FFT - Frequency Response

[jamison.suade]

Hi everyone! 

I'm having a problem on my time domain and fft plot.

In the attached VI below, i made a Chirp signal and perform FFT (left side) and I wanted to have a plot which is moving similar to the Chirp signal I got from the net, which is at the right side of this VI.

I wanted my plot to be moving, or in real-time, I know this is just in the settings, but i cant figure it out. I've tried countless time already to obtain a plot similar to those at the right side of this VI. Also the amplitude of my FFT, is very small from the original amplitude value of 1.

Thanks, for the response.

[altenbach]

I am missing your subVIs, so I cannot run your example. Are they from a toolkit?

If you want a changing frequency over time in the fft display, you need to look at a changing subset of the chirp signal.

[jamison.suade]

The sub vi is in this libarary 

[jamison.suade]

The sub vi is in the Sweep Generator --- Test Linear Sweep Generator

[GerdW]

Hi gijude,

it could be so easy with some elementary math:

Reading online documentation like WIKIPEDIA can be a great source of wisdom…