PPG Heartbeat Profile Extraction With Multi-Wavelength Baseline Correction
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Solution Overview
Problem
Photoplethysmography (PPG) data is often noisy due to sloping baselines and baseline shifts, making it difficult to accurately segment heartbeat cycles and perform reliable biometric monitoring.
Innovation Solution
A method and device for generating a baseline corrected heartbeat profile by determining end-of-phase information, calculating baseline correction points, and applying principal component analysis (PCA) to correct sloping baselines and shifts across multiple wavelength channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PPG data is collected using multiple wavelength channels, then the information content and measurement capability are improved, but the data becomes noisier due to sloping baselines and baseline shifts
Solution Approach 1:
The patent segments the PPG signal processing into distinct stages: detecting peaks and troughs in each wavelength channel, determining end-of-phase information, calculating baseline correction points, and applying baseline correction. This segmentation allows systematic handling of baseline noise across multiple wavelength channels while preserving the informative content of each channel.
Solution Approach 2:
The patent introduces end-of-phase information as an intermediary element that connects peak/trough detection with baseline correction. By determining when each phase ends based on multiple wavelength channels and using this information to calculate baseline correction points, the method mediates between the raw noisy signals and the corrected heartbeat profile, effectively reducing baseline noise while maintaining measurement accuracy.
2Reliability
If baseline correction is applied to reduce noise, then the reliability of biometric monitoring is improved, but the complexity of data processing increases
Solution Approach 1:
The patent performs preliminary detection of peaks and troughs in each wavelength channel before applying baseline correction. By identifying these key points first and determining end-of-phase information in advance, the method prepares the necessary correction points beforehand, making the subsequent baseline correction more straightforward and reliable without requiring overly complex real-time processing.
Solution Approach 2:
The patent changes the parameter space by working with end-of-phase information and baseline correction points rather than directly processing the raw noisy signals. This parameter transformation simplifies the baseline correction operation while maintaining its effectiveness in improving heartbeat cycle segmentation reliability.
Data Source
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AI summary
A device may determine end-of-phase information for a plurality of wavelength channels of photoplethysmography (PPG) data. The device may calculate a set of baseline correction points for each wavelength channel of the plurality of wavelength channels. The set of baseline correction points may be calculated based on end-of-phase information for a wavelength channel of the plurality of wavelength channels and PPG data associated with the wavelength channel. The device may perform a baseline correction for each wavelength channel of the plurality of wavelength channels. A baseline correction may be performed for the wavelength channel based on the set of baseline correction points associated with the wavelength channel and the PPG data associated with the wavelength channel. The device may generate a baseline corrected heartbeat profile using a principal component analysis of a result of baseline correcting each wavelength channel of the plurality of wavelength channels.