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| Fig 1 Sound Waves cdn.bleedingcool.net |
This week's task is to research into and find out some interesting things you can do with sound.
In basic terms sound is a vibration that occurs through mediums such as air or water and is heard by an animal or human. Although it it used for primarily communication, entertainment and is often the by product of other activities, sometimes sound really is something to shout about. So here is a short list of interesting and artistic things people have achieved by making a lot of noise.
1) Levitation
Yes, really. Sound waves create compressions in the air when played between two or more plates at the correct frequencies. When these compressions meet, it creates an 'interface' and this interface can be used to make things hover.
2) Ultrasound (Ultrasonic Imaging)
Although many people know the name, not many actually realise that ultrasound images actually are produced through the use of sound. The ultrasound machine transmits high-frequency (1 to 5 megahertz) sound pulses into your body using a probe. The sound waves travel through your skin & tissue and device called a transducer then receives the sound waves as they bounce back from inside your body. The sound waves are then used to produce images.
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| Fig. 2 Ultrasound www.belizeportablexray.com |
3) Electrostatic Bell Choir
The Televisions are automatically tuned to varying channels of white noise which causes them to build up increasing amounts of static. This then agitates the bells causing them to lightly strike the bells, creating sound.
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| Fig. 3 Electrostatic Bell choir www.creativeapplications.net |
From the Darsha website: "The Electrostatic Bell Choir is an electromechanical sound installation that plays with the static electricity emitted from discarded CRT television monitors. This static (that can be felt when one places their hand on the screen when the TV is turned on) is gleaned for its potential to generate subtle movement and is used as the driving kinetic force in the artwork."
See it in action HERE.
4) Theremin
A Theremin is a music instrument which allows the user to create sound and music with their hands by physically interrupting a magnetic field produced by each antenna on the instrument.By interrupting the magnetic field, a sine wave is fed to a component which is then amplified to make sounds.The user can then adjust the pitch and volume of the instrument depending on what position their hands are in relation to each antenna.
Image
Fig. 1 Sound Waves (n.d.) [Image online] Avaialable at: http://cdn.bleedingcool.net/wp-content/uploads/2014/08/sound-wave.png?9098e0 [Last accessed on 18/11/2014]
Fig. 2 Ultrasound (2010) [image online] available at: http://belizeportablexray.com/wp-content/uploads/2014/02/Ultrasound.jpg [Last accessed on 18/11/2014]
Fig. 3 Electrostatic Bell Choir (2912) [image online] available at: http://belizeportablexray.com/wp-content/uploads/2014/02/Ultrasound.jpg [Last accessed on 18/11/2014]
Video
Randy Gerge, (2013) Super Mario Bros. on the Theremin [video online] available at: https://www.youtube.com/watch?v=xcTPRjiCs6s [Last accessed on 18/11/2014]
落合陽一 (2014) Three Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation] (2014-) [Video Online] Available at: https://www.youtube.com/watch?v=odJxJRAxdFU [Last accessed on 18/11/2014]
Darsha Hewitt (2013) Electrostatic Bell Choir 2013 [video online] available at: https://www.youtube.com/watch?v=x9srgjQrs4U [last accessed on 18/11/2014]
Expert Village (2008) How to play the Theremin: How does a Theremin work? [video online] available at: https://www.youtube.com/watch?v=rEM8Ka7eKTc [last accessed on 18/11/2014]
Web
Hewitt, Darsha (n.d.) Electrostatic Bell Choir 2012, [online] available at:
http://www.darsha.org/?cat=18 [Last accessed on 18/11/2014]
Freudenrich, Craig, C (n.d.) How Ultrasound Works [online] available at: http://www.physics.utoronto.ca/~jharlow/teaching/phy138_0708/lec04/ultrasoundx.htm [last accessed on 18/11/2014]
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