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Dan East · 09-02-2008, 01:15 PM

You would have to process the audio at a low-level within your application. The algorithm you'd be interested in is the fast fourier transformation. However, if you have to process the audio manually, it would probably be easier to implement some sort of simple pulsed audio (think of really fast morse code) instead of DTMF.

Dan East Offline Thumbs Must Hurt Posts: 82 Join Date: Apr 2008 Model: 8130 PIN: N/A Carrier: US Cellular	09-02-2008, 01:15 PM You would have to process the audio at a low-level within your application. The algorithm you'd be interested in is the fast fourier transformation. However, if you have to process the audio manually, it would probably be easier to implement some sort of simple pulsed audio (think of really fast morse code) instead of DTMF.