摘要
目的提取心音信号的包络特征,根据包络对信号进行时域分析。方法本文提出了利用希尔伯特-黄变换对心音信号进行包络提取的方法。首先利用黄变换对心音信号进行预处理;然后对处理后的信号进行希尔伯特变换得到心音信号的包络。结果突出了心音信号的第一心音和第二心音,准确提取了心音的各种时域特征。结论采用此方法能够准确地提取心音信号的包络,为进行下一步分析奠定了基础。
Objective Based on the analysis of time domain of heart sound with envelop to extract the envelope character of heart sounds. Methods The envelope extraction of heart sounds based on Hilbert-Huang Transform was given. Firstly, the original heart sounds signal was preprocessed by Huang Transform. Secondly, the envelope of heart sounds was got with Hilbert Transform. Results The first heart sound and the second heart sound were extracted, and all kinds of characters in time domain of heart sound were acquired more accurately. Conclusion The envelope of heart sound is extracted correctly. The foundation for further analysis of heart sounds is established.
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2008年第2期134-136,共3页
Space Medicine & Medical Engineering
关键词
心音
经验模式分解
固有模态函数
希尔伯特-黄变换
包络提取
heart sound
empirical mode decomposition
intrinsic mode function
Hilbert-Huang transform
envelope extraction
