G.723.1双速率语音编解码算法的ADSP实现  

Implementation of G.723.1 dual rate codec algorithm in ADSP

作　　者：葛颖[1] 曲芳[1] 

机构地区：[1]天津工程师范学院电子工程学院,天津300222

出　　处：《天津工程师范学院学报》2008年第4期21-24,共4页Journal of Tianji University of Technology and Education

摘　　要：介绍了G.723.1标准信源编码部分编解码原理并对该标准提供的C程序进行了分析。在此基础上,分析了ADSP-2189M芯片的基本结构和特征,讨论了在ADSP-2189M上的实现问题,对算法级和代码级的优化提出了建议。研究证明,G.723.1算法在ADSP-2189上能正确实现,并可以应用于网络上的低速率语音传输。This codec has two kinds of bit rates, i.e., 5.3 kbps and 6.3 kbps, which correspond to two different algorithms. For 5.3 kbps codec, Algebraic Code Excited Linear Prediction （ACELP） principles are used, while for the 6.3 kbps codec, Multi Pulse-Maximum Likelihood Quantization （MP-MLQ） techniques are used.Firstly, the encoding and decoding principles of the source coder of G.723.1 and the C program which is an integral part of the recommendation are analyzed. Then how to implement G.723.1 codec based on ADSP- 2189M. Lastlyis analyzed.And optimizing methods at algorithm and code lever are also discussed.And the resuits have great practical significance, which can be applied to low-rate voice transmission on the network.

关 键 词：G.723.1标准 ADSP-2189M 低速率语音编码 

分 类 号：TN912.3[电子电信—通信与信息系统]