Bio-signal Feature Detection Using Envelope Signal Difference
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Solution Overview
Problem
Current methods for estimating blood pressure using bio-signals require significant computation and are not efficient in stably detecting features, particularly in small-sized medical devices like wearable devices.
Innovation Solution
A bio-signal feature detection apparatus and method that generates an envelope signal from acquired bio-signals, such as pulse wave signals, and detects features by calculating differences between the envelope signal and the bio-signal, using techniques like linear connection of peak and valley points, and applying scaling functions to correct and smooth the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods for estimating blood pressure using bio-signals are used, then blood pressure estimation can be achieved, but significant computation is required and feature detection is not stable
Solution Approach 1:
The patent segments the bio-signal processing into distinct stages: envelope signal generation, peak/valley point detection, and feature calculation. By dividing the complex blood pressure estimation process into modular steps, each handling a specific aspect of signal analysis, the system reduces overall computational complexity while improving the stability of feature detection through specialized processing at each stage.
Solution Approach 2:
The patent applies preliminary action by generating an envelope signal from the bio-signal before performing feature detection. This preprocessing step creates a simplified representation of the signal that highlights key features while reducing noise and complexity, making subsequent detection more stable and computationally efficient.
2Weight of moving object
If small-sized medical devices like wearable devices are used, then portability is improved, but computational capabilities are limited
Solution Approach 1:
The patent extracts only the essential features needed for blood pressure estimation from the full bio-signal, rather than processing the entire signal. By identifying and extracting key characteristics through envelope signal analysis and peak/valley detection, the system minimizes computational requirements while maintaining accuracy, enabling implementation in resource-constrained wearable devices.
Solution Approach 2:
The patent transforms the bio-signal into an envelope signal, changing the parameter representation from raw amplitude-time data to a processed envelope form. This parameter transformation simplifies the signal structure, reducing the computational power needed for analysis and making the solution suitable for small-sized devices with limited processing capabilities.
Data Source
AI summary
An apparatus and method for detecting a bio-signal feature are provided. The apparatus according to one aspect may include: a bio-signal acquirer configured to acquire a bio-signal; and a processor configured to generate an envelope signal of the bio-signal, and detect at least one feature of the bio-signal based on a difference between the envelope signal and the bio-signal.