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7:42 PM | February 02, 2013
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matthen: The smooth motion of rotating circles can be used to build up any repeating curve even one as angular as a digital square wave. Each circle spins at a multiple of a fundamental frequency, and a method called Fourier analysis shows how to pick the radiuses of the circles to make the picture work. Decomposing signals like this lies at the heart of a lot of signal processing. [more] [code]

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MrHonner2013-02-03 15:23:58
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Beautiful demonstration of the fact that any periodic function is a sum of sines and cosines.

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