| 一种基于G.729语音编码的改进算法 |
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| 引用本文： | 巫洪伟,和应民. 一种基于G.729语音编码的改进算法[J]. 应用科技, 2007, 34(4): 16-19 |
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| 作者姓名： | 巫洪伟 和应民 |
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| 作者单位： | 哈尔滨工程大学,信息与通信工程学院,黑龙江,哈尔滨,150001 |
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| 摘 要： | 共轭代数码本激励线性预测（CS，ACELP）语音编码算法在8kb／s速率上获得了比较理想的质量，是以10ms为一短时语音帧作为处理对象．基于CS．ACELP语音编码算法，以20ms为一语音帧，在编码器中引入脉冲散布技术，提出了一种使码速降低至4kb／s的散布脉冲代数码本激励线性预测（PD—ACELP）编码算法．经仿真实验及主观听觉测试表明，这种算法的合成语音质量还是比较令人满意的．
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| 关 键 词： | 语音编码 线性预测 脉冲散布 码本搜索 |
| 文章编号： | 1009-671X（2007）04-0016-04 |
| 收稿时间： | 2006-11-03 |
| 修稿时间： | 2006-11-03 |
An improved algorithm based on G.729 speech coding |
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| WU Hong-wei,HE Ying-min. An improved algorithm based on G.729 speech coding[J]. Applied Science and Technology, 2007, 34(4): 16-19 |
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| Authors: | WU Hong-wei HE Ying-min |
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| Abstract: | The quality of the conjugate-structure algebraic-code-excited linear-prediction(CS-ACELP) algorithm is fairly high at the bit-rate of 8 kb/s,which employs a 10 ms-short-time voice-frame as a processing object.On the basis of CS-ACELP algorithm,taking 20 ms-short-time as a voice-frame and using pulse-dispersion technique,a PD-ACELP algorithm is proposed that decreases the bit-rate to 4 kb/s.Both computer simulations and subjective hearing tests show that the synthetic speech quality of the coding algorithm is fairly satisfactory. |
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| Keywords: | speech coding linear prediction pulse-dispersion codebook research |
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