参考基于dsp（数字信号处理器）的语音信号编码器.doc

摘要
近年来,随着多媒体信息技术和网络技术的高速发展,数字语音压缩技术的应用领域越来越广泛,尤其在可视电话、PI网络电话、数字蜂窝移动通信、综合业务数字网、公共交换电话网和话音存储转发系统等领域中,目的是在保证语音一定质量的前提下尽可能降低其编码比特率,便于在有限的传输带宽内让出更多的信道来传送图像、文档、计算机文件和其他数据流。为此,国际电信联盟(ITU),即共扼结构代数码激励线性预测编码(CS·ACELP)方案,,,两者具有语音质量高、低延时和稳定性好的优点,可用于数字语音通信领域,具有很高的研究价值。本文首先简要的介绍了语音压缩编码算法的发展进程,以及发展趋势。,详细说明了基于高性能DSP(TMS320F2812)的语音压缩编解码系统的实现方法,并针对算法的实时实现出现的运算量大的问题,提出了算法实现的代码优化方法。通过将优化后的算法加载到TMS320F2812中,进行仿真,分析算法的压缩性能。全文概述了语音压缩编解码的发展进程、趋势以及课题的主要研究内容及意义。分析了语音信号编、、硬件的开发和设计。对结果进行讨论与验证。详细的对全文进行了总结。
关键词:语音压缩编码,,,DSP,TMS320F2812
ABSTRACT
With the rapid development of munication technology and technology, Application of Digital speech Coding is more widely in recent years, especially in the area of Visible telephone、IP telephone、Digital cellular munication、Integrated server work、Public Switched work and Packet transfer Voice System,etc. Digital speech Coding can reduce rate of bits ,for the purpose of provided more channels to transfer image、puter files and other Data stream, but the operation must assure quality of speech. So ITU introduce , a pressing criterion, Conjugate-structure Algebraic-Code-Excited Linear-Prediction(CS-ACELP) and criterion, and rate speech Coding in criterion have the advantages of high speech quality、low time delay and good stability,which can be applied in the area of digital munication and be worth researching highly. First of all the development course and tendency of press Coding has been introduced. On the basis of analysis and research to theory of criterion arithmetic,realization of the algorithm of speech coding’s system based on TMS32V0C5509 is narrated .Due to large operation when arithmetic is run in real-time,several methods of optimized codes was put forward .Loaded optimized codes in TM S32V0C5509 and simulated,the arithmetic’s performance pared·
Whole paper summar