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In order to achieve robust speech communication under bad channel conditions like underwater acoustic channel, an error control transmission scheme based on UEP is presented. The transmission scheme combines both source coding and channel coding to strengthen the protection of the data transferred through the channel. The method uses block code as the extra protection for source coding, and uses 2/3...
The study proposes a joint source channel decoding scheme with the speech source residual redundancy without changing the complexity of the decoding algorithm. As the speech parameter index could be used to calculate the transition probability of the speech coding parameter index, we can get transition matrixes on different speech parameters according to the statistics of the speech signal. Using...
The MELP is the U.S. Federal Standard operated at 2.4kbps, it could achieve equal to or better than the performance of the 4.8kbps CELP vocoder. However, for channels like underwater acoustic channel, the condition is very bad that even the 2.4kbps MELP data could not be transferred. A new 600 bps quantization method based on the MELP parameters is proposed. The new scheme contains methods like inter-frame...
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