LabVIEW
mulitple wave functions
No problem. Will this do for finding the peak freqs? (Written in LV 8.2.1) Inputs are your signal (to the FFT) and a magnitude cutoff.
-Matt
Well, you couldn't graph them separately yet. Next thing you need to do is put in the three bandpass filters based on the frequencies that FreqFinder found. Then you'll get three filtered signals, each with one of the frequencies in it. If you FFT those and plot it, you should see one peak per plot.
Caveats: You have to make the band narrow enough so it doesn't include the other freqs, so you may want to calculate the high and low cutoff frequencies based on the three freqs -- for example, if you have f1, f2, and f3 (in increasing frequency), then the upper cuttoff freq for the f1 filter should be the greater of f1 + (f2-f1)/10 or f1 +100 ... or something like that.
Does that help?
-Matt
Hope you are feeling better.
The easiest way is to generate known signals (simulated) and see if it finds them (say at 100, 1K and 2K Hz). Sorry, I can't look at the code right now (I can only upload new code when I am at work). One thing you can also try is the express VI Tone -- it will even let you set the frequencies you want to extract. Unfortunately, you can't do this dynamically (which is what you want), but it would be a good way to check your code using a known simulated signal.
-Matt
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