Transfer function from a frequency response graph

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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

Risposte (2)

Arkadiy Turevskiy
Arkadiy Turevskiy il 22 Ago 2012
Modificato: Arkadiy Turevskiy il 19 Dic 2018
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 Commento
Shmuel Nedjar
Shmuel Nedjar il 10 Lug 2017
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 il 14 Ago 2012
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)
  5 Commenti
Azzi Abdelmalek
Azzi Abdelmalek il 14 Ago 2012
when he said frequency response , that means amplitude and phase
Star Strider
Star Strider il 15 Ago 2012
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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