Fourier Transform in Simulink

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Zjuv9021
Zjuv9021 el 20 de Dic. de 2019
Respondida: Nikhil Sonavane el 26 de Dic. de 2019
Hello,
I'm simply trying to add up an arbitrary number of sine waves and output the frequency chart with the blocks below:
fft.PNG
the matlab function is to perform the fftshift:
function y = fcn(u)
y = fftshift(u)
size(y)
end
But the output of the array plot doesn't seem to make sense, as I've chosen 10 Hz and 20 Hz within the Sine Wave block:
Capture.PNG
The output of the array plot I would suspect should show peaks at both 10 Hz and 20 Hz, but displays something I'm not quite understanding:
Capture2.PNG
Does anyone have any suggestions on something I'm simply missing here?
  2 comentarios
Nikhil Sonavane
Nikhil Sonavane el 23 de Dic. de 2019
Can you share your Simulink model so that it is easier for me to reproduce your problem?
Zjuv9021
Zjuv9021 el 23 de Dic. de 2019
Please see attached.

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Respuestas (2)

Ridwan Alam
Ridwan Alam el 23 de Dic. de 2019

Nikhil Sonavane
Nikhil Sonavane el 26 de Dic. de 2019
The Matrix Block used isn't giving desired results as the Sum over field is not configured properly. Change the Sum over field to Specified dimension and select the Dimension as 2. For more information execute the following command in MATLAB command window and execute it-
openExample('dsp/TransformTimeDomainDataIntoFrequencyDomainExample')

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