Pulsation Detection System Body Motion Noise Removal
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Solution Overview
Problem
Existing pulsation detection systems struggle to accurately obtain pulsation information during active sports due to noise interference from body motion, requiring advanced computing and high-speed processors, which is impractical for real-time processing.
Innovation Solution
A pulsation detection system that uses a body motion measuring device to detect positional changes in reflected light from the skin, allowing for the removal of noise from pulse wave information, enabling accurate pulsation detection through easy computer processing and real-time data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If advanced computing operations and high-speed processors are used to remove body motion noise from pulse wave information, then measurement precision of pulsation information is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent extracts body motion information as a separate signal from the pulse wave information, then removes this extracted noise component from the original pulse wave signal. This is achieved by detecting body motion using a body motion sensor, extracting the noise component, and subtracting it from the pulse wave information to obtain clean pulsation information, thereby avoiding complex computing operations.
Solution Approach 2:
The patent introduces body motion information as an intermediary element that mediates between the noisy pulse wave signal and the desired clean pulsation information. By using this intermediate body motion signal, the system can effectively remove noise without requiring advanced computing algorithms or high-speed processors.
2Measurement precision
If advanced computing operations are performed in real-time to remove body motion noise, then pulsation information accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent extracts body motion information as a separate signal from the pulse wave information, then removes this extracted noise component from the original pulse wave signal. This approach uses simple signal extraction and subtraction operations that consume minimal energy compared to advanced computing algorithms.
Solution Approach 2:
The system uses the body motion sensor to automatically detect and provide the noise component, which is then automatically subtracted from the pulse wave information. This self-service mechanism eliminates the need for energy-intensive real-time computing operations while maintaining accurate pulsation detection.
3Measurement precision
If body motion information is detected using 3 axis accelerometer, then body motion measurement capability is improved, but the transition timing does not correspond with pulse wave information and high correlation cannot be recognized
Solution Approach 1:
The patent changes the detection parameters from 3-axis acceleration measurements to light reflection intensity measurements at positions away from the skin. This parameter change enables the body motion information to have transition timing that corresponds with the pulse wave information, achieving high correlation between the two signals for effective noise removal.
4Measurement precision
If light sources and photodetectors are positioned close to the skin for pulse wave detection, then pulse wave signal strength is improved, but body motion noise increases
Solution Approach 1:
The patent segments the detection system into two separate components: one for detecting pulse wave information (with light sources and photodetectors positioned close to the skin) and another for detecting body motion information (with light sources and photodetectors positioned away from the skin). This segmentation allows each component to optimize its detection capability while the body motion component serves to remove noise from the pulse wave signal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and real-time pulsation information retrieval during sports by effectively removing body motion noise from pulse wave data, facilitating efficient data transfer and management.
Implementation Method 1
a pulse wave sensor to detect pulse wave information based on an intensity of reflected light of an infrared light from a blood vessel of an arm
Implementation Method 2
a body motion light source which irradiates a diffused light to the skin, and a body motion photodetector which receives the diffused light reflected from the skin
Implementation Method 3
a photodetector which receives the diffused light reflected from the skin
Implementation Method 4
two light sources which irradiate light to a skin of a living body
Data Source
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AI summary
Disclosed is a pulsation detection system 1 for obtaining the accurate pulsation information of which a noise of a body motion is removed. The system 1 comprises a beat detector 3 obtaining a pulse wave information and body motion information containing a body movement noise, and a pulsation detector 4 outputting a pulsation information of which the noise of the body motion is removed from pulse wave information. The beat detector 3 comprises a pulse wave measuring device 31, and a body motion measuring device 32 comprising a light source irradiating and a photodetector for detecting a reflected light from the skin, arranged at a position away from the skin. The pulsation detector 4 comprises a receiver 44 for receiving the pulse wave information and the body motion information, and a body motion remover 45 removing the noise so as to output an accurate pulsation information to the output part.