PPG Sensor Oxygen Saturation Measurement via Signal Distortion Filtering
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Solution Overview
Problem
Conventional electronic devices cannot accurately measure oxygen saturation due to distortion of photoplethysmogram (PPG) signals caused by pressure from sensors, as they fail to identify and account for signal distortion resulting from sensor contact.
Innovation Solution
An electronic device equipped with a PPG sensor, processor, and memory that band-pass filters data to identify signal distortion due to pressure, allowing for accurate measurement and display of oxygen saturation data by excluding distorted portions from the graphical user interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a PPG sensor is used to measure oxygen saturation, then biometric information can be obtained, but signal distortion occurs due to pressure applied to the body by the sensor
Solution Approach 1:
The patent applies preliminary action by performing band-pass filtering on the PPG signal before processing it for oxygen saturation calculation. This preprocessing step removes distorted portions of the signal caused by sensor pressure, ensuring that only valid signal segments are used for measurement. The filtering operation is performed in advance to prevent distorted data from affecting the final oxygen saturation result.
2Ease of operation
If the sensor contact surface applies pressure to the body, then the sensor can detect biometric information, but the PPG signal becomes distorted
Solution Approach 1:
The patent applies the extraction principle by isolating and removing the distorted portions of the PPG signal from the overall signal. Through band-pass filtering, the system extracts only the valid, undistorted signal segments and excludes the portions affected by sensor pressure. This separation allows the measurement system to utilize only the reliable parts of the signal for oxygen saturation calculation.
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 precise measurement of oxygen saturation by filtering out signal distortions caused by sensor pressure, improving the accuracy of biometric data collection and user interface display.
Implementation Method 1
The electronic device may measure the oxygen saturation in blood by using a photoplethysmogram (PPG) acquired through the sensor
Implementation Method 2
generate second data by band-pass filtering the first data
Data Source
AI summary
An electronic device includes a housing, a touchscreen display viewable through a first part of the housing, a photoplethysmogram (PPG) sensor exposed through a second part of the housing, a processor disposed in the housing and operatively connected to the touchscreen display and the PPG sensor, and a memory disposed in the housing and operatively connected to the processor, wherein the memory stores instructions that, when executed, are configured to cause the processor to receive first data from the PPG sensor, generate second data by band-pass filtering the first data, generate oxygen saturation data based on at least some of the second data, select a first portion related to a first period of time from the second data, and display, on the touchscreen display, a graphical user interface including information related to the oxygen saturation data except for data corresponding to the first portion from the graphical user interface.