Motion noise detecting method based on photoplethysmography signals

A photoplethysmography and noise detection technology, which is applied in the measurement of pulse rate/heart rate, diagnostic recording/measurement, medical science, etc., to achieve the effect of improving detection accuracy and reducing computational complexity

Inactive Publication Date: 2016-11-23
ZHEJIANG NORMAL UNIVERSITY
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to effectively detect the peak position of the strong motion noise in the photoplethysmography signal, so as to realize the high-precision measurement of heart rate

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  • Motion noise detecting method based on photoplethysmography signals
  • Motion noise detecting method based on photoplethysmography signals
  • Motion noise detecting method based on photoplethysmography signals

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Embodiment 1

[0022] Embodiment 1. Motion noise detection method based on photoplethysmography signal

[0023] FIG. 1 is a schematic flowchart of a motion noise detection method based on a photoplethysmography signal in this embodiment.

[0024] The present embodiment shown in Fig. 1 is the overall process of the motion noise detection method based on the photoplethysmography signal, mainly including the following steps:

[0025] Step S210, using two reflective photoelectric sensors distributed in different positions to collect photoplethysmogram signals of two channels, and then using a motion sensor to collect acceleration signals in three synchronous motion directions;

[0026] Step S220, the preprocessing includes downsampling the original signal to a sampling frequency of 25 Hz and filtering through a second-order Butterworth filter with a passband of 0.4 Hz-4 Hz;

[0027] Step S230, using the principal component analysis method to analyze the preprocessed acceleration signal, and sel...

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Abstract

The invention discloses a motion noise detection method based on a photoplethysmography signal, which lays a foundation for the follow-up work of heart rate measurement. In this method, multiple photoplethysmogram signals and acceleration signals in the same time period are collected by reflective photoelectric sensors and motion sensors; the acceleration signals are processed by principal component analysis to generate reference signals related to motion noise, and combined with The least mean square adaptive filter eliminates part of the motion noise; then multiple photoplethysmography signals and acceleration signals are processed to form a spectrum matrix, and the sparse structural features of the spectrum matrix rows are extracted to construct a sparse signal reconstruction model; finally, the regularization algorithm is used to Optimize the sparse signal reconstruction model to obtain the spectral peak positions of motion noise in the spectrum of multiple photoplethysmography signals. The invention can accurately detect the motion noise in the photoplethysmography signal, and realize the high-precision measurement of the heart rate.

Description

technical field [0001] The invention relates to the field of physiological signal processing, in particular to a motion noise detection method based on a photoplethysmography signal. Background technique [0002] Heart rate measurement, as an objective evaluation index of the physiological load of human exercise, has been widely used in various aspects of fitness and competitive sports training. Although the traditional heart rate measurement technology can achieve high measurement accuracy, there are many restrictions on the measurement conditions. In order to meet the requirements of future electronic health monitoring, heart rate measurement methods based on photoplethysmography signals have attracted great attention from academia and industry. [0003] However, photoplethysmography is a biological signal with weak signal strength and easily interfered by noise. In the state of exercise, due to tissue interference, venous blood volume, and optical path changes, it is ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/024A61B5/02A61B5/11A61B5/00
CPCA61B5/02416A61B5/02A61B5/02438A61B5/1118A61B5/681A61B5/6824A61B5/7207A61B5/7235A61B5/725
Inventor 熊继平蔡丽桑王妃
Owner ZHEJIANG NORMAL UNIVERSITY
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