Biological Signal Measurement With Carrier Feedback Noise Suppression
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Solution Overview
Problem
Existing biological signal measurement methods struggle to effectively remove noise, particularly motion artifacts, from signals obtained using electrodes, which can obscure accurate detection of biological signals like ECG signals.
Innovation Solution
The apparatus employs at least three interfaces to obtain signals from the body, applies a carrier signal with a frequency higher than the frequency of interest, generates a feedback signal using component signals from these interfaces, and adjusts the signal input to an amplifier using a feedback control unit to reduce noise and motion artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a carrier signal with frequency higher than biological signal frequency is applied to remove noise, then noise and motion artifacts are effectively removed, but the device complexity increases due to additional signal application unit and feedback signal generation unit
Solution Approach 1:
The patent implements a feedback signal generation unit that receives the applied carrier signal, processes it through component signal generation, and feeds back a corrected signal to the signal application unit. This closed-loop feedback mechanism enables automatic noise cancellation while maintaining measurement accuracy, resolving the contradiction between improved measurement precision and increased device complexity by making the system self-regulating
Solution Approach 2:
The patent introduces a carrier signal as an intermediary substance that mediates between the measurement system and the biological signal. The carrier signal, having frequency higher than the biological signal, acts as a mediator to extract and remove noise components without directly interfering with the biological signal measurement, thus improving accuracy while managing system complexity
2Measurement precision
If at least three interfaces are used to obtain signals and generate feedback signal, then noise removal effectiveness is improved, but the device complexity increases due to additional interfaces and signal processing units
Solution Approach 1:
The patent divides the signal acquisition system into multiple independent interfaces (at least three interfaces), where each interface independently obtains signals from the body. This segmentation allows the feedback signal generation unit to process signals from different interfaces separately, improving noise removal effectiveness through multi-channel information while managing complexity through modular interface design
Solution Approach 2:
The patent makes the signal application unit and feedback signal generation unit perform multiple functions: they not only apply carrier signals for noise removal but also generate feedback signals that can be used for various signal processing purposes. This multi-functionality reduces the need for separate dedicated components, thereby improving noise removal effectiveness while limiting the increase in device complexity
Data Source
AI summary
An apparatus for measuring a biological signal of a body, the apparatus including; at least three interfaces which obtain signals from the body, a signal application unit which applies a signal having a frequency which is higher than one of a frequency of interest of the biological signal to one of a first interface from among the at least three interfaces, and one of a plurality of internal elements of the apparatus, a feedback signal generation unit which generates a feedback signal from component signals generated due to the applied signal, wherein the feedback signal generation unit generates the feedback signal using a signal obtained from at least one of a second interface and a third interface from among the at least three interfaces and an input control unit which receives the generated feedback signal and controls a signal input from at least one of the second interface and third interface to an amplifier.