- 學位論文
聽損兒的聽聲辨位訓練系統
Sound Localization Training System for Hearing Impaired Children
摘要
此論文為了教導聽損幼童學習聽聲辨位，以便能辨識周遭環境中可能產生危險的各種聲響與位置方向，研製了一套協助聽語老師教導聽聲辨位的系統。此系統以遙控方式來控制喇叭所發出的聲音類別與音量大小，也可額外播放環境背景雜音，以提高幼童正確地聽聲辨位的難度，並能自動記錄幼童對各種聲音反應的學習效果。 此系統由聽語老師使用平板電腦做為控制器，遙控選擇聲音與喇叭，利用自行編寫的應用程式來控制擺設在幼童四周的五個喇叭，構成多音源方向的播放設備。當判定學童對聲音的反應情況後，可在應用程式上隨時更新學習記錄並儲存。為了讓判讀也能夠自動化，此系統同時讓學習者在頭帶上配戴了位移與方向感測器，用來偵測聽到聲響後的頭部轉動反應，以便記錄在喇叭發出聲響後，學習者是否有聽到聲音，並正確辨識出聲音的來源方位。 雖然受測者的頭部通常都會不停地微幅晃動，在使用正常聽力者測試的結果中，依據感測器訊號，再透過分類演算所自動分析判讀到的轉頭方向，與實際發聲的方位可有超過 95%的一致性。自動判讀將可以協助聽語老師判定幼童是否聽到刺激聲音之外，也減輕老師上課時需全神貫注的精神負擔。
並列摘要
In order to teach hearing-impaired children to learn sound localization so that they can identify various sounds and locations that may cause danger in the surrounding environment, this thesis develops a system to assist auditory educators in teaching location of sounds. This system uses a remote control to control the type and volume of sound produced by the speakers. It can also play additional ambient background noise, increasing the difficulty to correctly localize sound source. Additionally, it can automatically record reactions of children during the class. The system is operated by auditory educators using a tablet computer as a controller, remotely selecting sounds and speakers. An application program developed for this purpose controls five speakers placed around the child to create a multi-directional audio system. While assessing the child's responses to sounds, learning records are updated and saved in the application automatically. To enable automation of interpretation, this study also has learners wearing displacement and orientation sensors. These sensors detect head movements in response to hearing sounds, allowing the system to record whether learners heard the sound and correctly identified its source direction after the speaker emitted the sound. Although the heads of the subjects typically exhibit continuous movements, in the results obtained with normal hearing individuals, based on sensor signals, automatic analysis through classification algorithms can achieve over 95% consistency with the actual sound source direction. Automatic interpretation can assist auditory educators not only in determining whether child hear stimulating sounds but also in reducing the mental burden of staying fully focused during class.