Discrete low-pass filter

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lionel messi 2021-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/711648-discrete-low-pass-filter

评论： lionel messi 2021-1-11

Hi community!

I have created a Matlab function block. Then I have set its sample time equal to "Ts" (100e-6). After that I implemented a simple low-pass filter code using this block, the results are different from when I build the filter using the "1/s" and "gain" blocks of Simulink. The transfer function of the filter is:

Y/X=1/(1+sTc)

I have implemented it by applying the backward Euler discretizing method as :

Y(k)=(Ts/(Ts+Tc))X(k)+(Tc/(Tc+Ts))Y(k-1)

where X is a sinusoidal function given from outside of the Matlab function block.

Is it something wrong here?

Regards,