection. The evaluation results show that the proposed algorithm achieves equivalent speech quality to that of tandem transcoding with reduced computational complexity and delay.
Keywords
transcoding; SMV; G.723.1; tandem; direct parameter transformation;
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  • Reference
1 ITU- T Rec. G.723.1, 'Dual-rate Speech Coder For Multimedia Communications Transmitting at 5.3 and 6.3 kbit/s', 1996
2 ITU-T Rec. G.723.1 - Annex A, 'Silence Compression Scheme', 1995
3 Hong-Goo Kang, Hong-Kook Kim, R.V. Cox, 'Improving transcoding capability of speech coders in clean and frame erasured channel environments,' In Proc. IEEE Workshop on Speech Coding, 2000, pp. 78-80, Jan., 2000   DOI
4 3GPP2 Spec., 'Selectable Mode Vocoder Service Option for Wideband Spread Spectrum Communication Systems', 3GPP2-C.S0030-0 v2.0, Dec. 2001
5 Yang Gao, A. Benyassine, J. Thyssen, Huan-yu Su, E. Shlomot, 'EX-CELP : A Speech Coding Paradig', In Proc. ICASSP 2001, vol. 2, pp. 689-692, 2001   DOI
6 Sung Wan Yoon, Sung Kyo Jung, Young Cheal Park, and Dae Hee Youn, 'An efficient transcoding algorithm for G.723.1 and G.729A speech coders', In Proc. Eurospeech 2001, vol. 4, pp. 2499-2502, 2001
7 Sunil Lee, Seangho Sea, Dalwon Jang, Chang D. Yoo, 'A novel transcoding algorithm for AMR and EVRC speech coders via direct parameter transformation,' In. Proc. ICASSP 2003, 2003   DOI
8 ITU-T Rec. P.862, 'Perceptual evaluation of speech quality (PESQ), an objective method for end-to-end speech quality assessment of narrowband telephone networks and speech codecs,' 2000