基于经验模态分解融合快速傅里叶变换的脉搏信号频域特征分析  

Frequency Domain Feature Analysis of Pulse Signal Based on Empirical Mode Decomposition and FFT

作　　者：唐晓静 赵静 TANG Xiao-jing;ZHAO Jing(College of Science,Ningxia Medical University,Ningxia Yinchuan 750001;School of Information Engineering,Ningxia University,Ningxia Yinchuan 750001)

机构地区：[1]宁夏医科大学理学院,宁夏银川750001 [2]宁夏大学信息工程学院,宁夏银川750001

出　　处：《中国医疗器械信息》2023年第17期59-62,共4页China Medical Device Information

基　　金：宁夏医科大学科学研究基金(基于HHT变换的脉搏波分析及其心血管疾病诊断方法研究,项目编号:XM8008);宁夏自然科学基金(基于多模态生理信号特征的COPD智能辅助诊断关键技术研究,项目编号:2022AAC03006)。

摘　　要：糖尿病已经成为危害健康的重要因素之一。针对现有糖尿病患者无损检测中存在的不足,提出了一种基于经验模态分解融合快速傅里叶变换的脉搏特征分析算法。算法利用经验模态分解算法的自适应特点,将具有非线性非稳态特征的脉搏波信号进行经验模态分解重构,消除背景噪声对脉搏波的影响。然后,采用快速傅里叶变换对信号进行频域特征分析。实验结果表明:光学体积描记术信号的基频最大值偏移了12.5%,而且峰值也增加了63.64%;二次谐波向右偏移了26.67%,数值增加了16.28%。42名志愿者的统计分析也证实,糖尿病患者的光学体积描记术信号与健康人相比,基频的峰值会明显高于健康人群,且峰值所在频率也明显高于健康人群。因此,该算法得到的频域特征可以应用在糖尿病患者早期辅助诊断中,具有重要的应用价值。Diabetes has become one of the important factors endangering health.In order to solve the problem of the existing nondestructive testing with diabetes patients,a pulse feature analysis algorithm based on empirical mode decomposition and fast Fourier transform is proposed.the adaptive characteristics of empirical model decomposition algorithm was used to eliminate the influence of background noise on pulse wave through decompose and reconstruct the pulse wave signal with nonlinear and unsteady characteristics by EMD.Then,FFT is used to analyze the frequency domain characteristics of the signal.The experimental results show that,the maximum fundamental frequency of PPG signal shifts by 12.5%,and the peak value also increases by 63.64%;The second harmonic shifted to the right by 26.67%,and the value increased by 16.28%.The statistical analysis of 42 volunteers also confirmed that the peak value of the fundamental frequency of PPG signal in patients with diabetes was significantly higher than that in healthy people,and the frequency of the peak value was also significantly higher than that in healthy people.The algorithm can be applied to the early auxiliary diagnosis of diabetes patients,which has important application value.

关 键 词：糖尿病 经验模态分解 快速傅里叶变换 心血管疾病 

分 类 号：R319[医药卫生—基础医学]