| ITU-T G.723.1语音编码算法分析及优化策略 |
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| 引用本文： | 李纯静,沈保锁. ITU-T G.723.1语音编码算法分析及优化策略[J]. 电子测量技术, 2007, 30(9): 104-106,139 |
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| 作者姓名： | 李纯静 沈保锁 |
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| 作者单位： | 天津大学电子信息工程学院,天津,300072;天津大学电子信息工程学院,天津,300072 |
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| 摘 要： | 本文介绍了国际电信联盟(ITU)建议中G.723.1低速率语音编码器的基本原理,分析了其中主要模块的实现算法,并对一些计算量较大的模块(基因估计、自适应码本搜索、固定码本搜索)提出优化策略,对编码时间进行优化,使得算法有可能在DSP上实时实现.通过对根据优化策略优化的代码和未优化代码的测试分析,结果显示,优化代码比未优化代码的运行时间减少了21%～31%.
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| 关 键 词： | 语音编码器 线性预测编码 基因估计 优化 |
Analysis and optimization of ITU-T G.723.1 speech coder |
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| Li Chunjing,Shen Baosuo. Analysis and optimization of ITU-T G.723.1 speech coder[J]. Electronic Measurement Technology, 2007, 30(9): 104-106,139 |
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| Authors: | Li Chunjing Shen Baosuo |
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| Affiliation: | School of Electronic and Information Engineering, Tianjin University, Tianjin 300072 |
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| Abstract: | Introducing the principle of G.723.1 low bit-rate speech coder in International Telecom Union(ITU),analyzing the implementation algorithm of some important modules,and puting forward optimization strategy to these the modules with large computational complexity such as pitch estimation module,the adaptive and fixed code-book research modules,and also optimize the running time of the coder to make it possible to realize the real time implementation of G.723.1 on DSP.Experimental results show that the running time of the optimized source code is decreased by 21%~31% in comparison with that of the non-optimized one. |
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| Keywords: | speech coder linear predictive coding pitch estimation optimization |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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