A very low bit rate algorithm for encoding speech signals at 825 bps based on a mixed harmonic and stochastic modeling of the excitation signal is presented. The algorithm is more robust in the V/UV decision, reliable...A very low bit rate algorithm for encoding speech signals at 825 bps based on a mixed harmonic and stochastic modeling of the excitation signal is presented. The algorithm is more robust in the V/UV decision, reliable pitch estimation, and excitation signals synthesis. The bit allocation schedules in every case and the analysis-by-synthesis processes of the parameters are also described. The Diagnostic Rhyme Test (DRT) results show that the performance of the proposed algorithm is comparable to that of the MELP algorithm at 2.4 kbps, and the speech distinctness is 90.25%.展开更多
基于ARM926EJ-S平台,给出了MELP增强算法(Mixed-excitation linear predictive enhanced,MELPe)的优化步骤:算法结构优化、代码优化以及汇编优化。优化后,算法复杂度从原来的516.6MIPS下降至62.4MIPS,减小为原来的12.08%。PESQ系统测评...基于ARM926EJ-S平台,给出了MELP增强算法(Mixed-excitation linear predictive enhanced,MELPe)的优化步骤:算法结构优化、代码优化以及汇编优化。优化后,算法复杂度从原来的516.6MIPS下降至62.4MIPS,减小为原来的12.08%。PESQ系统测评显示,优化前后的语音质量不变。实验结果表明优化后的算法符合实时处理的要求。展开更多
文摘A very low bit rate algorithm for encoding speech signals at 825 bps based on a mixed harmonic and stochastic modeling of the excitation signal is presented. The algorithm is more robust in the V/UV decision, reliable pitch estimation, and excitation signals synthesis. The bit allocation schedules in every case and the analysis-by-synthesis processes of the parameters are also described. The Diagnostic Rhyme Test (DRT) results show that the performance of the proposed algorithm is comparable to that of the MELP algorithm at 2.4 kbps, and the speech distinctness is 90.25%.
文摘基于ARM926EJ-S平台,给出了MELP增强算法(Mixed-excitation linear predictive enhanced,MELPe)的优化步骤:算法结构优化、代码优化以及汇编优化。优化后,算法复杂度从原来的516.6MIPS下降至62.4MIPS,减小为原来的12.08%。PESQ系统测评显示,优化前后的语音质量不变。实验结果表明优化后的算法符合实时处理的要求。
