error with using filter
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Hi all,
I have to filter few signals and I wrote the following code:
Fpass = 40; % Passband Frequency
Fstop = 45; % Stopband Frequency
Apass = 1; % Passband Ripple (dB)
Astop = 80; % Stopband Attenuation (dB)
Fs = 100; % Sampling Frequency
h = fdesign.lowpass('Fp,Fst,Ap,Ast', Fpass, Fstop, Apass, Astop, Fs);
Hd = design(h, 'butter','MatchExactly', 'stopband','SystemObject', true);
a=rand(1000,1);
a=filter(Hd,a);
I get the following error:
Undefined function 'filter' for input arguments of type 'dsp.BiquadFilter'.
Why do I get that error?
Thanks
Regards
Pietro
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Honglei Chen
2014년 9월 19일
dsp.BiquadFilter is a System object, so its main method is step(). Try
a = step(Hd,a)
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Gustavo Machado
2019년 6월 10일
편집: Gustavo Machado
2019년 6월 10일
Honglei, I've encountered the same problem Pietro had and used step() to apply the filter, but the filter was inefficient, seems like it didn't filter the data.
I've posted a question regards my problem. I used the sosfilt(Hd.SOSMatrix) to filter my data but came across the problem described in this topic: https://www.mathworks.com/matlabcentral/answers/466353-difference-between-fvtool-filterobject-and-fvtool-filterobject-sosmatrix
I'd highly appreaciate if you could take a look at it.
Thanks in advance,
Gustavo
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