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Need help in designing a filter which removes all 1 Hz frequencies.

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suresh
suresh 2012-5-28
I have white noise from this white noise i want to remove all 1 Hz frequencies using LPF
In matlab how can be design a LPF with 1Hz cutoff freq

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采纳的回答

Wayne King
Wayne King 2012-5-28
There are many ways. You have not told us your sampling frequency. Let me assume it is 60-Hz.
d = fdesign.lowpass('Fp,Fst,Ap,Ast',1,3,0.5,40,60);
Hd = design(d);
% View filter magntidue response
fvtool(Hd)
% to filter data
output = filter(Hd,inputdata);
  1 个评论
suresh
suresh 2012-5-29
sir, what if my sampling frequency is 0.0333 Hz
my cutoff frequency is 1Hz
output = filter(Hd,inputdata);
above equation will remove all 1Hz frequencies from input data
pls help

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更多回答（1 个）

Wayne King
Wayne King 2012-5-29
I answered this in your other post. If your sampling frequency is 0.0333 Hz, then you cannot resolve 1 Hz.

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