[SWLUG] Noise abatement

[Daniel Drummond]

plebs.col at virgin.net wrote:
>   Is there  software or a device that will hear sound and generate the  
> sound cancelling sound  so that sound presently attacking  can be  
> cancelled?    The interesting thing is that the cancelling noise that will  
> stop noise coming this way will confuse noise that has not got here  
> yet.      Might persuade the generators to stop.
>   
Yes, noise-cancelling headphones are available in shops everywhere.  I 
also remember hearing of this technique being used to reduce engine 
noise heard inside a car.

http://en.wikipedia.org/wiki/Noise-cancelling_headphones
http://www.argos.co.uk/webapp/wcs/stores/servlet/Search?storeId=10001&catalogId=1500001801&langId=-1&searchTerms=0483696&Submit=GO+%3E

> Anyone know what is being writ about and have suggestions?      There is  
> some info in http://openlearn.open.ac.uk/mod/resource/view.php?id=285748
>
> Any hope of a Jericho trumpet that will quarry stone?
>
> Ilyan
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