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  Noise canceling technology+speakers 
 
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Dimosthenis Serk Feb 15, 2012, 06:44pm EST Reply - Quote - Report Abuse
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Hello,

I would like to ask you if there is even the slightest possibility to combine the noise canceling technology with speakers, in order to create a "space" in which you enter, and there is a difference on the noise level. What do you think is the biggest obstacle?

Thank you.


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john albrich Feb 15, 2012, 09:37pm EST Reply - Quote - Report Abuse
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Edited: Feb 15, 2012, 09:40pm EST

 
>> Re: Noise canceling technology speakers
.
Might give you some ideas.

As these deal with ultrasound, these aren't exactly what you're looking for but are related. They're in the direction I got the impression you were going with audio heterodyning, beat frequencies, nulls, etc.

http://en.wikipedia.org/wiki/Sound_from_ultrasound
Products

There are currently four known devices which have been marketed that use ultrasound to create an audible "beam" of sound.

Audio Spotlight
F. Joseph Pompei of MIT developed technology he calls the "Audio Spotlight", and made it commercially available in 2000 by his company Holosonics, which according to their website claims to have sold "thousands" of their "Audio Spotlight" systems. Disney was amongst the first major corporations to adopt it for use at the Epcot Center, and many other application examples are shown on the Holosonics website.

HyperSonic Sound
Elwood "Woody" Norris, founder and Chairman of American Technology Corporation (ATC), announced he had successfully created a device which achieved ultrasound transmission of sound in 1996. ATC named and trademarked their device as "HyperSonic Sound" (HSS). In February 1998, HSS was named the Best of What's New for 1997 by readers of Popular Science.In December 2002, Popular Science named HyperSonic Sound the best invention of 2002. Norris received the 2005 Lemelson-MIT Prize for his invention of a "hypersonic sound". ATC (now named LRAD Corporation) spun off the technology to Parametric Sound Corporation in September 2010 to focus on their Long Range Acoustic Device products (LRAD), according to their quarterly reports, press releases and executive statements.

Mitsubishi Electric Engineering Corporation
Mitsubishi apparently offers a sound from ultrasound product named the "MSP-50E" but commercial availability has not been confirmed.

AudioBeam
The German audio company Sennheiser Electronic once listed their "AudioBeam" product for about $4,500. There is no indication that the product has been used in any public applications. The product has since been discontinued.



Not mentioned in the Wikipedia article:
http://www.patentstorm.us/patents/6052336/description.html
Apparatus and method of broadcasting audible sound using ultrasonic sound as a carrier
"It is still another object of the present invention to provide a device that will emit audible sound to listeners located in a defined area."
Inventor: Lowrey

edit: cleaned up heading format


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