摘要
针对光电容积脉搏波在低灌注时,脉率测量精度较低的问题,通过分析FFT幅值与相位差特性,提出了一种基于幅值与相位差判据的Rife算法的脉率测量方法。该方法基于Rife算法在相邻频率中心区域鲁棒性较好的特点,采用新的判据对信号进行频移处理,从而获得更高的脉率测量精度。对建立的脉搏波模型进行仿真,结果表明信噪比在-14 dB的条件下,所提方法与I-Rife算法性能相当,相对于Rife算法减少了大约15%的修正方向误判率,且FFT点数在10~3~10~4的数量级条件下,所提方法相对于I-Rife算法减少了25%以上的计算量。同时使用脉搏波信号进行实验,结果表明所提方法具有较高的测量精度与稳定性。该测量方法测量精度更高,为人体脉率测量提供了一种新的思路。
Aiming at the problem of low pulse rate measurement accuracy of photoplethysmography in low perfusion,by analyzing the characteristics of FFT amplitude and phase difference,a pulse rate measurement method based on amplitude and phase difference criterion by using Rife algorithm is proposed.This method is based on the robustness of the Rife algorithm in the adjacent frequency center area,and uses a new criterion to process the frequency shift of the signal,so as to obtain a higher pulse rate measurement accuracy.The established pulse wave model is simulated,and the results show that under the condition of signal-to-noise ratio of-14 dB,the performance of the proposed method is equivalent to that of the I-Rife algorithm,and the correction direction misjudgment rate is reduced by about 15%compared with the Rife algorithm.Under the condition that the number of points is in the order of magnitude,the proposed method reduces the calculation amount by more than 25%compared with the I-Rife algorithm.At the same time,the pulse wave signal is used for experiments,and the results show that the proposed method has high measurement accuracy and stability.The new measurement method has higher measurement accuracy and provides a new way of thinking for the measurement of human pulserate.
作者
李毅
王凤森
吕恒
朱涛
朱佳兵
刘彩彩
LI Yi;WANG Feng-sen;LU Heng;ZHU Tao;ZHU Jia-bing;LIU Cai-cai(Wuhan Zoncare Bio-Medical Electronics Co.Ltd.,Wuhan 430206,China)
出处
《光学与光电技术》
2024年第2期92-99,共8页
Optics & Optoelectronic Technology
关键词
低灌注
脉率测量
FFT幅值
相位差
Rife算法
slow perfusion
pulse rate measurement
FFT amplitude
phase difference
Rife algorithm
