摘要： 为减轻基于IP语音(VoIP)网络中因信包丢失而造成的语音失真，提出一种基于双边线性预测和基音调整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)预测丢失的信包。线性加权经过基音调整后的双边线性预测样点以获得最终的重建信号。重建信号在相位连续性上表现更加合理。经过ITU-T P.862协议推荐的PESQ算法测试证明，该算法重建语音信号的质量有了较为明显的改善。

关键词: 基于IP语音, 信包丢失隐藏, 双边线性预测, 基音调整

Abstract: This paper presents a two-sided linear prediction and pitch-adjusted based packet loss concealment algorithm to alleviate the speech distortion caused by lost packets in VoIP. This algorithm predicts lost packets from speech segments via either preceding, or both preceding and subsequent packets (if subsequent packet is available). Predicted samples, whose pitches are modified, are smoothed by linear weighting to obtain the final reconstructed signal which appears more reasonable in phase continuity. The assessment of resultant speech quality via objective measurement with PESQ algorithm from ITU-T P.862 shows that the algorithm significantly improves the performance.

Key words: VoIP, Packet Loss Concealment(PLC), two-sided linear prediction, pitch-adjusted

中图分类号: 

• TP312