多带激励语音编码的实现

Implementation of Multi-band Excited Speech Coding

随着信息社会的快速发展，通信信道资源变得非常宝贵，各种语音压缩编码技术应运而生。低速率语音编码已成为数字通信中的一个重要的研究领域。多带激励声码器在2．4～4．8Kb／s速率上能合成出音质比传统声码器好得多的语音，而且具有较好的自然度和容忍环境噪声的能力。MBE声码器作为主要研究对象，从语音分析和语音合成方面对算法做了细致的研究与实现。同时，静音检测算法应用到MBE声码器中，进一步降低了编码速率。最后，通过对仿真结果的分析，针对MBE编码算法的几点不足提出了相应的改进方法。

The sources in communication especially the frequency source become more and more valuable with the development of information society. Then more and more speech compress coding technologies being to decrease bit rate in transmission and data storage quantity when in memory. After many years rapidly development of speech compression technology, it becomes more and more important. Multi - band Excitation （MBE） codec is a better choice among the speech coding algorithms at low rate. It can synthesis better speech than the traditional codec at rate of 2. 4 - 4. 8Kb/s. Its synthetic speech sounds naturally and can endure more noise. MBE codec is taken as the mayor object of research. Detailed research has been done from the aspects of speech analysis and synthesis. In the meantime,the VAD algorithm is applied to the MBE code,in order to reduce the code rate. At last,based on simulations,aiming at MBE codec, improved arithmetic is put forward.