Improved Harmonic-CELP Speech Coder with Dual Bit-Rates(2.4/4.0 kbps) 


Vol. 28,  No. 3, pp. 239-247, Mar.  2003


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  Abstract

This paper presents a dual-rate (2.4/4.0 kbps) Improved Harmonic-CELP(IHC) speech coder based on the EHC(Efficient Harmonic-CELP) which was presented by the authors. The proposed IHC employs the harmonic coding for voiced and the CELP for unvoiced segments. In the IHC, an initial voiced/unvoiced estimate is obtained by the pitch gain and energy. Then, the final V/UV mode is decided by using the frame energy contour. A new harmonic estimation combining peak picking and delta adjustment provides a more reliable harmonic estimation than that in the EHC. In addition, a noise mixing scheme in conjunction with an improved band voicing measurement provides the naturalness of the synthesized speech. To demonstrate the performance of the proposed IHC coder, the coder has been implemented and compared with the 2.0/4.0 kbps HVXC(Harmonic eXcitation Vector Coding) standardized by MPEG-4. Results of subjective evaluation showed that the proposed IHC coder and produce better speech quality than the HVXC, with only 40% complexity of the HVXC.

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  Cite this article

[IEEE Style]

K. Kim, S. Yoon, Y. Choi, Y. Park, D. Youn, T. Kang, "Improved Harmonic-CELP Speech Coder with Dual Bit-Rates(2.4/4.0 kbps)," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 3, pp. 239-247, 2003. DOI: .

[ACM Style]

Kyong-Min Kim, Sung-Wan Yoon, Yong-Soo Choi, Young-Cheol Park, Dae-Hee Youn, and Tae-Ik Kang. 2003. Improved Harmonic-CELP Speech Coder with Dual Bit-Rates(2.4/4.0 kbps). The Journal of Korean Institute of Communications and Information Sciences, 28, 3, (2003), 239-247. DOI: .

[KICS Style]

Kyong-Min Kim, Sung-Wan Yoon, Yong-Soo Choi, Young-Cheol Park, Dae-Hee Youn, Tae-Ik Kang, "Improved Harmonic-CELP Speech Coder with Dual Bit-Rates(2.4/4.0 kbps)," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 3, pp. 239-247, 3. 2003.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880