基于双边线性预测的信包丢失隐藏算法  

A Packet Loss Concealment Algorithm Based on Two-Sided Linear Prediction

作　　者：谢青松[1] 魏维[1] 罗凯[1] 

机构地区：[1]西安通信学院,西安710106

出　　处：《信号处理》2008年第2期320-323,共4页Journal of Signal Processing

摘　　要：本文提出了一种基于双边线性预测的信包丢失隐藏算法。该方法利用丢失信包的前一信包或邻接信包(在后一信包可获得的情况下)预测丢失信包。线性加权双边线性预测的样点获得最终的重建信号。使用重叠相加和幅度调整操作平滑重建信号和真实信号之间的边界。经过非正式试听和ITU-T P.862协议所推荐的PESQ算法测试,本文建议算法的重建语音信号质量,与其他四种流行重建算法相比有了较为明显的改善。This paper presents a two-sided linear prediction based packet loss concealment （PLC） algorithm which predicts lost paekets from speeeh segments via either preceding, or both preceding and subsequent packets （ If subsequent packet is available ）. Predicted samples are smoothed by linear weighting to obtain the final reconstructed signal. It also performs overlap-and-adding and amplitude-scaling operations to alleviate discontinuity at packet boundaries. The assessment of resultant speech quality via informal listening test and objective measurement with PESQE61 algorithm from ITU-T P. 862 shows that the proposed algorithm has significantly improved the performance, compared with other four popular reconstruction algorithms.

关 键 词：基于IP语音(VoIP) 信包丢失隐藏(PLC) 基于双边线性预测的重建 语音质量的感知评估(PESQ) 

分 类 号：TN912.32[电子电信—通信与信息系统] TN912.3[电子电信—信息与通信工程]