Mike Raiford wrote:

> Strangely enough the other day I was experimenting with windowing in a 
> Fourier transform to analyze a rather complex FSK signal (Trying to get 
> a grip on how the signal worked ...) The major problem I had with it was 
> the fact that there was significant smearing between samples, that I 
> couldn't tell when the frequencies were changing, not only that it made 
> it exceedingly difficult to determine what the frequencies were. I tried 
> various windowing functions and window sizes.

Yeah, Scotts idea of using a bank of bandpass filters is probably the 
way to go for that. Split the signal into several dozen signals, each 
containing only a narrow band of frequencies. See how much energy each 
signal has.

(I have no idea how you measure signal energy...)

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