| 基于特征波形内插与频带扩展技术的低速率宽带语音编码器 |
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| 引用本文： | 王晶,匡镜明,谢湘.基于特征波形内插与频带扩展技术的低速率宽带语音编码器[J].北京理工大学学报,2007,27(2):166-170. |
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| 作者姓名： | 王晶 匡镜明 谢湘 |
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| 作者单位： | 北京理工大学,信息科学技术学院电子工程系,北京,100081 |
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| 摘 要： | 考察了特征波形内插(CWI)算法对于宽带语音编码的扩展能力.分析宽带特征波序列的性质表明,直接使用传统的特征波形内插算法并不适于增强宽带语音的编码效率及对计算复杂度的兼顾,可引入频带扩展(BWE)技术单独处理高频段.宽带语音的高、低频分别由特征波形内插编码和频带扩展算法恢复,由此形成了5.15 kbit/s的低速率宽带语音编码器,增强了语音真实感、辅音的辨析度及对话者的识别度,宽带语音编码质量接近AMR-WB的6.6 kbit/s结果.
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| 关 键 词： | 特征波形内插 频带扩展 宽带语音编码 特征波形内插算法 频带扩展技术 低速率 宽带语音编码 语音编码器 Techniques Based Speech Coder Wideband 结果 编码质量 识别 对话者 辅音 恢复 扩展算法 频分 频段 单独处理 计算复杂度 |
| 文章编号： | 1001-0645(2007)02-0166-05 |
| 收稿时间： | 2006/6/29 0:00:00 |
| 修稿时间： | 06 29 2006 12:00AM |
Low Bit Rate Wideband Speech Coder Based on CWI and BWE Techniques |
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| WANG Jing,KUANG Jing-ming and XIE Xiang.Low Bit Rate Wideband Speech Coder Based on CWI and BWE Techniques[J].Journal of Beijing Institute of Technology(Natural Science Edition),2007,27(2):166-170. |
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| Authors: | WANG Jing KUANG Jing-ming and XIE Xiang |
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| Institution: | Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | The paper investigates the capability of extension of characteristic waveform interpolation(CWI) algorithm to wideband speech coding.The analysis of wideband characteristic waveform sequences shows that using classical CWI algorithm directly is not suitable for enhancing the wideband coding efficiency and affects the computational complexity.The paper introduces bandwidth expansion(BWE) technique to process the high frequency band.High and low frequency bands were recovered separately by CWI and BWE algorithms.The final 5.15?kbit/s low bit rate wideband coder can enhance the trueness of speech,the discriminability of consonants and the recognizability of the speaker.The coding result is close to that of AMR-WB 6.6?kbit/s. |
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| Keywords: | characteristic waveform interpolation bandwidth expansion wideband speech coding |
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