How to draw a spectrum like this?

[Legends]

[Legends]

I want to use Labview to do STFT and the ideal answer is shown like that picture. I want to know is it possible to draw a graph like that in Labview? Thank you!

[GerdW]

Hi Legends,

yes, it's possible: use the intensity chart or graph!

[Legends]

Thanks for your answer. I know I need to use intensity graph, but I don know how to get the right answer like the picture shows which the spectrum is distributed in blocks in time axis.Simply connecting the output of the STFT and the input of intensity graph cannot get what I want. 

[Legends]

Thanks for your answer. I know I need to use intensity graph, but I don know how to get the right answer like the picture shows which the spectrum is distributed in blocks in time axis.Simply connecting the output of the STFT and the input of intensity graph cannot get what I want.

[GerdW]

Hi Legends,

using a graph you need to collect your FFT data over time and plot the collected array.

By using a chart you can wire the FFT data directly to the chart as it will maintain it's own history of data…

[Legends]

Hi GerdW,

Thanks for your advice. I will try to do it as you say.

Best regards,

Legends

[Legends]

Dear GerdW,

The required pic shows that it puts several STFT spectrum together. By simply wiring intensity chart to STFT I cannot get that. If it is possible, could you give me a simple example which can get the similar graph so I can learn? Thank you!

Best regards,

[GerdW · Accepted solution]

simple example consisting of signal generator, STFT and intensity chart: