He’s using a Fast Fourier Transform routine crafted in C to run as efficiently as possible on the 8-bit chip. The video after the break shows that the results are quite pleasing, with just a bit ...

The more general form of transferring the frequency domain to the time domain is termed the inverse Fourier transform. See: COMPLEX TONE, FOURIER THEOREM, HARMONIC SERIES, SINE WAVE. Compare: GRANULAR ...

From there, a Fast Fourier Transform is taken ... This data is then used to pulse the LEDs in time with the beat. It’s a fun project that demonstrates the basic techniques required to build ...