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Editorial Team
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Asked: 2026-05-14T05:45:06+00:00

I have a question regarding use of FFT. Using function getBand(int i) with Minim

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I have a question regarding use of FFT. Using function getBand(int i) with Minim i can extract the amplitude of a specific frequency and do pretty maps of it. Works great.

However, this is a more of a curiosity question. When i look at the values extracted from playing the same song two twice using the same frequency (so the amplitude should be identical) but i get very different values – why is this?

0.0,0.0,0.0,0.0,0.0,0.08706585,0.23708777,0.83046436,0.74603105,0.30447206
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.08706585,0.4790409,0.9608221,0.83046436,0.74603105
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1 Answer

  1. Editorial Team

    Are you sure the inputs are exactly the same in both cases ? If you’re just taking a random segment of a song then the output of an FFT will be very different for different starting points in the song.

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