Sound attenuation as a function of frequency for the two prototype silent windows (Image: Mokpo National Maritime University)
A variety of Helmholtz resonators were used to fabricate the test windows (Image: Mokpo National Maritime University)
A combination of two different acoustic effects results in a frequency band in which sound is strongly attenuated (Image: Mokpo National Maritime University)
A prototype window design that lets air pass through, but attenuates outside sounds by 30-35 decibels (Photo: Mokpo National Maritime University)
Resonant behavior of a Helmholtz resonator that results in a region of negative dynamic compressibility (Image: Mokpo National Maritime University)
Prototype window designs for testing sound attenuation properties. These have three layers of diffraction resonators, with either one, two, or four partitions per resonator (Image: Mokpo National Maritime University)
There are few things better than lazing around the house on a warm summer day, whose fragrant zephyrs speak of spicy isles and heaven-breathing groves.* At least, until the neighbors start their leaf-blowers and the city needs to tear up the sidewalks. Noise pollution is one of the scourges of urban and suburban life, which can drown out nature's melodies to cause annoyance, stress, and hearing loss. Now, however, a team of South Korean engineers has invented a remarkable window that lets air in while keeping a great deal of noise out.
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