Biosignal Filtering Circuit for Motion-Noise Heart Rate Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biosignal measurement devices, such as ECG sensors, face challenges in accurately measuring heart rates and other biosignals due to noise interference caused by movement and unstable skin contact, leading to unreliable readings, especially in dynamic states.
Innovation Solution
A biosignal measurement method and apparatus that utilize a first voltage distribution time constant circuit and a waveform converter to filter and convert biosignals into pulse signals, removing noise and improving signal reliability through a series resistance and capacitor configuration, and further processing with a Schmitt trigger and counter to generate accurate biometric information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an existing ECG sensor is used to measure biosignal, then the measurement can be performed, but noise increases and measurement reliability deteriorates when a person shows great movement or has unstable skin contact
Solution Approach 1:
The patent segments the biosignal processing into multiple stages: initial biosignal acquisition, frequency band filtering to separate useful signal from noise, and subsequent processing. This segmentation allows targeted noise removal while preserving the useful biosignal components, directly resolving the contradiction between maintaining measurement reliability and eliminating noise interference
Solution Approach 2:
The patent introduces an intermediary filtering process between the ECG sensor and the final measurement output. The filter acts as a mediator that selectively passes useful frequency components while blocking noise frequencies, thereby improving measurement reliability without requiring changes to the original sensor or direct contact with the noisy signal
2Measurement precision
If traditional biosignal processing is used, then the system remains simple, but measurement accuracy deteriorates due to inability to filter noise effectively
Solution Approach 1:
The patent changes the frequency domain parameters of the biosignal by filtering specific frequency bands. By transforming the signal from time domain to frequency domain analysis and selectively filtering, the system achieves higher measurement accuracy while keeping the processing methodology relatively simple and systematic
Solution Approach 2:
The patent replaces complex mechanical or hardware-based noise filtering mechanisms with electronic/digital signal processing methods. Instead of using physical filters or mechanical isolation, the system uses voltage distribution time constant circuits and digital filtering algorithms to achieve noise removal, simplifying the overall system while improving 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 solution enables the acquisition of highly reliable biometric information, such as heart rate and pulse rate, even in dynamic states, by stabilizing signals and filtering out noise, resulting in more accurate and reliable biosignal measurements.
Implementation Method 1
The first voltage distribution time constant circuit filters a signal of a specific frequency band from the biosignal based on voltage distribution using a series resistance included in the first voltage distribution time constant circuit
Implementation Method 2
a first capacitor connected between the first series resistance and the second series resistance. The first voltage distribution time constant circuit may have a voltage distribution time constant of a first threshold or less that is determined using the first series resistance, the second series resistance, and the first capacitor
Implementation Method 3
converting the biosignal to a pulse signal using a waveform converter
Implementation Method 4
counting the pulse signal using a counter and generating first biometric information
Data Source
AI summary
Provided is a method and apparatus for measuring a biosignal. The biosignal measurement method may include measuring, at a biosignal measurement apparatus, a biosignal using a biosignal measurement sensor; processing, at the biosignal measurement apparatus, the biosignal and converting the biosignal to a pulse signal using a first voltage distribution time constant circuit and a waveform converter; and counting, at the biosignal measurement apparatus, the pulse signal using a counter and generating first biometric information. The first voltage distribution time constant circuit may filter a signal of a specific frequency band from the biosignal based on voltage distribution using a series resistance included in the first voltage distribution time constant circuit.