Patent ID: 9232905
Filing Date: 2016-01-12
CPC Classification: A61B,G16H,H04R

Claim Text:
1. An uncomfortable sound pressure estimation system comprising: a biological signal measurement section configured to measure an electroencephalogram signal of a user; a sound stimulation output section configured to present a sound stimulation group to the user, the sound stimulation group including a first sound, a second sound, and a third sound which are pure tones of a same frequency and which consecutively decrease in sound pressure within a predetermined range, so as to constitute monotonously descending sound pressures in a sound pressure range higher than a hearing threshold level (HTL) and lower than a sound pressure which is generally evaluated to be an uncomfortable level (UCL); an extraction section configured to extract, from the electroencephalogram signal in a predetermined zone defined based on a point of presenting at least one of the second sound and the third sound as a starting point, an N1-P2-amplitude related or wavelet-coefficient related characteristic amount of event-related potential of the electroencephalogram signal; and a determination section configured to determine an uncomfortable sound pressure at the frequency of the sound stimulation group based on the characteristic amount extracted by the extraction section.