Skrasoft Dev Blog

This was news to me. It is well known that any periodic waveform can be represented by an infinite sum of harmonic sine waves. What about making a sine wave from an infinite sum of harmonic square waves?

Blasphemy

Each step in the animation doubles the number of square wave “harmonics” included to approach a pure sine wave. Ignore the numbers in the lower left hand corner despite the attention this sentence draws to them.

I take no credit for the math. I just wrote a GNU octave script to generate the plots based on an equation from http://www.dspdimension.com/