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A consumer stereo bone conduction headset. The two transducers fit slightly in front of the ears.

Bone conduction is the conduction of sound to the inner ear through the bones of the skull. Bone conduction transmission can be used with individuals with normal or impaired hearing.

Overview[edit]

Bone conduction is one reason why a person's voice sounds different to him/her when it is recorded and played back. Because the skull conducts lower frequencies better than air, people perceive their own voices to be lower and fuller than others do, and a recording of one's own voice frequently sounds higher than one expects it to sound.[1][2]

Hearing aids[edit]

Some hearing aids employ bone conduction, achieving an effect equivalent to hearing directly by means of the ears. A headset is ergonomically positioned on the temple and cheek and the electromechanical transducer, which converts electric signals into mechanical vibrations, sends sound to the internal ear through the cranial bones. Likewise, a microphone can be used to record spoken sounds via bone conduction. The first description, in 1923, of a bone conduction hearing aid was Hugo Gernsback's "Osophone",[3] which he later elaborated on with his "Phonosone".[4]

Products[edit]

Bone conduction products are usually categorized into three groups:

  • Ordinary products, such as hands-free headsets or headphones
  • Hearing aids and assistive listening devices
  • Specialized communication products (e.g. for underwater or high-noise environments)

One example of a specialized communication product is a bone conduction speaker that is used by scuba divers. The device is a rubber over-moulded, piezoelectric flexing disc that is approximately 40 millimetres (1.6 in) across and 6 millimetres (0.24 in) thick. A connecting cable is moulded into the disc, resulting in a tough, waterproof assembly. In use, the speaker is strapped against one of the dome-shaped bone protrusions behind the ear and the sound, which can be surprisingly clear and crisp, seems to come from inside the user's head.[citation needed]

Use in the 21st century[edit]

The Google Glass device employs bone conduction technology for the relay of information to the user through a transducer that sits beside the user's ear. The use of bone conduction means that any vocal content that is received by the Glass user is nearly inaudible to outsiders.[5]

German broadcaster Sky Deutschland and advertising agency BBDO Germany collaborated on an advertising campaign that uses bone conduction that was premiered in Cannes, France at the International Festival of Creativity in June 2013. The "Talking Window" advertising concept uses bone conduction to transmit advertising to public transport passengers who lean their heads against glass train windows. Academics from Australia's Macquarie University suggested that, apart from not touching the window, passengers would need to use a dampening device that is made of material that would not transmit the vibration from the window.[6][7]

See also[edit]

References[edit]

  1. ^ Zhi Cai; Alan G. Madsen; Douglas G. Richards; Martin L. Lenhardt (2002). "Response of Human Skull to Bone Conducted Sound in the Audiometric to Ultrasonic Range" (PDF). Response of Human Skull to Bone Conducted Sound in the Audiometric to Ultrasonic Range. Virginia Commonwealth University. Retrieved 3 July 2013. 
  2. ^ Brent Zupp (2003–2012). "Why Does Your Voice Sound Different on a Recording?". Wanderings. Brent Zupp. Retrieved 3 July 2013. 
  3. ^ US 1521287, Gernsback, Hugo, "Acoustic Apparatus", published 19 May 1923, issued 30 December 1924 
  4. ^ Kennedy, T. R., Jr. (1958). "From Coherer to Spacistor". Radio-Electronics (Gernsback Publications) 29 (4): 45–59. 
  5. ^ Charles Arthur (2 July 2013). "Google Glass – hands-on review". The Guardian. Retrieved 3 July 2013. 
  6. ^ Catherine McMahon; Phillip Nakad (12 July 2013). "Bone conduction: the new front in guerilla advertising". The Conversation Australia. Retrieved 15 July 2013. 
  7. ^ Leo Kelion (3 July 2013). "Talking train window adverts tested by Sky Deutschland". BBC News. Retrieved 15 July 2013. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Bone_conduction — Please support Wikipedia.
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8303 news items

Popsop.com

Popsop.com
Mon, 13 Apr 2015 06:41:15 -0700

Now you can drink whiskey and hear music transmitted through the lower jaw directly to the inner ear—and it's not hallucinations: that's the new Johnnie Walker “Boldest Glass” designed to fully reveal the flavour of the new Johnnie Walker and Ginger ...

Gizmodo UK

Gizmodo UK
Fri, 10 Apr 2015 04:50:55 -0700

Whisky specialist Johnnie Walker has hit upon a weird way to encourage the guzzling of high proof alcohols -- drinking them alongside an audio tool that uses bone conduction technology to turn the glass into a personal speaker. The company says the ...

Android Community

Android Community
Wed, 08 Apr 2015 20:11:15 -0700

A device has turned up on Indiegogo called the Cynaps Bluetooth bone conduction headset in a hat that allows you to hear phone calls and listen to music without having to wear earphones or ear buds. If this product sounds familiar, it was on Indiegogo ...
 
Stockhouse
Tue, 07 Apr 2015 10:15:00 -0700

For people who are deaf in one ear, or have conductive or mixed hearing loss, the Baha 5 Sound Processor is not only the smallest bone conduction sound processor in the industry, it is full of advanced hearing technologies designed to help users hear ...

Bidness ETC

Med Device Online (press release)
Sun, 29 Mar 2015 22:37:30 -0700

Sophono's magnetic bone conduction hearing implants are currently available in 42 countries and have been implanted in more than 4,000 patients. These implants are intended for patients 5 years and older with single-sided deafness (SSD) or conductive, ...
 
The Wall Street Transcript
Thu, 26 Mar 2015 09:30:00 -0700

Sophono's magnetic bone conduction hearing implants are currently available in 42 countries and have been implanted in more than 4,000 patients. These implants are intended for patients 5 years and older with single-sided deafness (SSD) or conductive, ...

PLoS Blogs (blog)

PLoS Blogs (blog)
Thu, 16 Apr 2015 10:15:00 -0700

It is important to note that while the authors found that the 'bone conduction mechanism' seemed to be the main mechanism for hearing in their model, it may only be applied specifically to fin whales since it was the only skull type that they studied ...

Lifehacker

Lifehacker
Tue, 10 Feb 2015 16:01:50 -0800

Bone conduction speakers give you the ability to hear things that nobody else can by vibrating your own bones, and this covert system—that fits perfectly inside of a pen—can be activated by simply biting down on it. Using a standard FM radio receiver ...
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