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Transcoding Algorithm for AMR and EVRC Vocoders Via Direct Parameter Transformation  

Lee, Sun-Il (Dept. of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology)
Yu, Chang-Dong (Dept. of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.39, no.6, 2002 , pp. 696-708 More about this Journal
Abstract
In this paper, a novel transcoding algorithm for the Adaptive Multi Rate(AMR) and the Enhanced Variable Rate Codec(EVRC) vocoders via direct parameter transformation is proposed. In contrast to the conventional tandem transcoding algorithm, the proposed algorithm converts the parameters of one coder to the other without going through the decoding and encoding processes. The proposed algorithm consists of the parameter decoding, frame classification, mode decision, and transcoders for two frame types. The transcoders convert the parameters such as LSP, frame energy, pitch delay for the adaptive codebook, fixed codebook vector, and codebook gains. Evaluation results show that while exhibiting better computational and delay characteristics, the proposed algorithm produces equivalent speech quality to that produced by the tandem transcoding algorithm.
Keywords
AMR; EVRC; transcoding; direct parameter transformation; speech coding;
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Times Cited By KSCI : 1  (Citation Analysis)
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