The use of FEC method for packet loss concealment for CELP based coders in packet networks

摘要

This paper presents a packet loss concealment method based on media specific forward error correction (MS-FEC) to improve speech quality deterioration caused by packet losses for CELP based coders. Based on the ITU G.729 CS-ACELP codec operating at 8 Kbps, we applied our metho to evaluate its performance. The enhanced modified bark spectral distortion (EMBSD) and perceptual evaluation of speech quality (PESQ) tests under various packet loss rates confirm that the proposed scheme is superior to the concealment algorithm embedded in the standard if the ITU G.729. The performance measures prove that our concealment method based MS-FEC is better in terms of EMBSD and PESQ.