【作者】 李强；

【导师】 姚冬苹；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 本文首先介绍了语音处理的基本概念,其中包括语音信号处理分类,发展趋势等。随后在第二章详细介绍了语音信号处理常用的技术,其中包括LPC,CELP,MP-LPC。G.723.1(6.3/5.3kbit/s)与G.729(8kbit/s)是ITU-T提出的适合网络通信、无线通信和卫星通信的低速率语音编码标准,都采用了ABS理念进行语音信号压缩。本论文的重点是在于对G.723.1和G.729低速率编码标准的研究与实现工作。在文中详细介绍了G.723.1和G.729编解码流程,比较两者的异同。在本文中主要的实现平台是DSP(TMS320C6416),CODEC(TLV320AIC23),进行了算法的优化及代码的优化工作。保证了语音压缩算法的实时处理。最后给出了主程序流程图和DSP中断处理流程图,并就如何降低算法运算速率及复杂度等问题给出了解决方案。更多还原

【Abstract】 In this paper,the basic concept of voice processing is first introduced, including the category of voice process and its development trend.Then in chapter two the technology of voice signal process is introduced in detail, including LPC,CELP and MP-LPC etc.G.723.1(6.3/5.3kbit/s)and G.729(8kbit/s)are the low bit rate of voice coding standard provided by ITU-T, which can be used for network ,wireless and satellite communication. Both of them use ABS technology for voice compress.The emphases of this paper is research and realization of the low bit rate standard on G.723.1 and G.729.This paper introduce the architecture of G.723.1 and G.729 in detail and compare the difference of them. In this paper, the platfrom for realization is DSP(TMS320C6416),CODEC(TLV320AIC23).We optimize the arithmetic and the code to make sure the voice processing in real-time.At last, the main flowchart and DSP interrupt flowchart are put forward,and relative solutiongs on how to decrease the complexity of vocoders are given.更多还原