Electrode Motion Artifact Compensation Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biometric measurement devices face interference from electrode motion artifacts due to changing impedance between the subject and electrodes, which distorts biosignal waveforms and interferes with accurate measurement of information like electrocardiogram signals.
Innovation Solution
A circuit and method that introduce a carrier signal to measure the difference in impedance between electrodes, using a differential amplifier to separate and remove the electrode motion artifact signal from the electrocardiogram signal, allowing for accurate compensation and extraction of the ECG signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a biometric measurement device physically contacts the electrode on the surface of the subject to collect a biosignal, then the electrode can measure the biosignal, but the impedance between the subject and the electrode changes because the subject continually moves and the electrode misses a predetermined measurement point
Solution Approach 1:
The patent applies feedback by continuously monitoring the impedance changes through the electrode and using this information to adjust the measurement system. The impedance monitoring circuit detects changes in impedance caused by electrode movement or poor contact, and this feedback is used to trigger compensation mechanisms or alert operators to reposition the electrode, thereby maintaining measurement accuracy despite subject movement.
Solution Approach 2:
The patent introduces an intermediary impedance monitoring circuit between the electrode and the biosignal measurement system. This intermediary component specifically measures impedance changes and provides separate information about electrode contact quality, allowing the main measurement system to distinguish between actual biosignal variations and artifacts caused by impedance changes, thus maintaining measurement precision while accommodating subject movement.
2Reliability
If the attachment of an electrode is faulty, then the electrode cannot properly measure the biosignal, but the impedance component changes and creates noise such as electrode motion artifact
Solution Approach 1:
The patent uses feedback by monitoring impedance changes to detect faulty electrode attachment. The impedance monitoring circuit continuously checks the electrical contact between the electrode and subject, and when poor attachment is detected through abnormal impedance values, the system can alert the operator or automatically adjust measurement parameters to compensate for the faulty attachment, thereby reducing electrode motion artifacts.
Solution Approach 2:
The patent introduces an intermediary impedance monitoring circuit that acts as a mediator between the electrode and the biosignal measurement system. This intermediary component specifically measures impedance changes and provides separate information about electrode contact quality, allowing the main measurement system to distinguish between actual biosignal variations and artifacts caused by impedance changes, thus maintaining measurement precision while accommodating subject movement.
3Measurement precision
If a biosignal is differentially measured, then the impedance component substantially contained in the biosignal can be measured, but the electrode motion artifact has to be removed because it is defined by the impedance difference between electrodes
Solution Approach 1:
The patent applies segmentation by separating the measurement functions into distinct components: an impedance monitoring circuit that measures impedance changes, a differential amplifier that amplifies the biosignal, and a signal processing unit that distinguishes between impedance artifacts and actual biosignals. This segmentation allows each component to perform its specific function independently, making the overall system more manageable and easier to process.
Solution Approach 2:
The patent introduces an intermediary impedance monitoring circuit between the electrode and the biosignal measurement system. This intermediary component specifically measures impedance changes and provides separate information about electrode contact quality, allowing the main measurement system to distinguish between actual biosignal variations and artifacts caused by impedance changes, thus maintaining measurement precision while accommodating subject movement.
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
This approach effectively compensates for electrode motion artifacts, improving the accuracy of electrocardiogram signal measurement by differentially measuring impedance components and filtering out noise, thereby enhancing the reliability of biosignal data.
Implementation Method 1
a differential amplifier differentially detecting or amplifying signals from the first electrode and the second electrode and outputting an output signal
Implementation Method 2
a carrier signal source oscillating with a carrier signal
Implementation Method 3
measuring an electrocardiogram signal including an electrode motion artifact signal; forming a first impedance between a subject and a first electrode attached to the subject and forming a second impedance between the subject and a second electrode attached to the subject
Data Source
AI summary
A circuit and method for compensating for an electrode motion artifact in which the electrode motion artifact is generated because impedance between a subject and a measuring electrode changes during measurement of the subject's biosignal, and the electrode motion artifact can be differentially measured and an electrocardiogram signal can be compensated by introducing a predetermined voltage or an electric current to the subject. A circuit and method for compensating electrode motion artifact, which can differentially measure the difference information between impedance components by introducing a predetermined voltage or electric current to a subject, in association with the electrode motion artifact. In this instance, the impedance component is a component of electrode motion artifact and the electrode motion artifact is generated when measuring a biosignal.