An adaptive variable threshold filtering method for photoelectric reflection pulse heart rate sensor

A heart rate sensor and threshold filtering technology, applied in the measurement of pulse rate/heart rate, etc., can solve the problem of low measurement accuracy and achieve the effect of improving stability

Inactive Publication Date: 2018-05-22
天津睿合唯创智能装备科技有限公司
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Problems solved by technology

Therefore, the measurement accuracy of existing algorithms is not high

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  • An adaptive variable threshold filtering method for photoelectric reflection pulse heart rate sensor
  • An adaptive variable threshold filtering method for photoelectric reflection pulse heart rate sensor

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[0035] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0036] Such as figure 1 As shown, the normal pulse wave voltage waveform measured by photoplethysmography is as follows figure 1 As shown in middle 1, but there is a dicrotic wave voltage waveform 2 behind the normal pulse wave voltage waveform 1.

[0037] In order to remove the interference of dicrotic wave voltage waveform 2,

[0038] Algorithm of the present invention: because the amplitude of the dicrotic wave is proportional to the amplitude of the pulse wave that causes it, after measuring the voltage peak value Vi caused by the normal pulse wave at T1 time, a threshold E is set, and the threshold voltage E is the normal pulse wave caused by one-third of the peak voltage Vi. In the next sampling, the sampling value below the threshold is considered to be the interference value caused by the pulse wave, until the sampling value is greater t...

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Abstract

An adaptive variable threshold filtering method for a photoelectric reflective pulse heart rate sensor, which relates to a medical electronic measurement method. Since the amplitude of the dicrotic wave is proportional to the amplitude of the pulse wave that caused it, a normal pulse can be measured at a certain moment After the voltage peak caused by the pulse wave, set a threshold, the threshold voltage is one-third of the voltage peak caused by the normal pulse wave; the sampling value below the threshold is considered to be the interference value caused by the pulse wave, until the sampling value is greater than After the threshold, the sampling value is considered to be a normal pulse wave voltage rising process. When the pulse wave voltage peak appears again, remember this moment; the time difference between the two pulses can be measured by only the difference between the two voltage peak times. Further, the heart rate value is obtained; the present invention can monitor the voltage fluctuation signal caused by the human tissue in real time when the blood vessel is pulsating, and can effectively remove the interference caused by the dicrotic wave. It can greatly improve the stability of non-contact heart rate measurement.

Description

technical field [0001] The invention relates to a medical electronic measurement method, in particular to a photoelectric reflective pulse heart rate sensor adaptive variable threshold filtering method. Background technique [0002] Non-invasive monitoring technology is an important direction for the development of medical engineering in the future, and the human pulse signal contains rich physiological information, which has gradually aroused great interest of clinicians. There are three main traditional pulse measurement methods: one is to extract from the ECG signal; the other is to calculate the pulse heart rate from the fluctuation detected by the pressure sensor when measuring blood pressure; the third is the photoelectric volume method. The first two methods of extracting signals will limit the activity of the subject, and if used for a long time, it will increase the physical and psychological discomfort of the subject. As one of the most common methods in monitorin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/024
Inventor 田力威何友国刘洋
Owner 天津睿合唯创智能装备科技有限公司
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