Engineering

Reducing noise transmitted through an open window

A new device that can reduce the intensity of sound passing through open windows is presented in a proof-of-principle study in Scientific Reports. It fits into a two-panel sliding window and can decrease the perceived loudness ...

Computer Sciences

Identifying a melody by studying a musician's body language

We listen to music with our ears, but also our eyes, watching with appreciation as the pianist's fingers fly over the keys and the violinist's bow rocks across the ridge of strings. When the ear fails to tell two instruments ...

Energy & Green Tech

Wind turbine sounds do not harm health: study

The low-frequency, inaudible sounds made by wind power stations are not damaging to human health despite widespread fears that they cause unpleasant symptoms, research published in Finland on Monday said.

Engineering

High-security identification that cannot be counterfeited

Try whispering at one end of the Echo Wall in the Temple of Heaven in Beijing. People at the far end of the curved wall will hear you from 65 meters away. This is the whispering-gallery effect. Now, researchers from Japan ...

Electronics & Semiconductors

'One-way' electronic devices enter the mainstream

Waves, whether they are light waves, sound waves, or any other kind, travel in the same manner in forward and reverse directions—this is known as the principle of reciprocity. If we could route waves in one direction only—breaking ...

page 1 from 5

Sound

Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations.

This text uses material from Wikipedia, licensed under CC BY-SA