Transfer function from a frequency response graph

91 次查看（过去 30 天）

Rodrigo Trigona 2012-8-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46012-transfer-function-from-a-frequency-response-graph

编辑： Arkadiy Turevskiy 2018-12-19

I want to know if exist some MATLAB function that can give me a transfer function by analysis from points of a frequency response graph

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Arkadiy Turevskiy 2012-8-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46012-transfer-function-from-a-frequency-response-graph#answer_56889

编辑：Arkadiy Turevskiy 2018-12-19

System Identification Toolbox is an add-on to MATLAB for estimating transfer functions as well as other model types from time or frequency domain data.

You can estimate a transfer function from frequency domain data using the function tfest from this toolbox.

Here is a demo that might be helpful. The demo is using ssest for estimating state-space models, but you can definitely use tfest instead for estimating a transfer function.

HTH.

Arkadiy

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Shmuel Nedjar 2017-7-10

Thank you for your helpful answer, suggesting functions from the System Identification Toolbox. I was unaware of such a toolbox and appropriate functions for accomplishing this task. CJL

请先登录，再进行评论。

Azzi Abdelmalek 2012-8-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46012-transfer-function-from-a-frequency-response-graph#answer_56256

i suggest:

from your frequency response, calculate a temporel pulse response h(t) (it's the inverse Fourier transform of your frequency response
choose a white band signal x(t), and calculate y(t)=x(t)*h(t) (* is convolution).
from x and y identify your transfer function (you must know the order of your system which is given by your frequency response)

5 个评论
显示 3更早的评论隐藏 3更早的评论

Azzi Abdelmalek 2012-8-14

when he said frequency response , that means amplitude and phase

Star Strider 2012-8-15

True, but we don't know exactly what he has, or what information he can recover from the graph. My intent in my previous comment was to find that out.

请先登录，再进行评论。

请先登录，再回答此问题。