Power Spectrum peak calculator

[needtolearnfast]

Hi,

I am using the "fft power spectrum.vi" to calculate an FFT on a wave and the output of that is some bundled wire called power spectrum. I was wondering is there an easy way to take this output and find and display all the various peaks in the power spectrum? Thanks.

[RobertH]

hello,

did you try the VI "Peak Detector.vi" in the palette:
"Functions -> Analyze -> Signal Prcessing -> Time Domain"

regards,

robert h

[needtolearnfast]

Yes, I did try that, but the problem is I don't understand the inputs required for it as it requires
"X" a set of points, but when you run the power spectrum you get a bundled wire with various parts and I'm not
sure which of these to wire into the peak detector as everything I have tried has given me wierd values. Thanks for
any help.

[RobertH]

hello,

you must unbundle the cluster, which is returned by the power spectrum. take the "magnitude", which is the array, which contains the information about the spectrum.

regards,
robert h

[needtolearnfast]

It worked, Thanks a lot for the help.