Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsNoise Cancellation in Headphoneshttp://demonstrations.wolfram.com/NoiseCancellationInHeadphones/]]>http://demonstrations.wolfram.com/NoiseCancellationInHeadphones/