http://interface.khm.de/index.php/lab/experiments/frequency-measurement-library/
Ran across this... and to my newbie eyes, it looks like something I could use.
I'm only after conversation range, does it appear to more well trained eyes that I could limit the frequency measured with some additional code. I'm after conversational frequency range, (200Hz to 5,000Hz), so I assume by limiting the range, I can ease the processing done by the hardware...
-Learning as I go!