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https://hdl.handle.net/2142/80798
Description
Title
Loss Concealment for Low -Bit -Rate Packet Voice
Author(s)
Lin, Dong
Issue Date
2002
Doctoral Committee Chair(s)
Wah, Benjamin W.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
We propose a new coder-dependent parameter-based MDC. Based on the correlations of coding parameters, we generate multiple descriptions systematically. In particular, we have observed high inter-frame correlations in linear predictors of low-bit-rate coders, but low correlations in excitation parameters. Hence, we generate multiple descriptions at the sender side by interleaving linear predictors, and reconstruct lost ones at the receiver side by linear interpolations. In addition, we replicate hard-to-reconstruct, excitation parameters to multiple descriptions. We also require our design to be done in such a way that does not require extra transmission bandwidth and that can adapt its number of descriptions to network-loss conditions dynamically. We have compared three linear predictor representations, Reflection Coefficient, Log Area Ratio, and Line Spectral Pair (LSP), by their reconstruction qualities, and have found that the LSP representation performs the best. Finally, we have studied LSP reconstructions and enhancements on excitation quality. Extensive tests on FS CELP, ITU G.723.1, and FS MELP under different loss scenarios have shown good quality and reliability of our proposed scheme.
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