How can I find filter coefficients?

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Andrew
Andrew on 16 Apr 2013
Hello community,
I've designed a butterworth filter:
h = fdesign.bandstop('fp1,fst1,fst2,fp2,ap1,ast,ap2', Fpass1, Fstop1, ...
Fstop2, Fpass2, Apass1, Astop, Apass2, Fs);
Hd = design(h, 'butter', ...
'MatchExactly', 'stopband', ...
'SOSScaleNorm', 'Linf');
This filter has a phase shift so I need to shift phase. As I know, I have to apply filtfilt, but for this I have to know filter coefficients. How can I get them?
Thanks in advance.
Andrew

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