Multi-Electrode Contact Measurement Using Reference Signal Demodulation
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Solution Overview
Problem
Existing electronic devices face challenges in determining and maintaining adequate electrode-skin contact quality for accurate biological signal measurements, which can lead to poor signal quality and incomplete or inaccurate data due to varying contact conditions.
Innovation Solution
A method and device that apply a reference signal to electrodes, measure different subsets sequentially, generate a composite signal, and use demodulation to separate the reference signal, allowing for the determination of contact quality metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference signal is applied to electrodes and demodulation is performed to separate the reference signal, then contact quality metrics can be determined, but the device complexity increases due to additional signal processing requirements
Solution Approach 1:
A reference signal is applied to the electrodes before biological signal acquisition to establish a baseline for contact quality assessment. This preliminary action enables subsequent demodulation to separate contact quality metrics from biological signals, allowing accurate contact assessment without interfering with normal measurement operations.
Solution Approach 2:
The reference signal acts as an intermediary carrier that modulates contact quality information. By applying this intermediate signal and performing demodulation, the system can extract contact quality metrics from the composite signal containing both reference and biological signals, resolving the contradiction between measurement accuracy and system simplicity.
2Productivity
If electrode-skin contact is insufficient, then the device can still perform measurements, but the signal quality and data accuracy deteriorate
Solution Approach 1:
The system continuously monitors contact quality by demodulating the reference signal from the composite electrode signal. When contact quality falls below acceptable thresholds, the system provides feedback to prevent or terminate measurements, ensuring that only high-quality data is collected. This feedback mechanism maintains reliability without unnecessarily restricting productivity.
Solution Approach 2:
Contact quality assessment is performed before initiating biological signal measurements using the reference signal methodology. This preliminary evaluation ensures that measurements only proceed when adequate contact is established, preventing poor-quality data acquisition while maintaining measurement productivity when conditions are favorable.
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 continuous assessment of electrode-skin contact quality, ensuring reliable biological signal acquisition by adjusting operations based on contact metrics, thereby improving signal quality and data accuracy.
Implementation Method 1
the reference signal is applied to the subsets of the set of electrodes through a set of coupling capacitors
Implementation Method 2
The processing circuitry demodulates the composite signal to separate the first signal from the corresponding biological signals of the digitized plurality of acquired signals
Data Source
AI summary
Embodiments are directed to systems and methods for determining a metric associated with electrode-skin contact quality. A reference signal is applied to a set of electrodes. The quality of contact between each electrode or subset of electrodes and the skin determines the amplitude of a contact signal that may be measured by processing circuitry of an electronic device. The contact signals for each of the electrodes, and any biological and/or other signals that may be acquired by the electrodes, are measured sequentially in a series of sampling windows. The measured signals associated with each sampling window are digitized and sequentially stored. A composite signal is generated from the sequentially stored samples and demodulated, to provide an output signal. The output signal may be analyzed to determine a metric associated with the contact quality between the set of electrodes and the skin of the user.