联合UEP和丢失帧隐藏的eX-CELP语音编码差错控制方案  

Error control scheme for eX-CELP based on combination of UEP and concealment of missing frames

作　　者：孙浩海[1] 张雄伟[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2005年第4期320-324,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

摘　　要：为提高语音通信可靠性,研究了基于4kb/seX-CELP语音编码算法的差错控制方案,提出了一种利用PESQ算法评估参数帧不同比特的差错敏感度的方法,讨论了将4kb/s编码算法应用于几个常用的语音通信速率时的前向不等差错保护机制,并利用纠错结果和语音编码参数特点,对丢失帧进行后向的隐藏和恢复。实验结果表明,该方案不仅可以在各常用编码速率上为用户提供高质量话音,而且具有更强的抗信道误码的能力。In order to achieve robust speech communication, an error control scheme for 4kb/s eX-CELP vocoder based on the combination of UEP and concealment of missing frame was researched. An objective method based on PESQ to determine the error sensitivities of various bits was presented at first, then several key techniques was discussed in detail. Experiment results show this scheme can provide high quality speech at several common speech communication rates, and has the ability to self-recover from transmission errors.

关 键 词：语音编码 不等差错保护 丢失帧隐藏 扩展码激励线性预测编码 

分 类 号：TN912.3[电子电信—通信与信息系统]