Non-uniform and Part-searching-area Algebraic Codebook for 

Code Excited Linear Prediction Speech Coder

Bai Yan-ning; Bao Chang-chun

Volume 28 Issue 11

Sep. 2010

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Article Navigation > Journal of Electronics & Information Technology > 2006 > 28(11): 2041-2044

Bai Yan-ning, Bao Chang-chun. Non-uniform and Part-searching-area Algebraic Codebook for Code Excited Linear Prediction Speech Coder[J]. Journal of Electronics & Information Technology, 2006, 28(11): 2041-2044.

Citation:

Bai Yan-ning, Bao Chang-chun. Non-uniform and Part-searching-area Algebraic Codebook for Code Excited Linear Prediction Speech Coder[J]. Journal of Electronics & Information Technology, 2006, 28(11): 2041-2044.

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Non-uniform and Part-searching-area Algebraic Codebook for Code Excited Linear Prediction Speech Coder

Received Date: 2005-03-21
Rev Recd Date: 2005-10-31
Publish Date: 2006-11-19

Abstract

Abstract

This paper presents a non-uniform and part-searching-area algebraic codebook based on Algebraic Code Excited Linear Preiction(ACELP) speech coding algorithm. The non-uniform algebraic codebook is determined by the non-uniform statistical properties of the algebraic codebook, and the part-searching-area is determined by the periodicity of the algebraic codebook excitation vector, which makes up the insufficient numbers of signed pulses in algebraic codebook at low bit rate. In order to preserve the continuity of pitch, different pitch detection methods are employed for speech/silence frame when these two techniques are used. Subjective and objective test results indicate that the reconstructed speech quality of 4kb/s DP-CELP speech coder is improved based on these techniques, especially for the female speakers.

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References(1)

References

ITU-T Recommendation G.729. Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP), 1996.ITU-T Recommendation G.723.1. Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s, 1996.[2]Yasunaga K, et al.. Dispersed-pulse codebook and its application to a 4kb/s speech coder. IEEE Proc, ICASSP, 2000, Istanbul, Turkey, III : 1503-1506.[3]Gao Y, et al.. eX-CELP: A speech coding paradigm. IEEE Proc, ICASSP, 2001, Salt Lake City, Utah, II : 689-692.[4]Rao A V, Ahmadi S, et al.. Pitch adaptive windows for improved excitation coding in low-rate CELP coders[J].IEEE Trans. on Speech Audio Processing.2003, 11(6):648-659[5]鲍长春. 高质量的4kb/s散布脉冲CELP语音编码算法. 电子学报, 2003, 31(2): 309-313.[6]李悦，唐昆等. 高质量3.35kb/s MPD-USACELP语音编码算法研究. 清华大学学报(自然科学版), 2004, 44(10): 1410-1413.[7]Chu W C. Speech coding algorithmsFoundation and evolution of standardized coders. New Jersey: Wiley-Interscience, 2003: 471-474.[8]Bao Changchun. Harmonic excited LPC (HE-LPC) speech coding at 2.3kb/s. IEEE Proc. ICASSP, 2003, Hongkong, I : 784-787.[9]ITU-T Recommendation P.862. Perceptual evaluation of speech quality (PESQ), 2001.

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