An Enhanced Insertion Packet Loss Concealment Method for Voice Over IP Network Services

摘要

In this paper, a Packet Loss Concealment (PLC) algorithm for ITU-G.722.2 speech coder is proposed in order to improve the decoded speech quality under burst packet loss conditions over packet-switched networks. First, we evaluated the repetition of the last received frame method in order to improve the concealment of lost frames. Then, we made a statistical study to evaluate the correlation between parameters values of adjacent frames. Finally, we present a new PLC method for ITU-G.722.2 by proposing an efficient approach to sending the side information to improve concealment of the lost frames and to resynchronize the encoder and decoder. The proposed method significantly improves the robustness of the ITU-G.722.2 codec against packet losses for voice over networks services. Tests in terms of Wideband Perceptual Evaluation of Speech Quality Mean Opinion Score (WB-PESQ MOS) quality measure and MUlti-Stimulus test with Hidden Reference and Anchor (MUSHRA) evaluation confirm the superiority of our proposed method against the PLC method embedded in G.722.2.