| 基于小波变换的第一心音频率检测 |
| |
| 引用本文： | 胡晓,王威廉. 基于小波变换的第一心音频率检测[J]. 生物医学工程学杂志, 2003, 20(3): 491-493 |
| |
| 作者姓名： | 胡晓 王威廉 |
| |
| 作者单位： | 云南大学,信息学院,昆明,650091 |
| |
| 基金项目： | 云南省自然科学基金资助项目 (2 0 0 1C0 0 0 4M)，云南省创新人才培养基金 (信息技术与工程 )资助 |
| |
| 摘 要： | 根据心脏瓣膜收缩原理，第一心音(S1)是在心脏收缩期由二尖瓣和三尖瓣关闭时引起的振动产生的，含有多个频率分量。本文介绍一种利用小波变换的多分辨分析原理确定S1频率范围的方法。首先将S1按频率分解成不同的层，然后计算各层的规一化香农能量，具有最大规一化香农能量的层，即为S1的主要成分集中层。该层的频率范围就是S1的主要频率范围。这一方法成功地确定出了S1的频率范围。
|
| 关 键 词： | 小波变换 第一心音 频率 检测 心脏收缩期 诊断 心脏疾病 |
Frequency Detection of the First Heart Sound Based on Wavelet Transformation |
| |
| Hu Xiao Wang Weilian. Frequency Detection of the First Heart Sound Based on Wavelet Transformation[J]. Journal of biomedical engineering, 2003, 20(3): 491-493 |
| |
| Authors: | Hu Xiao Wang Weilian |
| |
| Affiliation: | Information School, Yunnan University, Kunming 650091. |
| |
| Abstract: | According to the valvular theory, the vibrations affected by the mitral and tricuspid valves closure in early systole produce the first heart sound (S 1). S 1 usually includes many frequency components. In this paper, a method using the multi-resolution analysis of wavelet transformation is recommended for detecting the frequency range of S 1. First, S 1 was decomposed into different levels on frequency. Then the normalized Shannon energy of the different levels was calculated. The level containing the maximum energy is the major components' level of S 1. The frequency range of this level is the major frequency range of S 1. The frequency range of S 1 was successfully detected by the method. |
| |
| Keywords: | The first heart sound Wavelet transformations Multi-resolution analysis Frequency detection |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
