G.729语音编解码系统的帧同步实现算法  

Frame synchronization algorithm for G.729 speech-coding system

作　　者：李悦[1] 唐昆[1] 崔慧娟[1] 杜文[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2003年第1期47-50,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：基于帧结构的中低速率语音编解码算法G.729在应用中经常会遇到码流的帧同步问题。为克服传统的帧同步方法会增加码率的缺点,提出了一种通过修改G.729帧结构实现的同步方法。结合G.729的特点,通过比较选择出一种性能较好的失步检测算法,并设计了类似结构的同步捕捉算法。最后将这两部分算法有机地结合起来以省去各部分的初始化过程并使它们协同工作,从而大大地提高了整体性能。同时还给出了详细的性能分析,结果显示出了良好的性能指标,在实际应用中也已得到了证明。Frame synchronization of the bit stream is often required when using the low bitrate framebased speechcoding algorithm G.729. A new synchronization method was developed to avoid the disadvantages of most traditional methods that often increase the bitrate. The method changes the G.729 frame structure to create an outofframe algorithm that performce better than the G.729 algorithm. The synchronization method was combined with a synchronization catch algorithm with a similar structure so that they can cooperate and their initializations can be removed. The overall performance is improved greatly. 

关 键 词：G.729 语音编解码系统 帧同步 失步检测 同步捕捉 帧结构 语音信号处理 

分 类 号：TN912.3[电子电信—通信与信息系统]