IIR Filter Coefficant Value

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Hamza Aykut
Hamza Aykut on 10 Jan 2022
Hello Sir / Madam
After I finisihing IIR Filter Design MATLAB shows me this coefficents window. How can I calculate coefficents value which using these informations.

Answers (2)

Star Strider
Star Strider on 10 Jan 2022
I do not have access to R2010b and I have no idea what application that is.
I would design the filter a bit differently, using command-line functions and a more efficient filter design and implementation —
Fs = 4.8E+5;
Fn = Fs/2;
Wp = [100 1.9E+5]/Fn;
Ws = Wp.*[0.95 1.05];
Rs = 50;
Rp = 1;
[n,Wn] = ellipord(Wp,Ws,Rp,Rs);
[z,p,k] = ellip(n,Rp,Rs,Wp);
[sos,g] = zp2sos(z,p,k);
FilterOrder = n
FilterOrder = 8
figure
freqz(sos, 2^16, Fs)
set(subplot(2,1,1), 'XScale','log')
set(subplot(2,1,2), 'Xscale','log')
Then use the ‘sos’ and ‘g’ outputs with the filtfilt function to do the actual signal filtering.
.

Bharath Venkataraman
Bharath Venkataraman on 10 Jan 2022
Click on File -> Export. There is an option to export the coefficients to the workspace (SOS, G will be exported as variables accessible in MATLAB).

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