[Eeglablist] Filter length

[Jingjiang Lei]

Hi Anna,

The are a few thing you much keep in mind about filter length of FIR
filter. For IIR filter the filter length is very short. The fellowing
is only for FIR filter. First the longer filter length will take more
time to filter data. Second the runoff of filter will be steeper when
using longer filter length. Different people like different filter
shap. Third the filter length should be 3 times longer than the cutoff
wave length.

Thanks,

Jingjiang


On Thu, 18 Mar 2004 10:14:19 -0000
 "A P Basu" <A.P.Basu at newcastle.ac.uk> wrote:
> Can anyone help explain the advantages or disadvantages of having a
> long
> or short filter length?
> 
> With thanks
> 
> Dr Anna Basu
> Clinical Research Associate
> School of Clinical Medical Sciences 
> (Child Health)
> Sir James Spence Institute
> Royal Victoria Infirmary
> Newcastle upon Tyne
> NE1 4LP
> Tel: 0191 202 3033 ext 43102
> 
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