detect the appearance of some FFT frequencies

Hello

I use the PCI-5122 and NOR-Scope functions to acquire a signal.

I use an IIR bandpass filter on this signal.

I then use the Express-> VI of spectral analysis to trace a FFT.

I am interested in the apperarence of a certain frequency detection in the FFT and call a function from its appearance.

I guess I'll do that if this frequency exceeds a certain threshold of amplitude to the FFT.

What is the best way to do this?

cosmund

Hello cosmund,

The output of the greatness of the Express VI spectral analysis is a data type of cluster that includes the starting frequency (f0), the difference in frequency between two successive frequency (df) and an array that contains all the points of the scale to the FFT (size). To monitor a certain frequency of an input signal, you will need to retrieve these values.

To do this, you can use the Unbundle by VI name found in the Cluster, class, variant & subpalette in the range of programming. When you the wiring in a data type of cluster, you will be able to each of these three pieces of information by expanding the function and selecting the items to the appropriate cluster. F0 and df values, you will be able to determine what the size array index contains the frequency you want to monitor. Now you can use the table to the table palette Index function to read the size of the FFT frequency you want to monitor.

To call a function based on the size of the FFT, I advise to use a case structure.

I hope this helps!

-Abram

Tags: NI Hardware

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