How to build a filter from frequency response

Question

Alecsander Eitan 2014-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/140922-how-to-build-a-filter-from-frequency-response

回答： Alecsander Eitan 2014-7-8

Hi, I have measurements of a system that is frequency selective (it has several cascaded filters). I would like to build an IIR (FIR is also possible) that has similar frequency response as the measurements. I don't have the group delay or phase information, however I know that there are few simple analog filters in the chain. Thanks, Alecs

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Answer 1

Honglei Chen 2014-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/140922-how-to-build-a-filter-from-frequency-response#answer_144189

You can use fdesign.arbmag to do this. The reference page has several examples.

http://www.mathworks.com/help/signal/ref/fdesign.arbmag.html

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Answer 2

Alecsander Eitan 2014-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/140922-how-to-build-a-filter-from-frequency-response#answer_144217

Thank you. It works but only for symmetric magnitude. I have shifted the filter to be around 0.5 and increased Fs by 2. It enabled asymmetric BPF. The only drawback I have is that since I use IIR filter, it is not possible to shift the filter back to 0, I have to shift the signal up and down. Bottom line: it works!