PPG Signal Motion Artifact Suppression in Vehicles
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Solution Overview
Problem
Photoplethysmography (PPG) signals in vehicle environments are contaminated by motion artifacts from noise, road vibration, and vehicle movement, leading to skewed biometric interpretations.
Innovation Solution
A computer-implemented method and system that uses optical and pressure sensors to determine consistent PPG waveform signals, aggregate noise signals into a motion artifacts measurement, and process a refined PPG signal by filtering out motion artifacts from the PPG measurement signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PPG signals are captured in a vehicle environment, then biometric data can be obtained for driver monitoring, but motion artifacts from vehicle movement and road vibration contaminate the signals and skew biometric interpretation
Solution Approach 1:
The patent extracts and removes motion artifact components from the PPG signal through signal processing techniques. The system identifies and separates the motion artifact portion from the original PPG signal, effectively taking out the harmful contamination to restore signal quality for accurate biometric interpretation.
Solution Approach 2:
The patent introduces an intermediary signal processing framework that mediates between the contaminated PPG signal and the biometric interpretation process. This intermediary layer processes the signal to eliminate motion artifacts before the data is used for driver monitoring, acting as a buffer that protects the final interpretation from signal contamination.
2Measurement precision
If multiple optical sensors are used to capture PPG signals, then signal consistency can be improved, but system complexity increases
Solution Approach 1:
The patent combines multiple optical sensors into a unified sensor assembly that captures PPG signals from multiple locations simultaneously. By merging the sensing functions and processing the signals through a coordinated system, the patent achieves improved signal consistency through signal aggregation and comparison while managing complexity through integrated design.
Solution Approach 2:
The patent segments the PPG measurement function across multiple optical sensors positioned at different locations on the driver's body. Each sensor captures a portion of the physiological signal, and the system processes these segmented measurements to reconstruct a more reliable and consistent PPG waveform through signal fusion techniques.
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 solution effectively suppresses motion artifacts, resulting in more accurate biometric data and improved interpretation of PPG signals for driver monitoring and vehicle safety applications.
Implementation Method 1
Photoplethysmography (PPG) provides a non invasive optical technique to detect changes in blood volume and blood composition in a biological being
Implementation Method 2
determining a plurality of noise waveform signals based on a plurality of pressure measurement signals output from a plurality of pressure sensors included in the one or more sensor assemblies
Data Source
AI summary
A system and method for processing photoplethysmography (PPG) signals in a vehicle. The system and method include determining a plurality of consistent PPG waveform signals based on a plurality of PPG waveform signals and electronically aggregating the plurality of consistent PPG waveform signals into a PPG measurement signal. The system and method also include determining a plurality of noise waveform signals based on a plurality of pressure measurement signals and electronically aggregating the plurality of noise waveform signals into a motion artifacts measurement signal. The system and method further include processing a refined PPG signal to suppress motion artifacts from the PPG measurement signal by filtering a segment of the PPG measurement signal that is attributed to the motion artifacts represented within the motion artifacts measurement signal.