I'm trying to do something like this.
I need to decode 6 tones that came in a combination of 2 ( 1+2, 1+3, ...,
5+6) and i'd like to know if you can help me and if possible show the part
of the code used to decode the DTMF tones.

Thanks, Mauricio

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> De: John Payson <supercat@MCS.NET>
> Para: PICLIST@MITVMA.MIT.EDU
> Assunto: Re: FFT with 16C84?
> Data: Quarta-feira, 12 de Fevereiro de 1997 00:01
>
> > > Is this possible with the C84 (or F84 :) and an A/D-conv + FFT in
> > > software?
> >
> > The short answer is no.  The '84 does not have anywhere near enough
> > resources to perform real-time FTs.  Even 'touch-tone' decoding
> > is a challenge.
> >
> > You are better off using 7 analogue band pass filters and sampling
> > the output peaks.  This could be done with a MUX input ADC such as
> > the PIC16C74, or an external unit such as NSC's ADC8017 (16 input).
>
> With a 16C622 I have managed to do a pretty good job of DTMF detection at
> 11.0592MHz (looking for all 7 frequencies simultaneously).  If you don't
> need terribly good accuracy, a 16C84 may be able to handle the job.