基于鉴相器的手机瞬时心率监测软件设计  

Software Design of Instantaneous Heart Rate Detection Based on Phase Demodulator for Smart Phones

作　　者：李晗[1] 赵海[1] 陈星池 李大舟[1] 

机构地区：[1]东北大学计算机科学与工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2016年第2期174-178,共5页Journal of Northeastern University(Natural Science)

基　　金：中央高校基本科研业务费专项资金资助项目(N100304002)

摘　　要：目前用手机摄像头监测心率的手机软件无法检测瞬时心率,因为手机上资源有限,而占用资源较少的主要检测方法差分阈值法需要根据一段时间的结果来设定阈值才能准确检测出心率,不适于瞬时心率的检测.针对以上问题提出了一种基于鉴相器的瞬时心率检测算法,通过手机摄像头检测出的脉搏波信号先与正弦参考信号相乘,再经过低通滤波器提取心率成分,根据相位的变化逐拍检测心率的变化.在Android智能手机上的实验结果表明,与ECG方法相比,计算精度能满足要求.与差分阈值法和滤波器组法相比,本文提出的方法能较快地检测出瞬时心率.Rarely software in the smart phone market can detect instantaneous heart rate quickly and precisely, because a threshold calculated based on a period of measurement is always necessary when using a derivative based algorithm. A phase demodulator based method was proposed to improve the performance of Android software. The pulse wave detected by cell phone camera was multiplied by a sine wave reference signal and then processed by a lowpass filter to extract phase. The phase could be used to calculate the frequency beat to beat. Experimental results on an Android smart phone indicated that there was no obvious difference of instantaneous heart rate between the newmethod and the ECG method. Compared with derivative based and filter bank based algorithms, less phone resources was needed for the newalgorithm and instantaneous heart rate could be obtained more quickly.

关 键 词：脉搏波监测 摄像头 安卓智能手机 瞬时心率 鉴相器 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]