Scott Dattalo asks:

> But I have to ask, why would one need to compute an FFT in a PIC?

Why not?  For the same reason you have to compute it in any other micro,
surely?  Am I missing out on an alternative?

I can't give full details of the project I'm working on, but in overview it's
a tool for testing decay in telegraph poles by analysing the vibration
spectrum from the pole when it is stimulated with an impulse.  The FFT is one
stage in a fairly complex algorithm which produces a good/decayed indication.
The algorithm was developed on a PC using Delphi, and then ported into a
low-cost hand-held device.  Hence the use of a PIC.

I'm not being sarcastic when I said "Why not?" above.  Would you have used
different approach?  You are clearly much more experienced than I and I'd love
to learn!

Best wishes,

Steve Thackery
Suffolk, England.
Web Site: http://www.btinternet.com/~stevethack/