Ear-Clip Signal Quality Detection Using AC Component Similarity
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Solution Overview
Problem
Conventional ear-clip devices for measuring blood oxygen concentration face challenges in determining the accuracy of signal quality, as users cannot visually confirm proper wearing position, leading to external noise interference and inaccurate calculations due to scattered light and reflective modules.
Innovation Solution
A signal quality detection method and device that filters sensing signals from an ear-chip physiological measurement device, calculates the similarity of red and infrared light AC components, and generates a reliability index using correlation coefficients to indicate signal quality, assisting users in adjusting the wearing position for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a reflective light module is used in the ear-clip device, then the device structure is simplified and ease of manufacture is improved, but external noise interference increases and measurement precision deteriorates
Solution Approach 1:
The patent introduces an optical isolation structure (light shield) as an intermediary element between the light source and external environment. This mediator blocks external light from reaching the photodetector, preventing noise interference while allowing the reflective light module to function. The light shield acts as a barrier that separates the measurement system from harmful external light sources, resolving the contradiction between using simple reflective modules and achieving precise measurements.
2Device complexity
If no visual indication of wearing position is provided, then device complexity is reduced, but users cannot confirm proper attachment and measurement reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism by providing visual indicators (such as LED lights or display elements) that show users whether the device is properly attached to the ear. This feedback allows users to confirm correct wearing position and adjust if necessary, ensuring reliable measurements without significantly increasing device complexity. The system monitors attachment status and communicates this information back to the user in real-time.
3Device complexity
If signal quality detection is not implemented, then device complexity is lowered, but accuracy of blood oxygen concentration calculation deteriorates
Solution Approach 1:
The patent implements preliminary signal quality detection and filtering before performing blood oxygen concentration calculations. By pre-processing the optical signals to remove noise and validate signal quality, the system ensures that only high-quality data is used for calculations. This preliminary action prevents inaccurate results without requiring complex post-processing algorithms, maintaining relatively simple device architecture while improving measurement precision.
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 method provides real-time reliability indices to help users adjust the device position, ensuring high accuracy in blood oxygen concentration measurements by filtering out noise and maintaining waveform periodicity.
Implementation Method 1
The light-emitting diodes emit light, and the photodiodes receive light signals passing through vessels
Implementation Method 2
The light-emitting diodes emit light, and the photodiodes receive light signals passing through vessels
Implementation Method 3
filtering the sensing signal to generate a pre-processed signal
Data Source
AI summary
The present invention provides a signal quality detection method for an ear-chip physiological measurement device. The signal quality detection method includes receiving a sensing signal from the ear-clip physiological measurement device; filtering the sensing signal to generate a pre-processed signal; calculating a physiological index according to the pre-processed signal; and calculating a similarity of a red light alternating current (AC) component and an infrared light AC component of the pre-processed signal and a plurality of correlation coefficients of the red light AC component, and generating a reliability index of the physiological index accordingly. The reliability index indicates one of a plurality of signal qualities.