EMG Input Device Electrode Switching for Motion Identification
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Solution Overview
Problem
Existing motion identification devices using electromyogram signals face challenges in accurately determining electrode positions on varying body surfaces and maintaining precision due to muscle attachment and motion-induced deviations, leading to increased processing load.
Innovation Solution
An input device with electrodes arranged at a right angle to muscular fiber groups, a switch unit, and a control unit that selects and processes electromyogram signals to reduce processing load by time-divisionally detecting signals and selecting optimal electrodes based on signal-to-noise ratios, facilitating calibration and motion identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all electrodes are used for motion identification, then measurement precision is improved, but device complexity increases due to handling signals from all electrodes
Solution Approach 1:
The patent extracts and processes only the necessary electromyogram signals from specific electrodes that are most relevant for motion identification, rather than processing signals from all electrodes. This selective extraction approach maintains measurement precision while reducing device complexity by eliminating unnecessary signal processing operations.
2Measurement precision
If multiple electrodes are processed simultaneously, then measurement precision is improved, but processing load increases
Solution Approach 1:
The patent employs time-divisional processing where electrodes are activated and processed in sequential time slots rather than simultaneously. This periodic action allows the system to maintain accurate signal detection by systematically cycling through electrode groups while significantly reducing the instantaneous processing load and power consumption.
3Adaptability or versatility
If electrodes are arranged to cover large body surface area, then adaptability is improved, but device complexity increases due to varying muscle attachment methods
Solution Approach 1:
The patent applies local quality by arranging electrodes in specific directional patterns (first direction parallel to muscular fibers, second direction crossing at right angle) that are optimized for detecting electromyogram signals from specific muscle groups. This localized electrode arrangement provides adaptability across different body surfaces while reducing positioning complexity by following standardized anatomical orientations rather than requiring custom placement for each body region.
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 reduces the processing load and maintains precision in motion identification, allowing for efficient and accurate detection of body motions without the need for precise electrode placement, improving user convenience and device performance.
Implementation Method 1
a plurality of electrodes that are arranged on a surface of a body in a direction crossing a muscular fiber group of the body at a right angle, and detect electromyogram signals generated from the muscular fiber group according to a motion performed by the body
Data Source
AI summary
There is provided an input device including a plurality of electrodes that are arranged on a surface of a body in a direction crossing a muscular fiber group of the body at a right angle, and detect electromyogram signals generated from the muscular fiber group according to a motion performed by the body; a switch unit that switches an electrode acquiring an electromyogram signal between the plurality of electrodes; and a control unit that selects an electrode detecting an electromyogram signal for identifying the motion from among the plurality of electrodes.