作者：杨录1, 王慧敏2, 梁星雨2
作者单位：1. 中北大学 电子测试技术国家重点实验室, 山西 太原 030051;
2. 中北大学信息与通信工程学院, 山西 太原 030051
关键词：倒谱;EMD;过零点检测;盐敏感性高血压;心率
摘要：
为从盐敏大鼠血压信号中快速准确地提取出血压、心率等生理特征信息，采用经验模态分解（EMD）、倒谱、过零点检测结合的方法对PhysioNet数据库中的达尔盐敏大鼠的血压信号进行特征参数提取，可以获得平均血压、心率及动态血压、瞬时心率曲线。首先利用EMD将血压信号分解为有限个固有模态函数(IMF)，根据不同的研究目的，用不同的IMF分量重构信号。可以得到动态血压及平均血压。然后对血压信号求倒谱得到平均心率，最后利用过零点检测得到瞬时心率的变化。仿真结果表明：基于倒谱、EMD和过零点检测的血压信号特征提取方法具有运算量小、特征值明显且精确的优点；在高低盐饮食下，得到大鼠血压、心率的变化与医学分析完全吻合。
Extraction method of blood pressure signal in salt-sensitive rats based on cepstrum and empirical mode decomposition
YANG Lu1, WANG Huimin2, LIANG Xingyu2
1. National Key laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China;
2. School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
Abstract: In order to extract the physiological characteristics such as blood pressure and heart rate from the blood pressure signal quickly and accurately, a combination of empirical mode decomposition (EMD), cepstrum, and zero-crossing detection method was proposed. Average blood pressure, heart rate, ambulatory blood pressure, and instantaneous heart rate can be obtained from the blood pressure signal by using this method. The blood pressure signal of Dahl salt-sensitive rats was from the PhysioNet database. First, the blood pressure signal was decomposed into finite intrinsic mode functions (IMF) by EMD. According to different research purpose, the signal was reconstructed using different IMF, and the ambulatory blood pressure and average blood pressure were obtained. Then, the average heart rate was obtained by cepstrum analysis, and the instantaneous heart rate were obtained by zero-crossing detection. The simulation result shows that the integrated signal processing method has higher localization accuracy and smaller computation. And on the high and low salt diet, the changes of blood pressure and heart rate in rats extracted by this method are consistent with the medical research.
Keywords: cepstrum;EMD;zero-crossing detection;salt-sensitive hypertension;heart rate
2020, 46(6):61-66 收稿日期: 2020-02-23;收到修改稿日期: 2020-03-18
基金项目:
作者简介: 杨录(1968-),男,山西阳高市人,副教授,研究方向为信息与信号处理;王慧敏(1998-),女,山西太原市人,专业方向为信号与信息处理
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