Problem when trying to use the Spectrum Analyzer in Simulink.

Greetings ... I am new to the community as well as simulink. The problem I have is that I can not use the Spectrum Analyzer in Matlab R2015a, and whenever I try to open the block only a minimized white window appears, as shown in the attached image and where I can read.

• Spectrum can not be displayed for continuous or infinite sample times.*

Someone knows if I need to configure any parameter of the analyzer, since I can not observe anything when I connect a sinusoidal signal directly. I leave attached an image of the simulation in simulink.

Answer 1

[Amir Salar]

I know it is a little late to answer you Cesar but I will write it anyway I hope it can help people in the future,

I tried to fix this issu by double clicking on my input signals then click on Signal Attributes and scroll down you will see "Sample time" write: 1/(whatever you sample frequency is) ;

Forexample I defined my sample frequency as Fs=96; (this part in matlab)

then I write 1/Fs (this part in simulink)

it solved my problem

Answer 2

[Starhowl]

In my case it was because the sampling frequency of the window was set to 1, while that of all other blocks was set to 1/44100. It didn't matter that all blocks were set to discrete!