ほぼすべての音を消し去る消音システム、香港科技大が開発。2つのレゾネーターで99.7%無音化 - Engadget Japanese

http://japanese.engadget.com/2015/09/16/2-99-7/?ncid=rss_truncated
Subwavelength total acoustic absorption with degenerate resonators
http://scitation.aip.org/content/aip/journal/apl/107/10/10.1063/1.4930944