I seem to recall you have an iPhone, check out the free app "n-track tuner"= which does a real time fft and displays the spectrum along with the detect= ed note. It will give you some good insight into what you'll have to deal w= ith in the way of strong overtones on a guitar signal. Cheers, Robin. On 9 Apr 2012, at 17:53, "V G" wrote: > On Mon, Apr 9, 2012 at 11:54 AM, Herbert Graf wrote: >=20 >> Do a transform in to the frequency space (DFT or others depending on >> what hardware you've got) and usually just select the biggest peak. >>=20 >> You might have program a little more intelligence then that if you the >> guitar is being put through distortion stuff, but I doubt it. >>=20 >> If you're update rate is low (say 5Hz) you have lots of options. >>=20 >=20 > I'm leaning towards this option the most. It feels the most logical. I'll > probably use a dsPIC or a PIC32 depending on which chip can give me the > most DSP performance. >=20 > 5Hz seems like a very reasonable update frequency, I'll probably go with > 10Hz or so. What do you mean by "lots of options"? >=20 > Around what update frequency should I expect if I use a modern dsPIC or a > PIC32 at full speed? > --=20 > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .