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Humans can observe what and where something happens around them with their hearing, as long as sound frequencies lie between 20 Hz and 20 000 Hz. Researchers have now developed a new audio technique ...

EPFL researchers have developed a 100% effective, ultra-thin active noise cancelling system that uses an ionized air plasma propulsion system instead of speakers. A 17-mm-thick (0.6-in) layer can ...

Graphene sounds: Schematic showing a graphene diaphragm, biased by a DC source, suspended between two perforated electrodes driven at opposite polarity. (Courtesy: A Zettl) Researchers in the US have ...