result of FFT

[Serg Gini]

On Tuesday, 8 July 2025 at 19:59:39 UTC, Serg Gini wrote:
> On Tuesday, 8 July 2025 at 18:11:27 UTC, Matthew wrote:
> From my perspective - solve it in NumPy will be safer approach, 
> but it should be doable in D as well.

Or even better - create D library for this :)
It seems (after fast googling) there are plenty examples in the 
Web

https://github.com/gdereese/dtmf
https://github.com/PlasterPate/DTMF_Decoder
https://github.com/hfeeki/dtmf