A new packet loss concealment algorithm in VoIP

A two-sided linear prediction and pitch-adjusted based packet loss concealment algorithm is presented to alleviate the speech distortion caused by lost packets in VoIP. The 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 even more reasonable in phase continuity. The assessment of resultant speech quality via objective measurement with PESQ [8] algorithm from ITU-T P. 862 shows that the PESQ MOS of proposed algorithm increases by 0.38 at different loss rates, at the cost of computer complexity increases by 0.58, compared with the algorithm proposed in paper [4].