Transformig digital transferfct in analog transferfct

Question

Ann-Christin Schlupek 2022-12-8

0
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https://ww2.mathworks.cn/matlabcentral/answers/1874052-transformig-digital-transferfct-in-analog-transferfct

编辑： Bora Eryilmaz 2022-12-8

Dear MatLab Community,

is there any function to transform the coefficients of z-transfer functions into the coefficients of a s-transfer function?

I know, that there is one the other way around : the bilinear() fct, but I havent found a similar one for my problem..

Kind regards.

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Answer 1

Bora Eryilmaz 2022-12-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1874052-transformig-digital-transferfct-in-analog-transferfct#answer_1123347

编辑：Bora Eryilmaz 2022-12-8

在 MATLAB Online 中打开

Take a look at the d2c function: D2C.

% Discrete transfer function
H = tf([1 -1],[1 1 0.3],0.1)
H =
 
      z - 1
  -------------
  z^2 + z + 0.3
 
Sample time: 0.1 seconds
Discrete-time transfer function.
% Convert to continuous transfer function
Hc = d2c(H)
Hc =
 
   121.7 s + 3.668e-12
  ---------------------
  s^2 + 12.04 s + 776.7
 
Continuous-time transfer function.
% And back for confirmation
c2d(Hc,0.1)
ans =
 
      z - 1
  -------------
  z^2 + z + 0.3
 
Sample time: 0.1 seconds
Discrete-time transfer function.