Is it FFT or similar to it?
QuoteIs it FFT or similar to it?Not even close. If it was that simple there would be no need for PlainFFT, Fix_FFT, FFTW etc.When you subtract the previous measurement from the current one you are computing the slope of the curve which is essentially the derivative (i.e. the rate at which the voltage is changing). So, if you use that to drive the amplitude of a LED it will be brightest where the voltage changes the fastest (usually the loudest part) and dimmest where there's little or no change.Pete
but still i think that the visual is pretty okay