M. Adam Davis ha scritto:
> 
> [...]
> consumes running at 4kHz (DTMF highest tone is 1,633Hz), but you may
> be able to meet your needs by running the goertzel algorithm discussed
> on the list a bit ago:


yeah, was going to suggest the same: do it in software.


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Ciao, Dario
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Cyberdyne
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