| 基于DCT变换的LSF参数降维算法 |
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| 引用本文： | XIANG Bo,唐昆,CUI Hui-juan,魏旋,DANG Xiao-yan.基于DCT变换的LSF参数降维算法[J].通信技术,2008,41(8). |
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| 作者姓名： | XIANG Bo 唐昆 CUI Hui-juan 魏旋 DANG Xiao-yan |
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| 作者单位： | 清华大学,电子工程系,微波与数字通信技术国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 为降低声码器线谱对频率(LSF)参数量化码本的存储量和码本搜索运算量,文章提出了一种基于二维DCT变换的LSF参数降维算法.相比时域重要帧抽取算法,DCT降维算法能够在不降低语音听觉性能的基础上,将LSF参数的码本量和搜索运算量都降到50%.在同等情况下,DCT降维算法能比时域重要帧抽取算法提高0.1dB到0.2dB的性能.实验结果表明,提出的算法可以更有效地解决低速率声码器中参数码本存储量和搜索运算量的问题.
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| 关 键 词： | 语音编码 DCT变换 降维算法 线谱对频率 |
DCT based Algorithm on Dimension Reduction of LSF Parameters |
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| XIANG Bo,TANG Kun,CUI Hui-juan,WEI Xuan,DANG Xiao-yan.DCT based Algorithm on Dimension Reduction of LSF Parameters[J].Communications Technology,2008,41(8). |
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| Authors: | XIANG Bo TANG Kun CUI Hui-juan WEI Xuan DANG Xiao-yan |
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| Affiliation: | XIANG Bo,TANG Kun,CUI Hui-juan,WEI Xuan,DANG Xiao-yan(State Key Laboratory of Microwave , Digital Communications,Department of Electronic Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | A dimension reduction method of LSF parameters based on DCT is proposed to decrease codebook storage and search complexity of LSF.Compared to the existing method of taking out and transmitting important frames in time domain,DCT based algorithm can decrease codebook storage and search complexity by 50%,without significant decrease of hearing performance.Tests show that average spectral distortion is reduced by about 0.1dB to 0.2dB by using the algorithm in this paper instead of using method of taking out an... |
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| Keywords: | speech coding DCT dimension reduction LSF |
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