| 无线衰落信道中多级编码AMR—WB的性能研究 |
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| 引用本文： | 刘伟,张建政,傅江涛.无线衰落信道中多级编码AMR—WB的性能研究[J].通信技术,2009,42(10):4-6. |
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| 作者姓名： | 刘伟 张建政 傅江涛 |
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| 作者单位： | 河南科技大学电子信息工程学院,河南,洛阳,471003 |
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| 摘 要： | 根据AMR—WB语音编码数据帧的分类准则，提出一种利用多级编码调制改善Rayleigh衰落信道中AMR—WB重建语音质量的方法。在这种方法中，根据多级编码中不同分量码提供的不等差错保护能力，对AMR—WB语音数据帧中重要A类数据提供强的差错保护能力，而对不重要的B类和C类数据提供弱的差错保护能力。通过重建语音的质量感觉评价对比，多级编码方案可以有效改善无线衰落信道AMR—WB重建语音质量，这种性能改善在低速率编码模式下更加明显。
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| 关 键 词： | 语音信号处理 宽带自适应多速率语音编码 多级编码 语音重建 质量感觉评价 |
Study on Performance of Multilevel Coded AMR-WB over Wireless Fading Channel |
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| LIU Wei,ZHANG Jian-zheng,FU Jiang-tao.Study on Performance of Multilevel Coded AMR-WB over Wireless Fading Channel[J].Communications Technology,2009,42(10):4-6. |
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| Authors: | LIU Wei ZHANG Jian-zheng FU Jiang-tao |
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| Affiliation: | (School of Electronic Information Engineering, Henan University of Science and Technology, Luoyang Henan 471003, China) |
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| Abstract: | According to the different important classes of AMR-WB voice coded data frame, a transmission method of multi-level coded AMR-WB voice data over Rayleigh fading channel is proposed. The unequal error protection capability in multi-level coding is used to improve the quality of reconstructed voice. The multi-level coding is used to realize the high protection capability for the class A data and the low protection capability for the class B and class C data in AMR-WB data frame. The perceptual quality of reconstructed AMR-WB voice over fading channel could be improved by multi level coding. The quality improvement of the reconstructed voice is more remarkable for low rate coding. |
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| Keywords: | audio signal processing AMR-WB multi-level coding voice reconstruction PESQ |
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