Source-based error mitigation for speech transmissions over erasure channels
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. We 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. The spectral distortion measure is also used as an objective distortion measure; the obtained results prove that the interleaving method is better at the expense of extra delay.