一种基于SoPC技术的iLBC语音编解码器设计实现  

Research of iLBC Codec Based on SoPC Technology

作　　者：张国印[1] 刘铭[1] 姚爱红 

机构地区：[1]哈尔滨工程大学计算机科学与技术学院,黑龙江哈尔滨150001

出　　处：《小型微型计算机系统》2010年第5期1016-1020,共5页Journal of Chinese Computer Systems

摘　　要：基于VoIP技术的语音通信发展迅速,单芯片VoIP处理器的设计方法成为当前的研究热点.iLBC作为专为窄带通信而设计的VoIP语音编解码器,可以在丢包率和延迟较高的网络环境中保持良好的语音通话质量,具有广泛的应用前景.传统的基于DSP处理器实现方法具有芯片面积大、功耗高等缺点,难以满足VoIP系统集成度高、低功耗和易于升级等需求.本文提出了一种基于SoPC技术的iLBC语音编解码器实现方案,并对自相关计算算法进行了并行计算硬件IP核设计,提高了系统的集成度、计算性能和可扩展性.理论分析和实验结果表明并行自相关计算结构有效减少了访存次数,可以获得接近30的加速比.Voice Communication based on VoIP technology develops quickly and design methods of VoIP processor on a single chip become a research focus. iLBC is designed for narrow band speech and enables graceful speech quality degradation in the case of lost frames,so it has a wide application prospect. Traditional solution based on DSP processor has the disadvantages of large chip area,and high power which cannot meet the necessities of high integration,low power and easy for upgrade in VoIP system. A SoPC based solution of iLBC is proposed and parallel computing IP core is designed for autocorrelation computing algorithm in this paper. The solution improves the density of integration,computing speed and scalability of VoIP system. Theoretical analysis and experiment results demonstrate that memory access operation is reduced efficiently and the speedup radio of parallel computing architecture is approximate 30.

关 键 词：VoIP ILBC 语音压缩算法 可编程片上系统 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]