Engineers design solutions to tackle low-frequency noise

Low frequency noise 500 Hertz and lower, which could stem from various sources such as construction machineries and aircrafts, is a form of environmental noise problem in urban environments. Such noise transmits over long distances and cause disturbance to wide area. It is also known to trigger a number of negative physiological reactions such as changes to blood pressure, vertigo and breathing difficulties even when the noise is not audible.
Most commercially available noise canceling devices and structures today, however, are only effective in reducing high frequency noise, while low frequency noise continues to penetrate through these structures. To more effectively mitigate low frequency noise, a team of engineers from the National University of Singapore (NUS) has therefore designed a set of novel noise attenuating blocks that targets low frequency noise.

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