Loss Concealment for Low -Bit -Rate Packet Voice

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Electrical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Lin, Dong

Contributors dc:contributor

• Wah, Benjamin W.

• Engineering, Electronics and Electrical

Language dc:language

eng

Identifier

(MiAaPQ)AAI3070371

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/80798