A packet loss concealment algorithm based on time-scale modification for CELP-type speech coders

Moon Keun Lee, Sung Kyo Jung, Hong Goo Kang, Young Cheol Park, Dae Hee Youn

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


In this paper, we propose a packet loss concealment algorithm for a code-excited linear prediction (CELP) speech coder. We perform a time-scale modification (TSM) using a waveform similarity overlap-add (WSOLA) technique to reconstruct the excitation signal of the lost or dropped frames. In addition, when a lost frame is classified as a voiced, an adaptive codebook gain and a fixed codebook gain are estimated by a modified gain parameter re-estimation (GRE) technique. By applying these techniques, we can reduce quality degradation of the decoded speech and error propagation effect through the adaptive codebook memory. We apply the proposed scheme to the ITU-T G.729 standard speech coder to evaluate the performance of the proposed method. The perceptual evaluation of speech quality (PESQ) and AB preference tests under various packet loss conditions verify that the proposed algorithm is superior to the concealment algorithm embedded in the G.729.

Original languageEnglish
Pages (from-to)116-119
Number of pages4
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Publication statusPublished - 2003
Event2003 IEEE International Conference on Accoustics, Speech, and Signal Processing - Hong Kong, Hong Kong
Duration: 2003 Apr 62003 Apr 10

All Science Journal Classification (ASJC) codes

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering


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