| 刘华,欧阳宏志,左望霞.ACELP语音编码算法改进与仿真[J].南华大学学报(自然科学版),2010,24(2):47~51.[LIU Hua,OUYANG Hong-zhi,ZUO Wang-xia.Improvement and Simulation for the ACELP Speech Encoding Algorithm[J].Journal of University of South China(Science and Technology),2010,24(2):47~51.] |
| ACELP语音编码算法改进与仿真 |
| Improvement and Simulation for the ACELP Speech Encoding Algorithm |
| 投稿时间：2010-01-17 |
| DOI： |
| 中文关键词: 代数码激励线性预测 自适应码本搜索 时间复杂度 |
| 英文关键词:algebra code-excited linear prediction search for adaptive codebook time complexity |
| 基金项目:湖南省教育厅基金资助项目（09C855） |
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| 中文摘要: |
| 代数码激励线性预测算法（ACELP）是目前诸多低速率语音编码标准的算法核心,包括3G语音标准VSELP、AMR、AMR-NB、AMR-WB.该算法基于码激励线性预测模型,通过对码本的有效搜索,确定基音延迟,算法时间复杂度为O(n3).本文在ACELP算法基础上,对ACELP中自适应码本搜索过程进行改进,提出E-ACELP算法.通过AMR标准中8种速率情况的仿真,E-ACELP算法码本搜索时间减少、时间复杂度下降.基于E-ACELP算法,语音编码标准性能和效率得到提高. |
| 英文摘要: |
| The algebra code-excited linear prediction(ACELP) is the core algorithm of a lot of low bit rate speech coding standards,including the 3G speech standard VSELP,AMR,AMR-NB,AMR-WB.The algorithm is based on code excited linear prediction model.The pitch delay is determined by the effective codebook search.The algorithm’s time complexity is O (n3).Based on the ACELP,this paper proposes an improved algorithm called E-ACELP.E-ACELP reduces the time of codebook search and time complexity through the simulation of eight ratios for AMR.The performance and efficiency of the standards based on ACELP are improved. |
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