一种CVSD丢包隐藏方法  

Packet loss concealment algorithm for CVSD decoder

作　　者：黄建军[1] 张雄伟[1] 张亚非[1] 邹霞[1] 

机构地区：[1]解放军理工大学指挥自动化学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2011年第4期307-311,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：江苏省自然科学基金资助项目(BK2006001)

摘　　要：CVSD语音编码算法具有抗比特错误能力强的优点,但对于无线分组网络环境下出现的丢包,算法性能急剧下降。为了提高CVSD编码器的抗丢包能力,在解码端嵌入丢包隐藏算法,采用自适应线性预测恢复CVSD解码器的状态,应用同步叠加时长调整技术重建当前丢失的语音包,提出了一种适用于CVSD的丢包隐藏算法。语音测试结果表明,与现有的算法相比,该算法的抗丢包能力更强。Continuously variable slope delta（CVSD） modulation speech coder is a robust speech coding algorithm.When packet loss happens,the quality of speech at the receiver endpoint degrades.A packet loss concealment algorithm embedded in decoder for CVSD was proposed,which introduces adaptive linear prediction to recover CVSD decoding state and reconstructs the loss packets by using synchronized overlap and adding.The simulative results show that the speech quality is obviously improved with the proposed method.

关 键 词：连续可变斜率增量 丢包隐藏 自适应线性预测 同步叠加 

分 类 号：TN912.31[电子电信—通信与信息系统]