Extract data from fvtool output
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Hi there,
I am designing a filter using MATLAB's Filter Design Tool, however I need to verify certain data points in the response. In particular the group delay values. FVTool allows you to view the results of different responses (e.g. see following image), but I need a means of extracting the response data for further use in my code. How can I extract the group delay (or magnitude and phase) data from the filter design tool?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/157394/image.png)
How can I export that curve?
Thanks for any assistance you can offer me!
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Star Strider
2016-10-25
I don’t routinely use fvtool, so my experience with it is limited. See the section on Modifying the Plot in the fvtool documentation. That will probably let you do what you want.
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Star Strider
2016-10-25
My pleasure.
You can’t get there from here with fvtool. It’s designed to graphically let you explore the characteristics of your filter in a GUI.
Since you’ve already designed your filter, use the grpdelay, phasedelay, and related functions in the Signal Processing Toolbox to get the results you want.
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