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

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Giorgos Kartsonakis 2022-5-25

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回答： Chunru 2022-5-26

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 2022-5-25

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

Giorgos Kartsonakis 2022-5-26

编辑：Giorgos Kartsonakis 2022-5-26

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 2022-5-26

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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.