| 基于改进阈值函数的体震信号平移不变去噪 |
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| 引用本文： | 金晶晶,王旭,吴雪,杨丹.基于改进阈值函数的体震信号平移不变去噪[J].东北大学学报(自然科学版),2009,30(3):333-336. |
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| 作者姓名： | 金晶晶 王旭 吴雪 杨丹 |
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| 作者单位： | 东北大学信息科学与工程学院,辽宁,沈阳,110004 |
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| 摘 要： | 体震信号微弱,受仪器、环境因素等方面的影响,常常含有大量噪声,研究一种基于改进阈值函数的平移不变法用于体震信号的去噪.针对体震信号选择了合适的小波基,说明了小波分解后各尺度上噪声方差的估计方法,分析了所改进阈值函数的性能及特点,并给出了算法的实现步骤.与基于硬、软阈值函数平移不变法的去噪效果比较,基于改进阈值函数平移不变法去噪后的体震信号波形平滑,特征点幅值无衰减.其功率谱密度与原始信号功率谱密度的对比结果表明,基于改进阈值函数的平移不变法能够在去噪的同时更好地保留原始体震信号的特征.
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| 关 键 词： | 体震信号 平移不变去噪 噪声方差 改进阈值函数 功率谱密度 |
Translation-Invariant De-noising of Body Fluttering Signal Based on Improved Threshold Function |
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| JIN Jing-jing,WANG Xu,WU Xue,YANG Dan.Translation-Invariant De-noising of Body Fluttering Signal Based on Improved Threshold Function[J].Journal of Northeastern University(Natural Science),2009,30(3):333-336. |
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| Authors: | JIN Jing-jing WANG Xu WU Xue YANG Dan |
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| Affiliation: | JIN Jing-jing,WANG Xu,WU Xue,YANG Dan(School of Information Science & Engineering,Northeastern University,Shenyang 110004,China.) |
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| Abstract: | Body fluttering signal is weak and often involves a lot of noise arising from instrument and environment.The translation-invariant de-noising method based on improved threshold function was therefore studied to de-noise the body fluttering signal.A proper wavelet base suitable to body fluttering was selected,and the estimate method of noise variance on each and every scale after wavelet decomposition was analyzed.In addition,the capability and characteristics of improved threshold function were analyzed,bas... |
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| Keywords: | body fluttering signal translation-invariant de-noising noise variance improved threshold function power spectral density |
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