Transfer function from a frequency response graph

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Rodrigo Trigona
Rodrigo Trigona 2012-8-14
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

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回答（2 个）

Arkadiy Turevskiy
Arkadiy Turevskiy 2012-8-22
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
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Shmuel Nedjar
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

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Azzi Abdelmalek
Azzi Abdelmalek 2012-8-14
i suggest:
  1. from your frequency response, calculate a temporel pulse response h(t) (it's the inverse Fourier transform of your frequency response
  2. choose a white band signal x(t), and calculate y(t)=x(t)*h(t) (* is convolution).
  3. from x and y identify your transfer function (you must know the order of your system which is given by your frequency response)
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Azzi Abdelmalek
Azzi Abdelmalek 2012-8-14
when he said frequency response , that means amplitude and phase
Star Strider
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.

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