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Discussion Groups | Matlab DSP | Designing a Notch Filter


Technical discussion about Matlab and issues related to Digital Signal Processing.

  

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Designing a Notch Filter - maha devi - Feb 12 15:19:38 2008

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





Re: Designing a Notch Filter - emilly - Feb 16 7:29:50 2008

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 





Re: Designing a Notch Filter - emilly - Feb 17 18:55:55 2008

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