一种面向保密通信的改进型MBE语音编码算法  

Application of Speech Coding Algorithm Based on MBE in Secure Communication

作　　者：李炜[1] 刘加[1] 

机构地区：[1]清华大学电子工程系清华信息科学与技术国家实验室(筹),北京100084

出　　处：《电声技术》2009年第10期78-80,88,共4页Audio Engineering

基　　金：国家自然科学基金委员会与微软亚洲研究院联合资助项目(60776800);国家高技术研究发展计划(863计划)项目(2006AA010101);国家高技术研究发展计划(863计划)项目(2007AA04Z223);国家高技术研究发展计划(863计划)项目(2008AA02Z414)

摘　　要：随着军事通信的应用需求迅速扩展,如何有效地在信源端对语音信号进一步压缩,并且在复杂信道条件下实现高质量的低速率语音编码技术是一个重要研究方向。以MBE语音编码模型为基础,提出了一种改良算法,即在编码端利用信源冗余度,将对语音合成质量影响较大的参数进行检纠错保护,并在解码端采用谐波增强以改善终端语音合成质量。测试数据表明,在1%～3%的信道误码条件下,PESQ评分平均提高了近14%。With the development of military communication and mobile communication, the researches of source coding on low-bit rate and high performance in complex channel condition attract more and more attention. A novel speech coding algorithm is proposed based on MBE（Multi-Band Excitation）. The algorithm protects important parameters by exploiting the redundancy of information source and adopts harmonic enhancement for speech synthesis. With no extra bandwidth consumption, the performance of speech coding in anti channel-error-code and synthesis has improved significantly. Experiments show that, in the condition of channel error rates ranging from 1% to 3%, the PESQ score has improved about 14% on average.

关 键 词：语音编码 抗信道误码 谐波增强 

分 类 号：TN912[电子电信—通信与信息系统]