[PD] DTMF recognition / Goertzel algorithm in Pd?

[Alexandre Torres Porres]

Hi there, a friend is looking for a way to do DTMF recognition in Pd. I
know there is this Goertzel algorithm <
http://en.wikipedia.org/wiki/Goertzel_algorithm> and I wonder if anyone has
already implemented something about it in PD.

Maybe some other option?

thanks
Alex
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