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CELP speech coding based on mel-generalized cepstral analyses.

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Názov: CELP speech coding based on mel-generalized cepstral analyses.
Autori: Koishida, Kazuhito1, Tokuda, Keiichi2, Kobayashi, Takao1, Imai, Satoshi3
Zdroj: Electronics & Communications in Japan, Part 3: Fundamental Electronic Science. May2000, Vol. 83 Issue 5, p32-41. 10p.
Predmety: *SPEECH, *CODING theory, *SPECTRUM analysis, *ELECTRONICS, *THEORY of wave motion, *INFORMATION theory
Abstrakt: In this paper, a CELP speech coding scheme based on mel-generalized cepstral analysis is proposed. In this scheme, speech spectra can be represented by mel-generalized cepstra, the representation accuracy of the zero and poles of the spectra can be varied continuously from all-pole model to cepstral model, and perceptual characteristics of humans regarding the frequency resolution can be considered. The encoding and decoding processes of the proposed method are expected to be suitable for human perception since perceptual weighting and postfiltering operations can be performed through mel-generalized cepstral coefficients. The proposed scheme and the conventional CELP scheme based on linear prediction were compared subjectively for a bit rate of 4 kbit/s. The results showed that the proposed scheme outperforms the conventional method by about 2 dB for an equivalent Q value. © 2000 Scripta Technica, Electron Comm Jpn Pt 3, 83(5): 32-41 2000 [ABSTRACT FROM AUTHOR]
Databáza: Academic Search Index
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Abstrakt:In this paper, a CELP speech coding scheme based on mel-generalized cepstral analysis is proposed. In this scheme, speech spectra can be represented by mel-generalized cepstra, the representation accuracy of the zero and poles of the spectra can be varied continuously from all-pole model to cepstral model, and perceptual characteristics of humans regarding the frequency resolution can be considered. The encoding and decoding processes of the proposed method are expected to be suitable for human perception since perceptual weighting and postfiltering operations can be performed through mel-generalized cepstral coefficients. The proposed scheme and the conventional CELP scheme based on linear prediction were compared subjectively for a bit rate of 4 kbit/s. The results showed that the proposed scheme outperforms the conventional method by about 2 dB for an equivalent Q value. © 2000 Scripta Technica, Electron Comm Jpn Pt 3, 83(5): 32-41 2000 [ABSTRACT FROM AUTHOR]
ISSN:10420967
DOI:10.1002/(SICI)1520-6440(200005)83:5<32::AID-ECJC4>3.0.CO;2-A