I (over at Photosounder.com, home of the program that turns sounds into images and images into sound) have just started a new challenge. It consists in denoising a 115 year old sound by editing its image generated via Photosounder using Photoshop/GIMP/whatever you got or by writing a dedicated image processing algorithm.
The winners get a free license of Photosounder worth $140/€99.
Link to the contest with all the details, examples and files : http://photosounder.com/blog/2009/07/gr ... lenge.html
Graphical sound denoising challenge
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If you require help using Audacity, please post on the forum board relevant to your operating system:
Windows
Mac OS X
GNU/Linux and Unix-like