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A 4 kb/s hybrid MELP/CELP speech coding candidate for ITU standardization | IEEE Conference Publication | IEEE Xplore

A 4 kb/s hybrid MELP/CELP speech coding candidate for ITU standardization


Abstract:

This paper presents an improved 4 kb/s hybrid MELP/CELP speech coder submitted as a candidate for ITU standardization. The coder uses three modes: a high-quality MELP cod...Show More

Abstract:

This paper presents an improved 4 kb/s hybrid MELP/CELP speech coder submitted as a candidate for ITU standardization. The coder uses three modes: a high-quality MELP coder for strongly voiced speech frames, an ACELP coder with pitch prediction for weakly voiced frames, and a stochastic CELP coder for unvoiced frames. We present recent enhancements to this coder, both to improve speech quality and to reduce coder complexity. Previous lTU Selection Testing results on an earlier version of this coder showed that it met nearly all requirements for toll-quality speech, more than any other candidate. Our internal testing shows that the current reduced-complexity fixed-point coder maintains this high performance.
Date of Conference: 13-17 May 2002
Date Added to IEEE Xplore: 07 April 2011
Print ISBN:0-7803-7402-9
Print ISSN: 1520-6149
Conference Location: Orlando, FL, USA

References

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