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Wrist heart rate monitoring method of sports bracelet

A sports wristband and heart rate monitoring technology, which is applied in the fields of pulse rate/heart rate measurement, diagnostic recording/measurement, medical science, etc., can solve problems such as large error in heart rate estimation, imperfect judgment strategy of heart rate peak value caused by motion artifacts, etc., and achieve improvement The effects of accuracy, noise reduction, and improved estimation accuracy

Inactive Publication Date: 2017-05-24
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, the heart rate estimation error of most wrist monitoring devices is relatively large, mainly due to the introduction of motion artifacts and the imperfection of the heart rate peak judgment strategy

Method used

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  • Wrist heart rate monitoring method of sports bracelet
  • Wrist heart rate monitoring method of sports bracelet
  • Wrist heart rate monitoring method of sports bracelet

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Embodiment Construction

[0026] Step (1): at first the PPG original signal that gathers is input into band-pass filter (BPF), carries out threshold value processing. This method adopts a band-pass filter of 0.4-5 Hz, on the one hand to remove the non-heart rate frequency band signal as much as possible, and on the other hand to consider the occurrence of abnormal heart rate of the human body. This operation can remove motion artifacts and other irrelevant noise to a certain extent. The obtained two-way PPG signal is denoted as S PPG1 , S PPG2 .

[0027] In step (2), the reference MA signal is generated by decomposing the three-axis acceleration through singular spectrum analysis. It specifically includes five steps of embedding, singular value decomposition, grouping, normalization processing, and heart rate-related spectrum removal, as follows:

[0028] Step (2.1), the acceleration data of each dimension can be regarded as a time-related sequence where each component y i , i∈(1,M) is the compo...

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Abstract

The invention discloses a wrist heart rate monitoring method of a sports bracelet. The method comprises the steps that firstly, threshold processing is conducted on an original optical pulse wave signal, and signals not relevant to the heart rate are eliminated; then, a synchronous acceleration signal is processed through a singular spectrum analysis method, and an motion artifact reference signal is obtained; the motion artifact signal and a preprocessing optical signal are subjected to self-adaption filtering processing, motion artifact components in the optical signal are eliminated, and a pure pulse wave signal is obtained; the pure pulse wave signal is processed through a self-adaption threshold iteration method, and the frequency spectrum precision is improved; finally, sufficiency analysis is conducted on situations possibly occurring in peak value selection of a pulse wave frequency spectrum, and then the pulse wave peak value is determined. By accurately determining the peak value and elapsed time, the heart rate value of current time can be calculated. By means of the method, interference of motion artifact to the optical pulse wave signal can be effectively reduced, and then the precision of heart rate estimation is improved.

Description

technical field [0001] The invention relates to the technical field of wearable devices, in particular to a method for eliminating motion artifacts and calculating heart rate values ​​of a wrist heart rate monitoring device. Background technique [0002] With the improvement of living standards and the development of the mobile Internet, people pay more and more attention to health, and national sports have become a trend. As a common physical sign, heart rate has important research value in clinical medicine and sports science. At the same time, the development of wearable devices has made it possible for people to measure the human heart rate in real time during exercise. At present, more and more wearable devices have heart rate measurement function. However, there is a large error between the heart rate data calculated by most products during exercise and the actual value. How to measure high-precision heart rate values ​​during strenuous exercise has also become a hot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/024
CPCA61B5/024A61B5/02438A61B5/721
Inventor 黎海涛马银童柴一栋
Owner BEIJING UNIV OF TECH
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