Hello,
You could use filters for the tones like in this equalizer circuit.
http://sound.westhost.com/project75.htm
Afther each filter you could place a rectifier that gives you the intensity of the tone.
Greetings,
Bertus
Audacity cannot generate DTMF (Dual Tone Multiple Frequency) and the link that Bertus gave you, cannot save the tones, as far as I can see - but you can fetch this zip with 300ms DTMF files.I have an Audio Editor (Audacity) that can generate tones as sine, square, or sawtooth wave - will that work? If so, which one?
by Don Wilcher
by Jake Hertz
by Jake Hertz
by Jake Hertz