| 改进的阈值函数在心音信号消噪中的研究 |
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| 引用本文： | 尹明,刘欣,王燕,张艳,林莉.改进的阈值函数在心音信号消噪中的研究[J].电声技术,2010,34(10):48-53. |
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| 作者姓名： | 尹明 刘欣 王燕 张艳 林莉 |
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| 作者单位： | 1. 解放军95538部队,四川,成都,611431
2. 西华大学电气信息学院,四川省信号与信息处理重点实验室,四川成都610039 |
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| 摘 要： | 为弥补传统阈值函数存在的不足、提高心音信号的消噪精度，提出了3种改进的阈值函数。试验中，首先对传统的软、硬阈值函数及3种改进的阚值函数进行去噪性能对比分析；其次，采用基于小波分析的频带局部能量特征提取法对消噪后的心音信号进行特征提取．并运用模糊Sammon映射算法将六维特征数据映射成二维以显示其散布特性。结果表明，改进的阈值函数二能更有效地消除噪声，其消噪后的心音信号特征向量较全面地反映了心音信号的特征。
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| 关 键 词： | 心音 小波变换 阈值函数 消噪 特征提取 模糊Sammon映射算法 |
Research on Improved Threshold Functions in Noise Reduction of Heart Sounds |
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| YIN Ming,LIU Xin,WANG Yan,ZHANG Yan,LIN Li.Research on Improved Threshold Functions in Noise Reduction of Heart Sounds[J].Audio Engineering,2010,34(10):48-53. |
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| Authors: | YIN Ming LIU Xin WANG Yan ZHANG Yan LIN Li |
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| Affiliation: | YIN Ming1,LIU Xin1,WANG Yan2,ZHANG Yan2,LIN Li2 (1. Unit 95538 of PLA,Chengdu 611431,China,2. Sichuan provincial key laboratory of Signal and Information Processing,Institute of Electrical and Information Engineering,Xihua University,Chengdu 610039,China) |
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| Abstract: | To compensate for the deficiencies of traditional threshold functions and improve the denoising accuracy of the heart sounds (HSs), three improved threshold functions are proposed in this paper. First, the traditional soft and hard threshold functions and the three improved threshold functions were used to do noise reduction for many cases of HSs respectively and their denoising effects were assessed. Second, the feature extraction method based on wavelet transform is applied to extract the features from th... |
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| Keywords: | heart sound wavelet transform threshold functions noise reduction feature extraction fuzzy Sammon mapping algorithm |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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