Repetition-based packet lost concealment method for CELP-based coders in packet networks

This paper presents a repetition based packet lost concealment (PLC) method for code excited linear prediction (CELP) based coders in packet networks. We perform a repetition of parameters of the last good frame to construct the missing of corrupted packet. Our approach consists in adding a muting factor, a random Jittering and bandwidth expansion. We applied this scheme to the standard ITU-T G729 standard speech coder for evaluation. Compared to the concealment method embedded in the ITU-G.729, each characteristic gives better performance in terms of average spectral distortion measure and enhanced modified bark spectral distortion tests (EMBSD), over the PLC embedded in the G729. we show that the repetition method outperform significantly the method implemented by the standard G729.