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LMS adaptive filtering PPG signal heart rate extraction method

An adaptive filter, adaptive filter technology, applied in the measurement of pulse rate/heart rate, application, medical science, etc., can solve problems such as unsatisfactory results, achieve high accuracy, improve accuracy, and improve effectiveness

Inactive Publication Date: 2019-08-27
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

The above method works well when the exercise intensity is not large. However, the effect is not ideal when the exercise interference is strong and there is a sudden change in the waveform. There is still room for improvement in the algorithm.

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  • LMS adaptive filtering PPG signal heart rate extraction method
  • LMS adaptive filtering PPG signal heart rate extraction method
  • LMS adaptive filtering PPG signal heart rate extraction method

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Embodiment Construction

[0036] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0037] A kind of LMS adaptive filtering PPG signal heart rate extraction method provided by the invention comprises the following steps:

[0038] (1) Use the normal range of human heart rate to construct a band-pass filter, filter the original PPG signal through the band-pass filter to remove out-of-band noise outside the normal range of human heart rate, and obtain the preprocessed signal D.

[0039] The original PPG signal i...

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Abstract

The invention relates to a cascaded LMS adaptive filtering PPG signal heart rate extraction method, comprising the following steps: filtering an original PPG signal through a band pass filter to remove out-of-band noise outside a normal range of a human heart rate value, to obtain a pre-processed signal D; when a heart rate sensor collects a signal, synchronously acquiring XYZ triaxial acceleration data by using a three-axis acceleration sensor, respectively constructing reference signals of an LMS adaptive filter by using the XYZ triaxial acceleration data, cascading into a three-channel cascaded LMS adaptive filter, wherein the pre-processed signal is used as an input of the filter to obtain filter response Y; calculating a PPG heart rate value by using a spectral peak tracing heart ratealgorithm, and optimizing by a three-point moving average algorithm and a limit formula to obtain a heart rate value corresponding to the PPG signal. The method can extract a heart rate of the PPG signal against motion artifacts and improve the calculation accuracy of the heart rate value of the PPG signal.

Description

technical field [0001] The invention relates to a method for extracting heart rate of PPG signals, in particular to a method for extracting heart rate of PPG signals with LMS self-adaptive filtering, and belongs to the technical field of heart rate detection. Background technique [0002] Heart rate is a very important physiological parameter. Monitoring heart rate around the clock can help people keep abreast of their health status. At present, a heart rate signal acquisition method commonly used in wearable devices is photoplethysmography (photoplethysmography, PPG). Sensors integrated with the PPG heart rate acquisition method have been applied to wearable devices, such as the MAX30102 heart rate sensor produced by Maxim. However, the PPG pulse wave signal collected by this method is mixed with motion noise, and the accurate heart rate value needs to be filtered out of the signal artifacts caused by the motion process. [0003] Aiming at the motion artifacts in the PPG ...

Claims

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Application Information

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IPC IPC(8): A61B5/024
CPCA61B5/02416A61B5/7207A61B5/725
Inventor 付光明穆平安戴曙光蒋睿杰
Owner UNIV OF SHANGHAI FOR SCI & TECH
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