| 基于信号包络及短时过零率的心音分段算法 |
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| 引用本文： | 陈萌辉,叶大田,陈江天. 基于信号包络及短时过零率的心音分段算法[J]. 北京生物医学工程, 2007, 26(1): 48-51 |
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| 作者姓名： | 陈萌辉 叶大田 陈江天 |
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| 作者单位： | 清华大学生物医学工程系,北京,100084;清华大学深圳研究生院生物医学工程中心,广东深圳,518055;北京大学人民医院心内科,北京,100044 |
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| 摘 要： | 心音能有效地反应心脏尤其是瓣膜活动状况,研究基于心音的心脏病决策系统具有重大意义.心音分段是建立心音决策系统的基础和前提,其目的是定位心音的主要成份,为特征提取与模式识别提供定位基准.本文通过使用双门限、迭代等方法,改进了基于信号能量的分段算法,并首次引人短时过零率以更准确地定位分段边界.实验结果表明,该算法对正常心音及常见异常心音分段效果良好.
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| 关 键 词： | 心音分段算法 香农能量 短时过零率 |
| 文章编号： | 1002-3208（2007）01-0048-04 |
| 收稿时间： | 2005-12-16 |
| 修稿时间： | 2005-12-16 |
Heart sound segmentation algorithm based on shannon energy and short-time zero-crossing rate |
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| CHEN Menghui,YE Datian,CHEN Jiangtian. Heart sound segmentation algorithm based on shannon energy and short-time zero-crossing rate[J]. Beijing Biomedical Engineering, 2007, 26(1): 48-51 |
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| Authors: | CHEN Menghui YE Datian CHEN Jiangtian |
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| Affiliation: | 1 Department of Biomedical Engineering, Tsinghua University, Beijing 100084; 2 Biomedical Engineering centre,Shenzhen Graduate College of Tsinghua Universiry,Shenzhen,Guangdong Province 518055; 3 Renmin Hospital of Beijing University,Beijing 100044 |
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| Abstract: | Heart sound reflects the behavior of hearts, especially their valves, so it is of great significance to develop a support system. The segmentation of heart sound signal is the first step of analysis and the most important procedure in the automatic diagnosis of heart sounds. In this article, double threshold, iteration is applied to improve segmentation algorithm based on signal energy, and Short-time Zero-crossing Rate is proposed for the first time to determine the exact boundaries between different components of heart sound. Experimental results indicte that the algorithm is validated to perform well for normal and typical abnormal heart sounds. |
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| Keywords: | heart sound segmentation shannon energy short-time zero-crossing rate (ST-ZCR) |
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