How to measure bandwidth

Hey,.

I did a little code that allows to calculate the bandwidth of an FFT spectrum, but I need some improvements of this caluclation.

what I did is:

1. I calculated the FFT of the time signal.

2 - I calculated the maximum of the FFT spectrum and divided it by 2 to get the max of half.

3 i made a linear interpolation using the equation (x = x 0 + ((x1-x0) *(y-y0)) / (y1 - y0)) and used half max. as input for y.

4. I used the legend of cursor to determine the 2 points (x 0, y0), (x 1, y1) necessary for linear interpolation and then I wrote these point values in the controls 'Bandwidth calculation' to find x, which is the bandwidth.

is it maybe better to calculate? I want to say how can I change the code so that I can find the bandwidth automatically without the need to give the values of these 2 points?

Thank you

Here is my code...

As the first point is greater than half of max, I'm not sure how significant the calculation is.

A way to find the max half point is to use the threshold function of table 1 d.  It only works on arrays with increasing values, then to find the falling threshold, subtract the table of the peak value.

I have attached an amendment to your VI to show a way to do this.  I also showed how the calculation can be done with the primitives of LV math rather than the node of the formula.

Lynn

Tags: NI Software

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