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－　　－9Omnidirectional Haptic Guidance for the Hearing Impaired to Track Sound SourcesRyuichi SHIMOYAMAWe developed a hearing assistance system that enables hearing-impaired people to track the horizontal movement of a single sound source. The movement of the sound source is presented to the subject by vibrating vibrators on both shoul-ders according to the distance to and direction of the sound source, which are estimated from the acoustic signals detect-ed by microphones attached to both ears. We presented the direction of and distance to the sound source to the subject by changing the ratio of the intensity of the two vibrators according to the direction and by increasing the intensity the closer the person got to the sound source. The subject could recognize the approaching sound source as a change in the vibration intensity by turning their face in the direction where the intensity of both vibrators was equal. The direction of the moving sound source can be tracked with an accuracy of less than 5° when an analog vibration pattern is added to indicate the direction of the sound source. By presenting the direction of the sound source with high accuracy, it is pos-sible to show subjects the approach and departure of a sound source.Keywords : Hearing assist system, Distance, Omnidirection, Sound source, Tactile, Vibration, Horizontal movement聴覚障碍者支援のための音源を追尾可能な全方位触覚ガイダンス　聴覚障害者が1つの音源の水平方向の動きを追跡できる聴覚支援システムを開発した。両耳に装着したマイクロホンで検出した音信号から音源までの距離と音源の方向を推定し，両肩のバイブレータを振動させることで被験者に音源の動きを提示した。2つのバイブレータは、音源方向に応じて強さの比率を変え，音源に近づくほど強さを増すことで，音源の方向と距離を被験者に提示した。被験者は、両バイブレータの強度が同じになる方向に顔を向けることで、音源の接近を振動強度の変化として認識できる。音源の方向を示すためにアナログの振動パターンを付加することで、移動する音源の方向を5°以下の精度で追跡できた。音源の方向を高精度に提示することで、被験者に音源の接近や遠ざかる様子を示すことができる。キーワード：聴覚支援システム、距離、全方向、音源、水平方向の動き、触覚、振動【MDPI】(Molecular Diversity Preservation International)SIGNALS Vol. 2, No. 3, 490-507, Augt 2021 https://doi.org/10.3390/signals2030030Published Paper