| 基于增强保护帧的G.722.2丢帧补偿算法 |
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| 引用本文： | 王仕奎,李拟珺,吴镇扬.基于增强保护帧的G.722.2丢帧补偿算法[J].中国科学技术大学学报,2011,41(4). |
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| 作者姓名： | 王仕奎 李拟珺 吴镇扬 |
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| 作者单位： | 1. 东南大学信息科学与工程学院,江苏南京210096;安徽师范大学物理与电子信息学院,安徽芜湖241000
2. 东南大学信息科学与工程学院,江苏南京,210096 |
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| 摘 要： | 运用基于离散Teager能量算子的浊音端点检测技术,将浊音端点及其之后的若干帧作为丢帧补偿的增强保护帧.在研究窄带语音帧间独立编码算法iLBC的基础上,对G.722.2编码标准进行改造,使之能够对宽带输入语音进行类似的帧间独立编码,以增强其抗丢帧鲁棒性.针对不同的丢帧率,对不同数目的增强保护帧进行帧间独立编码,以编码速率的略微提高增强对丢帧的鲁棒性,因此本算法既有iLBC的鲁棒性,又有一般CELP编码的速率自适应性.实验结果表明,相对于G.722.2编码标准附件Ⅰ补偿方法,本算法可以提高丢帧补偿性能,在浊音端点丢失率较高的情况下的效果更好.
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| 关 键 词： | 浊音端点 离散Teager能量算子 帧间独立编码 丢帧补偿 |
Frame error concealment based on enhanced protection frames in G.722.2 |
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| WANG Shikui,LI Nijun,WU Zhenyang.Frame error concealment based on enhanced protection frames in G.722.2[J].Journal of University of Science and Technology of China,2011,41(4). |
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| Authors: | WANG Shikui LI Nijun WU Zhenyang |
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| Institution: | WANG Shikui1,2,LI Nijun1,WU Zhenyang1(1.School of Information Science and Engineering,Southeast University,Nanjing 210096,China,2.School of Physics and Electronic Information,Anhui Normal University,Wuhu 241000,China) |
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| Abstract: | The detection technique for voiced onset based on discrete Teager energy operator was presented,then,the voiced onset and some frames following it were encoded specially as the enhanced protection frames.Based on the research of iLBC with frame-independent coding for narrow-band speech,G.722.2 was modified to code frame-independently for wideband speech to improve its robustness against frame error.According to different frame error rates,enhanced protection frames of different numbers were encoded frame-in... |
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| Keywords: | voiced onset discrete Teager energy operator frame-independent coding frame error concealment |
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