I know that this subject was already discussed in various forms here. But
without clear answers.
The idea is of course to have a freq domain representation that it close to
the human hearing mechanism.

I see that there is the "spectrum" opcode. It's not clear what it does and
how it is usable.

Here is an interesting article about this subject:
https://dspalgorithms.com/download/pdf/pro98.pdf

The idea is to resample exponentially the input before making an FFT. But I
don't know how the inverse transform is made.

Best,
Bernard




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