Seeking a Clear Arduino FHT Code Example

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looking write (or copy) code perform 64-bin fht nano frequency analysis. want analyze 15khz signals 33.2khz sample rate seems right. can't seem find clear code example explains how set number of bins , sample rate, , how view resulting frequency bin array.

also, not clear me if 64-bin fht returns 64 frequency bins or 32 (only half since other half contains imaginary bins).

it returns 64, there 2 bins per frequency phase information not lost - hartley
transform invertible.

perhaps should consider dct?  if you're interested in energy spectrum rather phase it
might better natural choice.


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