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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 detecting method based on photoplethysmography signals. The method lays a foundation for follow-up work of heart rate measurement. In the method, multiple photoplethysmography signals and acceleration signals within the same period are acquired by a reflecting type photoelectric sensor and a motion sensor; the acceleration signals are processed with a principal component analysis method, a reference signal related with motion noise is produced, and part of motion noise is eliminated in combination with a least mean square adaptive filter; the multiple processed photoplethysmography signals and acceleration signals form a frequency spectrum matrix, sparse structure features of rows of the frequency spectrum matrix are extracted, and a sparse signal reconstruction model is constructed; finally, the sparse signal reconstruction model is optimized with a regularization algorithm, and the spectrum peak position of the motion noise in the frequency spectra of multiple photoplethysmography signals is acquired. The motion noise in the photoplethysmography signals can be detected accurately, and high-accuracy measurement of the heart rate is realized.

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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