how to get filter coefficients after designing filter in FDA tool

Question

Stefan 2013-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/109943-how-to-get-filter-coefficients-after-designing-filter-in-fda-tool

编辑： Stefan 2013-12-17

Hello, I have designed a bandpass filter as suggested here as below

   d = fdesign.bandpass('Fst1,Fp1,Fp2,Fst2,Ast1,Ap,Ast2',0.5,1,3,4,80,0.5,80,50);
   Hd = design(d,'butter');

here but with fda toool and now I need only the filter coefficients as they will be used for designing filter microcontroller. I am confused with the two options available with the export

1)objects:results 'Hd' variables in the workspace

2)coefficients:results G,SOS variables in the workspace

Which one should I use and how to get and see only the original filters coefficients so that I can copy them into notepad.

Can anyone explain about this. Thanks.

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Answer 1

Honglei Chen 2013-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/109943-how-to-get-filter-coefficients-after-designing-filter-in-fda-tool#answer_118547

If you want the coefficients, you should use second option, "coefficients".

If you choose first option, you get a filter specified in Hd. You can perform the filtering operation by calling filter(Hd,x), but Hd itself is an object describing the filter. It is more than the mere filter coefficients.

HTH