And this has been a burden of the user answer input by the user is required to assess the status of the hearing aid fitting, to evaluate speech is whether or not hear clearly. And presentation speech control unit for determining a speech to present to see a biological signal measurement section for measuring the EEG signal from the user, the speech database that holds a plurality of speech monosyllabic, evaluation system speech intelligibility, presentation speech an audio output unit for presenting a speech, the speech control unit is determined, from the electroencephalogram signal of the user measured by the biological signal measurement section, characteristic component of the event-related potential in 800ms ± 100ms starting from the time at which the audio is presented Based determining feature component detecting section, the determination result of the feature component detecting section for the presence of, I have a determining speech intelligibility evaluation unit whether or not the user has heard the speech.補聴器のフィッティング状況を評価するための、語音が明瞭に聞き取れたか否かの評価にはユーザの回答入力が必要でありユーザの負担になっていた。語音明瞭度評価システムは、ユーザの脳波信号を計測する生体信号計測部と、単音節の語音を複数保持している語音データベースを参照して呈示する語音を決定する呈示語音制御部と、呈示語音制御部が決定した語音を、音声で呈示する音声出力部と、生体信号計測部で計測されたユーザの脳波信号から、音声が呈示された時刻を起点として800ms±100msにおける事象関連電位の特徴成分の有無を判定する特徴成分検出部と、特徴成分検出部の判定結果に基づき、ユーザが語音を聞き取れたか否かを判定する語音明瞭度評価部とを備えている。
