FFT

[Sapir1]

Hey,

Suppose I do FFT on an input signal and get the following values: the smallest value F obtained is 82HZ followed by F 164HZ which is also the peak of frequency. How can I numerically extract the value of 82HZ?

Thanks 

[GerdW]

Hi Sapir,

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@Sapir1 wrote:

Suppose I do FFT on an input signal and get the following values: the smallest value F obtained is 82HZ followed by F 164HZ which is also the peak of frequency. How can I numerically extract the value of 82HZ?

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Search for peaks in the spectrum data…

[Kyle97330]

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@GerdW wrote:

Hi Sapir,

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@Sapir1 wrote:

Suppose I do FFT on an input signal and get the following values: the smallest value F obtained is 82HZ followed by F 164HZ which is also the peak of frequency. How can I numerically extract the value of 82HZ?

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Search for peaks in the spectrum data…

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Specifically, the Peak Detector VI is a good place to start.

[altenbach]

What "value" do you like to extract? (amplitude? Magnitude? Phase? exact frequency?)

Especially the large peaks seems to be way off phase, so you might want to look at the magnitude instead.

(blindly wiring the complex FFT to a graph will only display the RE part. Place an "absolute value" on the complex wire to see the magnitude instead.)