Patent ID: 8849391
Filing Date: 2014-09-30
Classification: A61B

Abstract:
1. A speech sound intelligibility assessment system comprising: a speech sound database retaining a plurality of speech sounds; a presented-speech sound control section for determining a speech sound to be presented by referring to the speech sound database; an output section for presenting the determined speech sound to a user; a biological signal measurement section for measuring an electroencephalogram signal of the user; a positive component determination section for determining presence or absence of a positive component of an event-related potential in the electroencephalogram signal in a zone from 600 ms to 800 ms from a starting point, the starting point being a point in time at which the output section presents a speech sound; a negative component determination section for determining presence or absence of a negative component of an event-related potential in the electroencephalogram signal in a zone from 100 ms to 300 ms from a starting point, the starting point being a point in time at which the output section presents a speech sound; and a speech sound intelligibility assessment section for evaluating whether the user has clearly aurally comprehended the presented speech sound or not, based on a result of determination as to presence or absence of the positive component acquired from the positive component determination section and a result of determination as to presence or absence of the negative component acquired from the negative component determination section; wherein the speech sound intelligibility assessment section: