Real-time implementation of the 2.4kbps EHSX Speech Coder Using a TMS320C6701^TM DSPCore 


Vol. 29,  No. 7, pp. 962-970, Jul.  2004


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  Abstract

This paper presents an efficient implementation of the 2.4 kbps EHSX(Enhanced Harmonic Stochastic Excitation) speech coder on a TMS320C6701^TM floating-point digital signal processor. The EHSX speech codec is based on a harmonic and CELP(Code Excited Linear Prediction) modeling of the excitation signal respectively according to the frame characteristic such as a voiced speech and an unvoiced speech. In this paper, we represent the optimization methods to reduce the complexity for real-time implementation. The complexity in the filtering of a CELP algorithm that is the main pan for the EHSX algorithm complexity can be reduced by convening program using floating-point variable to program using floating-point variable. We also present the efficient optimization methods including the code allocation considering a DSP architecture and the low complexity algorithm of harmonic/pitch search in encoder pan. Finally, we obtained the subjective quality of MOS 3.28 from speech quality test using the PESQ(perceptual evaluation of speech quality), ITU-T Recommendation P.862 and could get a goal of realtime operation of the EHSX codec.

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  Cite this article

[IEEE Style]

Y. Yang, I. Lee, O. kwon, "Real-time implementation of the 2.4kbps EHSX Speech Coder Using a TMS320C6701^TM DSPCore," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 7, pp. 962-970, 2004. DOI: .

[ACM Style]

Yong-ho Yang, In-sung Lee, and Oh-Ju kwon. 2004. Real-time implementation of the 2.4kbps EHSX Speech Coder Using a TMS320C6701^TM DSPCore. The Journal of Korean Institute of Communications and Information Sciences, 29, 7, (2004), 962-970. DOI: .

[KICS Style]

Yong-ho Yang, In-sung Lee, Oh-Ju kwon, "Real-time implementation of the 2.4kbps EHSX Speech Coder Using a TMS320C6701^TM DSPCore," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 7, pp. 962-970, 7. 2004.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880