Transfer-Function Brain Wave Correction for Off-Head Sensing
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Solution Overview
Problem
Existing brain wave measurement technologies face challenges in accurately obtaining brain wave signals at body parts other than the head region, leading to significant attenuation and reduced accuracy.
Innovation Solution
A brain wave correction device and method that utilize a transfer function to correct brain wave signals obtained at body parts other than the head region, using sensors attached to both the head and a second body part, to infer high-accuracy signals by calculating a transfer function for signal conversion and comparing with reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If brain wave sensors are attached to body parts other than the head region, then ease of operation is improved, but measurement precision deteriorates due to signal attenuation
Solution Approach 1:
The patent introduces a transfer function as an intermediary mathematical model that bridges the gap between body-part signals and head-region signals. This transfer function acts as a mediator that transforms the easily obtainable body-part brain wave signals into accurate head-region equivalent signals, resolving the contradiction between ease of operation and measurement precision
Solution Approach 2:
The patent changes the parameter representation of brain wave signals by applying transfer functions that transform signals from one body location to another. By changing the spatial parameter through mathematical transformation, the system maintains high measurement precision while allowing sensors to be placed at more convenient body locations
2Measurement precision
If brain wave sensors are attached to the head region, then measurement precision is improved, but ease of operation deteriorates due to demanding attachment requirements
Solution Approach 1:
The patent creates a mathematical copy of head-region brain wave signals by using transfer functions to transform body-part signals. Instead of physically placing sensors on the head, the system creates an equivalent representation through signal transformation, thereby maintaining measurement precision while eliminating the operational difficulty of head attachment
3Measurement precision
If transfer function correction is applied to body part signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing transfer functions before actual brain wave measurement. The transfer functions are obtained in advance through calibration processes, so that during actual operation, only simple signal transformation is needed rather than complex real-time calculations, thus reducing operational device complexity while maintaining high measurement precision
Data Source
AI summary
At a body part other than the head region, brain wave signals having high accuracy are obtained. A brain wave correction device includes: a transfer function obtaining unit that, based on a brain wave signal at a first body part and a brain wave signal at a second body part different than the first body part at the time when a user has a predetermined thought, obtains a transfer function for brain wave signals between the body parts; a brain wave obtaining unit that obtains a brain wave signal at the second body part; a brain wave correcting unit that corrects, based on the transfer function, the brain wave signal obtained at the second body part and calculates a corrected head-region brain wave signal; and a brain wave comparing unit that, based on the corrected head-region brain wave signal and based on a reference brain wave signal obtained in advance at the first body part, estimates the thought arising in the user.