64 band spectrum analyzer

[yliniemi]

I made a fast and accurate spectrum analyzer. You can actually tell which note is playing.
I'm doing Fourier analysis with 4096 samples with 85% overlap. I get 70 fps. The accuracy comes from the Kaiser 3 windowing I do before the FFT.

This is just a prototype. I'll be adding features one by one but the algorithm is done.

Thank you for an amazing library <3
I've had a great deal of fun with it in the last two months.

https://www.youtube.com/watch?v=avjwpHCYAm0&t=105s

[pschatzmann]

Cool. Which FFT Library do you recommend?

[yliniemi]

I use Robin Scheibler's fft library modified for Arduino IDE
https://github.com/yash-sanghvi/ESP32/tree/master/FFT_on_ESP32_Arduino

It deals with real input and gives complex output. I chose it over ArduinoFFT because it's way faster and uses way less ram.

[grayoctagon]

That looks amazing.

It would be very nice to have the .ino file to use in other Projects :)

[JoaoPedroAssis]

@yliniemi I just now found this discussion and was impressed by you project! Could you share the source code? I would be extremely useful in my own project. thanks!

[pschatzmann]

If you are looking for an easy way to do FFT I can recommend my audio-tools library
And here is an example with an output to an LED Matrix with only 55 lines of code!