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

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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 <m...@gmail.com> 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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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 <w...@gmail.com> 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 <c...@yahoo.com> 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 <m...@gmail.com> 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

-- 
Abdul Wahab 
Eiman Emad Mostofi

______________________________
New Code Sharing Section now Live on DSPRelated.com. Learn about the Reward Program for Contributors here.



(You need to be a member of matlab -- send a blank email to matlab-subscribe@yahoogroups.com )