I think a Fourier transform would give me equally spaced spectra. I'm interested in a frequency response, where the output of each third octave wide bandpass filter (lopass in series with hi pass one third octave higher) is averaged and plotted in db below full scale. These filters have equal energy per bandwidth rather than equal energy per hertz. Do you know a clever way of converting the linear spectra from an fft into a log plot? Using the filter bank approach, one can have octave wide filters, half octave, or third octave. Can you recommend an easy way of getting 10,20 or 30 spectra from an fft? I keep getting these hints from the experts that java is one level above native arm code, but none of the experts has given the magic rosetta stone link to 'how to speed up your math by running them in native mode'. I'm trying to take my licks as a beginner, and keep a tough outer hide. I keep comng back for more humiliation and suggestions to Read The Fine Manual. Wich I do religiously every day.
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