Transparent loudspeakers and mics that let your skin play music

An international team of researchers affiliated with UNIST has presented an innovative wearable technology that turns the user's skin into a loudspeaker. This breakthrough was led by Professor Hyunhyub Ko in the School of ...

Tiny speakers break a barrier for sound

In any orchestra, the lowest notes are made by the largest instruments; for example, in the string family, the double bass resonates much lower notes than the violin because it is four to five times larger. The same is true ...

How scientists turned a flag into a loudspeaker

A paper-thin, flexible device created at Michigan State University not only can generate energy from human motion, it can act as a loudspeaker and microphone as well, nanotechnology researchers report in the May 16 edition ...

Do bats know voices of friends they hang out with? (w/ video)

Is it possible that mammals have the ability to recognize individuals of the same species, whom they know well, by their voice? A new study has found that even in nocturnal, fast-moving animals such as bats, there is an ability ...

How an objective audiometric test can become even more reliable

Not only can the human ear detect sounds, it can also generate them. If the ear hears the two upper tones of a major triad, it produces the fundamental of the chord which can then be measured. This phenomenon, called "otoacoustic ...

Recreate the concert in the living room

Hear music of concert hall quality at any place in the room from a stereo recording. The device created by EPFL spin-off Illusonic creates an "acoustic space."

Light-and-sound attacks used against Rome's starlings

Tired of bird droppings on the city's most famous monuments, local authorities in Rome are resorting to unusual measures to try and scare off a million starlings that migrate to the Eternal City every year.

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Loudspeaker

A loudspeaker (or "speaker") is an electroacoustic transducer that produces sound in response to an electrical audio signal input. Non-electrical loudspeakers were developed as accessories to telephone systems, but electronic amplification by vacuum tube made loudspeakers more generally useful. The most common form of loudspeaker uses a paper cone supporting a voice coil electromagnet acting on a permanent magnet, but many other types exist. Where accurate reproduction of sound is required, multiple loudspeakers may be used, each reproducing a part of the audible frequency range. Miniature loudspeakers are found in devices such as radio and TV receivers, and many forms of music players. Larger loudspeaker systems are used for music, sound reinforcement in theatres and concerts, and in public address systems.

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