Digital signal processing with teeny-tiny tap-dancers.

When we wrote about accelerating Fast Fourier Transforms (FFTs) on the Pi back in January, several people asked what sort of real-world application FFTs can have. We talked about numerical analysis, cryptography, spectrograms and software-defined radio, among other things, in the comments on that post. All the same, FFTs are something that those who don’t get excited by maths can find a bit dry, and it can be hard to find a good demonstration of FFTs that works for those of you who like to think about things visually

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