Biological Signal Acquisition Device Noise Reduction
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Solution Overview
Problem
The challenge is to accurately acquire biological information from a stick-on type device with multiple light emitting and receiving units, as movement and varying mounting methods introduce noise artifacts, making it difficult to separate biosignal noise from actual signals.
Innovation Solution
The solution involves a modulation mechanism that dims light emitting units at a specific frequency, a receiving mechanism to capture biosignals from multiple light receiving units, and an adjustment mechanism to level the signal intensity based on specific frequency components, ensuring accurate biosignal acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light receiving means are used in array form to improve measurement precision, then biological information can be acquired more accurately through statistical calculation, but noise artifacts increase due to device twisting and varying mounting methods
Solution Approach 1:
The patent applies preliminary action by modulating the light emitting means at a specific frequency before signal acquisition. This pre-modulation embeds a known frequency signature into the light signal, allowing the receiving means to later identify and isolate the desired biosignal from noise artifacts through frequency-based filtering. The modulation occurs before the signal is affected by mounting variations or device twisting, thus preparing the signal for robust noise rejection.
Solution Approach 2:
The patent converts the harmful effect of device twisting and mounting variations into a benefit by using frequency domain analysis. Instead of trying to prevent noise artifacts from occurring, the system allows them to exist but distinguishes them from the modulated biosignal through their different frequency characteristics. The noise artifacts, while present, do not interfere with the extracted signal because they lack the specific modulation frequency.
2Object-generated harmful factors
If light emitting means are dimmed at a specific frequency to enable signal modulation, then noise artifacts can be reduced through frequency-based filtering, but signal intensity varies across different light receiving means
Solution Approach 1:
The patent applies feedback by measuring the actual signal intensity received by each light receiving means and using this information to adjust the gain or weighting of subsequent signals from that particular receiver. The system continuously monitors and compensates for intensity variations, ensuring that all receiving means contribute equally to the final biosignal regardless of their individual characteristics or positioning.
Solution Approach 2:
The patent changes the parameter of signal intensity through dynamic adjustment of amplification factors or weighting coefficients for each light receiving means. By modifying these parameters based on initial calibration or real-time measurements, the system equalizes the contribution of each receiver, compensating for manufacturing tolerances and positioning variations without affecting the modulation frequency approach.
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 allows for high-accuracy acquisition of biological information by reducing noise artifacts and normalizing signal intensities, enhancing the reliability of biosignal processing.
Implementation Method 1
a light emitting unit P1 and two or more light receiving units S1, S2... The light receiving units S1, S2 receive light from the living body
Data Source
AI summary
According to the present invention, in a configuration in which a biological signal is received from an attachment-type device including one or more light emitting means and two or more light receiving means, information on a living body is acquired with high accuracy. A modulation unit (110) dims the one or more light emitting means with a specific frequency, a receiving unit (120) receives a biological signal based on the light received from a living body through the two or more light receiving means, and an adjusting unit (130) adjusts the intensity of the biological signal acquired from each light receiving means on the basis of the component of a specific frequency of the biological signal.