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Cloak of Silence: no more noisy neihbours

June 15, 2008
clipped from news.bbc.co.uk

Woman with finger on lips

Being woken in the dead of night by noisy neighbours blasting out music could soon be a thing of the past.


Scientists have shown off the blueprint for an “acoustic cloak”, which could make objects impervious to sound waves.


The Spanish team who conducted the new work believe the key to a practical device are so-called “sonic crystals”.


These artificial composites – also known as “meta-materials” – can be engineered to produce specific acoustical effects.


Acoustic cloak simulation
Sound waves are channelled around an object by sonic crystals



“Unlike ordinary materials, their acoustic properties are determined by their internal structure,” explained Professor Pendry.


These would be used to channel any sound around an object, like water flowing around a rock in a stream.

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