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
采纳的回答
Honglei Chen
2014-9-19
dsp.BiquadFilter is a System object, so its main method is step(). Try
a = step(Hd,a)
1 个评论
Gustavo Machado
2019-6-10
编辑：Gustavo Machado
2019-6-10
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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