Transcoding Scheme on Parameter Layer from AMR to G.729A
Bo Hu · Information and Electronic Engineering · 2005
In this paper,a novel transcoding algorithm for the Adaptive Multi Rate(AMR) and G.729A is proposed.Firstlyt,he key differences between AMR and G.729A codec are analyzed,then the detail parametric domain transcoding procedure of LSP,pitch,and stochastic codebook parameter are described.The LSP transcoding algorithm’s performance is evaluated with Mean Square Error(MSE),and PESQ algorithm is used in the voice quality evaluation.In contrast to the conventional tandem transcoding algorithm,the proposed algorithm transcodes the parameters of the source codec to the other without parameter’s analysis procedure.Evaluation results show that while reducing the computational complexity by about 25%~64%,the proposed algorithm improves speech quality by about 0.1 PESQ MOS.All these performance indicates the proposed algorithm is much better than Tandem transcoding algorithm.