notch filter is as like as bandstop filter but very sharp on cutoff freq, like
when you want to damp 50Hz or 60Hz noise from signal.

ya Ali

Abdul Wahab wrote:

Sorry I cant undestand urs Question

I m also student of electrical engineering but i donot read any notch filter
till now

Thnks

Abdul wahab

On 2/16/08, emilly wrote: you can use MatLab
functions like butter(butter worth), cheby1 ,cheby2 (Chebyshev Type I & II),
etc

for exp for a bandstop filter like 50Hz notch:

fs = 1000;% sampling frequency

deg = 3;%filter deg

Wn = [45*2/fs,55*2/fs];

[B,A] = butter(deg,Wn,'stop');

filteredSignal = filter(B,A,signal);

maha devi wrote:

Hi friends,

I need to design a notch filter using matlab..

can anyone tell me if any inbuilt command is available for designing a notch
filter in matlab.how can i specify the frequency which should be attenated and
the bandwidth of notch????

also, i need to design a FIR FILTER using window method. Can i use FDATOOL for
designing it...If so..where should i mention the Number of taps and window size
in FDA designing window???

Awaiting ur reply...

Thanks and Regards,

Mahadevi

Eiman Emad Mostofi

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Abdul Wahab

Eiman Emad Mostofi