ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Fixed Point Implementation of the QCELP Speech Coder

  • Published : 1997.10.31
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Abstract

The Qualcomm code excited linear prediction (QCELP) speech coder was adopted to increase the capacity of the CDMA Mobile System (CMS). In this paper, we implemented the QCELP speech coding algorithm by using TMS320C50 fixed point DSP chip. Also the fixed point simulation was done with C language. The computation complexity of QCELP on TMS320C50 was 10k words and data memory was 4k words. In the normal call test on the CMS, where mobile to mobile call test was done in the bypass mode without double vocoding, mean opinion score for the speech quality was he Qualcomm code excited linear prediction (QCELP) speech quality was 3.11.

Keywords

References

  1. User's Performance Requirements Cellular Telecommunications Industry Association
  2. Proc. Int. Conf. Acoust., Speech, Signal Processing Code-excited linear prediction (CELP): High quality speech at very low bit rates Schroeder, M.R.;Atal, B.S.
  3. Speech and Audio Coding for Wireless and Network Applications Atal, Bishnu S.;Cuperman, Vladmior;Gersho, Allen
  4. Fundamentals of Speech Signal Processing Saito, Shuzo;Kakata, Kazuo
  5. IEEE Journal on Selected Areas in Communications v.6 no.2 Quantizer design in LSP speech analysis- synthesis Sugamura, Noboru;Farvardin, Nariman
  6. TIA/EIA IS-96, Speech Service Option Standard for Wideband Spread Sprectrum Digital Cellular System TIA
  7. Proc. Int. Conf. Acoust., Speech, Signal Processing Speech coding using pseudo-stochastic block codes Lin, D.
  8. IEEE Trans. Consumer Electronics v.37 no.4 Real-time implementation of the VSELP on a 16-bit DSP chip Sunwoo, M.H.;Park, S.
  9. Proc. International Conference on Signal Processing Applications & Technology Real time implementation of QCELP vocoder in CDMA system using TMS320C50 fixed point DSP chip Yoon, B.;Lee, I.;Kim, J.;Lee, W.;Jang, S.;Lim, M.;Jang, K. Han
  10. IEEE Trans. on Vehicular Technology v.43 no.3 A toll quality 8 Kb/s speech codec for the personal communications system Salami, Redwan;Laflamme, Claude;Adoul, Jean-Pierre;Massaloux, Dominique