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Burst packet loss concealment using multiple codebooks and comfort noise for CELP-type speech coders in wireless
Nam In Park1, Hong Kook Kim, Min A Jung
1School of Information and Communications, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea. naminpark@gist.ac.kr
Sensors (Basel, Switzerland)
|December 14, 2011
Summary
This study introduces a new packet loss concealment (PLC) algorithm for G.729 speech coders. The enhanced method improves speech quality during burst packet loss, especially for voice onset signals in wireless networks.
Area of Science:
- Speech processing
- Telecommunications
- Signal processing
Background:
- Conventional G.729 packet loss concealment (PLC) struggles with burst packet loss due to reliance on previous frame parameters, particularly for voice onset.
- Existing methods fail to effectively reconstruct speech during voice onset intervals because parameters often relate to silence.
Purpose of the Study:
- To propose an improved PLC algorithm for CELP-type speech coders, specifically G.729.
- To enhance decoded speech quality under burst packet loss conditions in wireless sensor networks.
- To address limitations in reconstructing voice onset signals.
Main Methods:
- Developed a novel multiple codebook approach for PLC, incorporating a traditional adaptive codebook and a new random codebook with comfort noise.
- Integrated the proposed PLC algorithm into the G.729 speech codec.
- Evaluated performance using perceptual evaluation of speech quality, waveform comparison, and preference tests under various packet loss scenarios.
Main Results:
- The proposed PLC algorithm demonstrated significantly better speech quality compared to the standard G.729 PLC.
- Improvements were observed across all tested conditions, including random and burst packet loss.
- The new approach effectively reconstructs speech signals, particularly during voice onset intervals.
Conclusions:
- The proposed multiple codebook-based PLC algorithm offers a substantial improvement over existing methods for G.729.
- This advancement is crucial for maintaining speech intelligibility in wireless communication systems experiencing packet loss.
- The algorithm effectively handles challenging scenarios like voice onset reconstruction.
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