Hi Mark,

Assume that input is uniform 1kHz sin wave. When we analyze spectrum of
this input using 1024 point FFT, not only one spectral line appears, like
this:

http://www.milky.ne.jp/~galaxy/fft1024.png

This causes peak detection difficult. I want only one spectral line appear
on this case. And, I think this is impossible using FFT.

I have already implemented prelimnary code of filter substitution of FFT.
It works, but very slow.


 --
  Naoki Shibata   e-mail : [EMAIL PROTECTED]

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