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It's interesting, but a little slow in my slow machine. Does it use FFT or the "normal" FT?

It uses an FFT implemented on the GPU via WebGL.

Interesting result on IE:

http://hypftier.de/temp/2014-09-01_182732.png

The FT part seems to work, though.

I imagine that even using the FFT and not the "normal" DFT, signals processing done in browser is slow for a lot of people.

Signal processing in javascript maybe, but webGL is a hardware accelerated native code module, so it can be fast.

WebGL systems are actually very promising for a number of computationally intensive areas, such as medical imaging: http://www1.eafit.edu.co/cadcamcae/documents/non_final_paper...

The current WebGL is just the beginning. Once we get a new one with compute shaders (basically WebGL based on ES 3.1 instead of 2.0) things are really going to pick up.

Shoehorning algorithms to work as fragment shader produces a considerable performance and mental overhead compared to compute shaders.

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