An Enhanced MELP Vocoder in Noise Environments 


Vol. 28,  No. 1, pp. 81-89, Jan.  2003


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  Abstract

For improving the performance of noise suppression in tactical communication environments, an enhanced MELP vocoder is suggested, in which an acoustic noise suppressor is integrated into the fromt end of the MELP algorithm, and an FEC code into the channel side of the MELP algorithm The acoustic noise suppressor is the modified IS-127 EVRC noise suppressor which is adapted for the MELP vocoder. As for FEC, the turbo code, which consists of rate-1/3 encoding and BCJR-MAP decoding algorithm, is utilized
In acoustic noise environments, the lower the SNR becomes, the more the effects of noise suppression is increased Moreover, The suggested system has greater noise suppression effects in stationary noise than in non-stationary noise, and shows its superiority by 0.24 in MOS test to the original MELP vocoder When the interleaver size is one MELP frame, BER 10-6 is accomplished at channel bit SNR 4.2 dB The iteration of decoding at 3 times is suboptimal in its complexity vs performance Synthetic quality is realized as more than MOS 2.5 at channel bit SNR 2 dB in subjective voice quality test, when the interleaver size is one MELP frame and the iteration of decoding is more than 3 times.

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  Cite this article

[IEEE Style]

Y. Chun and B. Jun, "An Enhanced MELP Vocoder in Noise Environments," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 1, pp. 81-89, 2003. DOI: .

[ACM Style]

Yong-uk Chun and Byung-min Jun. 2003. An Enhanced MELP Vocoder in Noise Environments. The Journal of Korean Institute of Communications and Information Sciences, 28, 1, (2003), 81-89. DOI: .

[KICS Style]

Yong-uk Chun and Byung-min Jun, "An Enhanced MELP Vocoder in Noise Environments," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 1, pp. 81-89, 1. 2003.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880