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

[nada khatib]

You have to use "signal specfication" block between the spectrum analyzer and the signal you want to see its spectrum. Then set the sample time inside the block "signal specification" to specific value (such as 1/320000)

Answer 3

[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!