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suggestions for highpass filter design in Matlab

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Stefan
Stefan 2013-12-2
评论： Stefan 2013-12-6
Hello,
I want to implement a digital highpass filter in Matlab which should do the same job as simple analog filter(a RC filter) having a cutoff frequency of 0.5Hz ans sampling frequency needed is 500Hz. I got the similar in this thread
d = fdesign.highpass('Fst,Fp,Ast,Ap',0.5,0.6,40,1,500);
Hd = design(d,'butter');
Is this the correct of way of implementation or does it need any changes I mean if the need is to implement a digital filter that can act similar to the analog filter.
Thanks.

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Wayne King
Wayne King 2013-12-3
编辑：Wayne King 2013-12-3
Yes, that looks fine as long as you realize that you have essentially an allpass filter since you are such a low stopband frequency
d = fdesign.highpass('Fst,Fp,Ast,Ap',0.5,0.6,40,1,500);
Hd = design(d,'butter');
fvtool(Hd)
You can also use butter() to design the filter in the analog domain directly in radians/second.
N = 30;
[B,A] = butter(N,pi,'high','s');
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Stefan
Stefan 2013-12-6
Wayne, When I tried to implement the above filter in fdatool,a warning message as appeared as shown below
Can you help me to figure out the problem. Thanks.

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