| 基于局部余弦变换的2.4 kb/s低比特率语音编码 |
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| 引用本文： | 董恩清,汪一鸣,李宏亮,侯兴松,刘贵忠.基于局部余弦变换的2.4 kb/s低比特率语音编码[J].西安交通大学学报,2003,37(4):388-391. |
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| 作者姓名： | 董恩清 汪一鸣 李宏亮 侯兴松 刘贵忠 |
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| 作者单位： | 1. 苏州大学电子信息学院,215021,苏州
2. 西安交通大学电子与信息工程学院 |
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| 基金项目： | 国家自然科学基金资助项目 (60 172 0 16) |
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| 摘 要： | 系统地设计了一个基于局部余弦变换的2.4kb/s低比特率的语音编码器，对局部余弦变换系数采用分维矢量量化方法进行量化，码书设计采用LGB算法。编码中的码书搜索采用树形状快速搜索算法。通过主观非正式听力测试和客观参数评价，从理解性和自然度两方面来看，用设计的2.4kb/s低比特率的编码方法编码的语音质量比FS1015（LPC－10e)编码标准编码的语音质量要好，而且具有较强的鲁棒性，适合于对各种环境中的语音进行编码。
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| 关 键 词： | 局部余弦变换 语音编码 低比特率 变换编码 矢量量化 |
| 文章编号： | 0253-987X(2003)04-0388-04 |
| 修稿时间： | 2002年9月19日 |
2.4 kb/s Low Bit Rate Speech Coding Based on Local Cosine Transform |
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| Dong Enqing ,Wang Yiming ,Li Hongliang ,Hou Xingsong ,Liu Guizhong.2.4 kb/s Low Bit Rate Speech Coding Based on Local Cosine Transform[J].Journal of Xi'an Jiaotong University,2003,37(4):388-391. |
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| Authors: | Dong Enqing Wang Yiming Li Hongliang Hou Xingsong Liu Guizhong |
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| Affiliation: | Dong Enqing 1,Wang Yiming 1,Li Hongliang 2,Hou Xingsong 2,Liu Guizhong 2 |
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| Abstract: | A 2 4 kb/s low bit rate speech coder based on local cosine transform(LCT) algorithm is designed. Four segment vector quantizers of the local cosine transform coefficients are employed,and Linde Gray Buzol (LGB )algorithm is applied to design the codebooks. A tree fast search technique is used to select the vector of the local cosine transform coefficients for each splitted vector. The evaluation using subject informal listening tests and a few object parameters indicates that the reconstructed speech quality of the designed 2 4 kb/s low bit rate speech coder is better than that of the FS1015 standard coder in intelligibility and naturalness. The new coder has higher robustness than the FS1015 standard coder, which is suitable for speech coding in various any environments. |
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| Keywords: | local cosine transform speech coding low bit rate transform coding vector quantization |
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