Improved Packet Loss Recovery Using Interleaving for CELP-Type Speech Coders in Packet Networks

In VoIP applications, packet loss is a major source of speech impairment. In this paper, a packet loss concealment scheme based interleaving is presented to improve speech quality deterioration caused by packet losses for Code-Excited Linear Prediction (CELP) based coders. The authors applied the proposed scheme to the ITU-T G729 8 kb/s speech coding standard to evaluate the performance of the proposed method. The Perceptual Evaluation of Speech Quality (PESQ) and Enhanced Modified Bark Spectral Distortion (EMBSD) tests under various packet loss conditions confirm that the proposed algorithm is superior to the concealment algorithm embedded in the G729.