基于自适应比特分配的DAM声码器
An improved dam vocoder based on adapting BIT allocation
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摘要: 在对离散幅度多分辨率语音编码方案研究的基础上提出了改进算法。该算法通过对编码幅度值统计分析使用了新的编码格式，并应用了缩进式比特自适应分配机制，理论分析和实验结果表明,改进的编码算法可以在相同语音质量的条件下进一步降低比特率。Abstract: An improved method is presented on the base of the study for the discrete-amplitude multi-resolution speech coding. New coding format is adopted through statistical analysis for signal amplitude. Then the indented adapting bit allocation is employed. Theoretical analysis and experimental results show that improved coding method can farther reduce the coding rate maintaining the same speech quality.
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Sun Hong, Yao Tianren, On discrete-amplitude signal analysis and its applications, Science in China (Series E), 1997, 40(3), 243-249.[2]Xu Qiang, Sun Hong, Yao Tianren, Application of discrete amplitude multi-resolution analysis to speech coding, Proc. of ICSP98, Beijing, Oct. 1998, 547-551.[3]J.H. Chen, R. V. Cox, Y. C. Lin, N. Jayant, M. J. Meldner, A low-delay CELP coder for the CCITT 16kb/s speech coding standard, IEEE Jounal on Selected Arcas in Communications,1992, 10(5), 830-849.[4]姚天任,数字语音处理,武汉,华中理工大学出版社,1992,356-364. -
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