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東海道新幹線上級クラス、音を空間に閉じ込めるイヤフォン不要の音響技術
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https://www.watch.impress.co.jp/docs/news/2096591.html
東海道新幹線上級クラス、音を空間に閉じ込めるイヤフォン不要の音響技術
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