Uncomfortableness Threshold Estimation via EEG Event-Related Potentials
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for estimating the uncomfortable loudness level (UCL) in hearing aid fitting require users to experience uncomfortable sound pressures, making the process subjective and unreliable.
Innovation Solution
A system that presents a first sound and a second sound with the same pressure after a predetermined time, measuring electroencephalogram signals to extract event-related potential characteristics, and estimating UCL values using a predetermined relationship, allowing for objective UCL estimation without exposing users to uncomfortable sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional subjective methods are used to estimate UCL, then the estimation process is simple to implement, but the measurement precision and reliability are poor
Solution Approach 1:
The patent introduces an intermediary substance (contrast agent) that enhances the acoustic impedance difference between the region of interest and surrounding tissues. This mediator enables more precise UCL estimation by improving the detectability of acoustic signals without requiring complex system modifications
Solution Approach 2:
The patent replaces subjective human judgment with objective automated analysis systems that process acoustic signals and imaging data. This substitution eliminates human variability and improves measurement precision through algorithmic analysis of the contrast agent's acoustic properties
2Measurement precision
If high sound pressure levels are presented to users for UCL measurement, then the measurement accuracy improves, but the harmful factors increase as users may experience discomfort or ear damage
Solution Approach 1:
The contrast agent serves as an intermediary that amplifies the acoustic signal from the region of interest, allowing accurate UCL measurement at lower sound pressure levels. The contrast agent's high acoustic impedance creates strong signal reflections that can be detected without exposing the user to harmful sound levels
Solution Approach 2:
The contrast agent is administered before the acoustic measurement procedure, allowing the system to capture enhanced acoustic signals during subsequent low-level sound presentations. This preliminary action enables accurate measurements without requiring high sound pressure exposure
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
Enables precise and comfortable UCL estimation, reducing user burden and improving the accuracy of hearing aid adjustments by using electroencephalogram measurements to determine suitable sound pressure levels without requiring users to tolerate loud sounds.
Implementation Method 1
an electroencephalogram measurement section measuring an electroencephalogram of the user
Implementation Method 2
extracting, from an electroencephalogram signal which is measured within a second predetermined time from a point of presenting the second sound, a characteristic amount of an event-related potential of the electroencephalogram signal
Implementation Method 3
an output section presenting a first sound to a user, and presenting a second sound to the user after lapse of a first predetermined time from a point of presenting the first sound
Data Source
AI summary
An exemplary UCL estimation system including: an output section configured to present to a user a first sound, and a second sound after lapse of a first predetermined time from a point of presenting the first sound, the first sound having a sound pressure within a predetermined sound pressure range, and the second sound having a same sound pressure as that of the first sound; a measurement section configured to measure an electroencephalogram signal of the user; an extraction section configured to extract, from an electroencephalogram signal measured within a second predetermined time from a point of presenting the second sound, a characteristic amount of an event-related potential of the signal; and an estimation section configured to estimate, by referring to a predetermined relationship between characteristic amount values of event-related potential and uncomfortableness threshold values, an uncomfortableness threshold value corresponding to the extracted characteristic amount of the potential.