| 基于离散余弦变换的波形内插语音编码算法 |
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| 引用本文： | 刘靖宇,鲍长春,李如玮.基于离散余弦变换的波形内插语音编码算法[J].电子学报,2009,37(7):1599-1605. |
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| 作者姓名： | 刘靖宇 鲍长春 李如玮 |
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| 作者单位： | 北京工业大学电子信息与控制工程学院语音与音频信号处理研究室,北京,100124 |
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| 基金项目： | 北京市教委科技发展项目(No.KM200710005001);;国家自然科学基金(No.60372063);;北京市自然科学基金(No.4042009) |
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| 摘 要： | 针对波形内插(Waveform Interpolation,WI)语音编码的特征波形分解问题,本文首先提出了基于离散余弦变换(Discrete Cosine Transform,DCT)的特征波形分解方法,避免了复杂的特征波形对齐运算;其次,针对WI的相位重建问题,提出了清/浊音相位判决和浊音相位分类的方法,提高了重建语音质量;最后,分别构建了速率为2.0kbps和1.6kbps的DCT-WI声码器.主观MOS分表明,2.0kbps的DCT-WI声码器质量优于2.4kbps MELP声码器,1.6kbps的DCT-WI声码器亦取得了良好的听觉效果.
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| 关 键 词： | 语音编码 波形内插 特征波形 离散余弦变换 特征波形对齐 相位重建 |
| 收稿时间： | 2008-05-05 |
Waveform Interpolation Speech Coding Based on DCT |
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| LIU Jing-yu,BAO Chang-chun,LI Ru-wei.Waveform Interpolation Speech Coding Based on DCT[J].Acta Electronica Sinica,2009,37(7):1599-1605. |
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| Authors: | LIU Jing-yu BAO Chang-chun LI Ru-wei |
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| Affiliation: | Speech and Audio Signal Processing Laboratory;School of Electronic Information and Control Engineering;Beijing University of Technology;Beijing 100124;China |
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| Abstract: | Characteristic waveform(CW) decomposition based on discrete cosine transform(DCT) is proposed firstly in waveform interpolation(WI) speech coding.The complicated CW alignment operation is cancelled by using this method.Secondly,a new unvoiced/voiced phase decision method and the classification method of voiced phase are proposed with respect to phase reconstruction.Finally,DCT-WI coders at 2.0kbps and 1.6kbps are designed,respectively.The subjective MOS test results indicate that the 2.0kbps DCT-WI coder ou... |
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| Keywords: | speech coding waveform interpolation characteristic waveform discrete cosine transform alignment of characteristic waveform phase reconstruction |
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