On: Implementing Neural Networks on a "10-cent" RISC-V...

[jononor]

Thanks! Yeah transforming into a time-frequency is the standard method. Short Time Fourier Transform (STFT) using FFT is the most common, though one can use FIR/IIR filterbanks also. It is however quite challenging to do in just a few kB of RAM. It looks doable with 4 kB in total, miiight be possible with 2 kB.

[cpldcpu → jononor]

Maybe something simpler, like a haar wavelet, would also work? Or DFT using Görtzel?