In the follow screenshot why do we use this filter to our signal I ?

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Giorgos Kartsonakis le 25 Mai 2022

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Réponse apportée : Chunru le 26 Mai 2022

IMG-1514484f7d7b86a71f4764a185083f18-V.jpg

I saw this filter shown in the screenshot in SIMULINK but i can't understand the meaning of this filter. The Ts is the sample time. What changes it will cause in signal I ?

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Benjamin Thompson le 25 Mai 2022

Please try it for yourself in Simulink and if you have further questions please ask.

Giorgos Kartsonakis le 26 Mai 2022

Modifié(e) : Giorgos Kartsonakis le 26 Mai 2022

Screenshot_11.png

Thank you for your answer Benjamin.

In the screenshot i attached, the yellow signal is before the effect of filter and the blue signal after the effect of filter. I observe that the signal after the effect of filter is smoothed. But i can't understand what type of filter is and which method is used and general the purpose of this filter?.

Thank you !!!

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Answer 1

Chunru le 26 Mai 2022

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https://fr.mathworks.com/matlabcentral/answers/1727105-in-the-follow-screenshot-why-do-we-use-this-filter-to-our-signal-i#answer_971975

You have a discrete linear system. You could find the system transfer function by analysing the system. It turns out to be a first order IIR filter with one pole

. With appropriate parameter Ts (

is a function of Ts), it can be a low pass IIR filter. This explain why your output is a smoothed out version of input.