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https://hanzama.x0.to/2020/08/30/takashi-okubo-a-designer-of-sound-takashi-okubo-said-the-sound-of-an-emergency-earthquake-is-being-consolidated-around-3-kilohertz-weekly-pre-news/
“音のデザイナー”小久保隆「ケータイの緊急地震速報音は3キロヘルツ周辺に音を集約させています」(週プレNEWS)