Heart Rate Measurement Noise Reduction via Adaptive Filtering
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Solution Overview
Problem
Current heart rate measurement technologies face challenges in achieving high accuracy, particularly in real-time variations during heart rate training, due to noise interference from body motion.
Innovation Solution
A biological information processing apparatus comprising a sphygmographic sensor unit, multiple calculation units, and an output unit, which calculates heart rate candidate information with reliability, and includes noise reduction processing using adaptive filters and body motion analysis to separate and reduce noise from pulse wave signals, enabling accurate heart rate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photoplethysmography (PPG) system is used for heart rate measurement, then heart rate training and wellness monitoring become possible, but measurement accuracy deteriorates due to body motion noise interference
Solution Approach 1:
The patent introduces body motion sensors as intermediary devices that detect body motion separately from the PPG sensor. The detected body motion signal serves as a mediator to identify and remove motion-induced noise from the pulse wave signal, thereby resolving the contradiction between enabling heart rate training (versatility) and maintaining measurement accuracy despite body motion interference
Solution Approach 2:
The patent extracts the body motion noise component from the composite signal obtained by the PPG sensor. By separating the useful pulse wave information from the harmful body motion noise through signal processing techniques, the system maintains measurement accuracy while preserving the versatility of PPG-based heart rate monitoring
2Measurement precision
If adaptive filter is used to remove body motion noise from pulse wave signal, then heart rate measurement accuracy improves, but device complexity increases due to additional sensors and processing units
Solution Approach 1:
The patent makes the body motion sensor serve multiple functions: it detects body motion for noise removal, and its signal is also used to control the light emitting unit's output. This multi-functionality reduces the need for separate components, thereby improving measurement accuracy while limiting the increase in device complexity
Solution Approach 2:
The system uses the body motion sensor signal to automatically adjust the light emitting unit's output intensity. This self-adjusting mechanism eliminates the need for external control systems, achieving improved measurement accuracy through adaptive noise removal while keeping the device structure relatively simple
3Measurement precision
If light emitting unit output is adjusted based on body motion signal, then signal-to-noise ratio improves, but energy consumption increases due to dynamic adjustment
Solution Approach 1:
The patent dynamically adjusts the light emitting unit's output based on real-time body motion detection. During periods of high body motion, the light output is increased to maintain signal quality, while during low motion periods, output is reduced. This dynamic adjustment improves the signal-to-noise ratio adaptively while managing energy consumption based on actual measurement needs
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
The apparatus achieves highly accurate heart rate measurement by effectively reducing body motion noise and outputting heart rate information with high reliability, allowing for precise real-time heart rate variability and trend analysis.
Implementation Method 1
For those measurement devices, photoplethysmography (hereinafter, referred to as 'PPG system') is widely used
Implementation Method 2
an adaptive filter is provided in which a pulse wave signal output from the sphygmographic sensor is used as an observation signal, and a body motion signal output from the body motion sensor is used as an input signal
Implementation Method 3
a body motion sensor that outputs a body motion signal
Data Source
AI summary
A biological information processing apparatus according to an embodiment of the present technology is provided with a sphygmographic sensor unit, a plurality of calculation units, and an output unit. The sphygmographic sensor unit outputs a pulse wave signal. The plurality of calculation units respectively calculate heart rate candidate information with a reliability on a basis of the output pulse wave signal. The output unit outputs heart rate information on a basis of the heart rate candidate information and the reliability thereof calculated by each of the plurality of calculation units.