Music to spectrogram on iOS with the accelerate framework
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Output of FFT:


On a sample basis

Let ps stand for "per sample"

C[1] gives the 1/N ps coefficient

C[2] gives the 2/N ps coefficient

C[N/2] gives the 1/2 ps coefficient

In seconds

Let f (=44100) be the samplerate. Then:

C[1] gives the f/N hz coefficient

C[2] gives the 2f/N hz coefficient

C[N/2] gives the f/2 hz coefficient

From herz to position

Let h be some frequency. Then from the above we see that for m := Nh/f we get the mf/N = h hz coefficient in C[m].