Anyone got any other tutorials for the Fourier Transform?

Anyone got any other tutorials for the Fourier Transform? While waiting on my audio board for my teensy I’m messing with numpy and want to understand FFT better. The dumber the better as it’s been way to long since I’ve done any calculus :slight_smile:

http://thefouriertransform.com/
http://thefouriertransform.com

Best I can do is this http://wiki.openmusiclabs.com/wiki/ArduinoFFT and their faster FHT: http://wiki.openmusiclabs.com/wiki/ArduinoFHT