# Designing a Notch Filter

Started by ●February 12, 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

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

Posted by ●February 16, 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 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

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

Posted by ●February 17, 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 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

--

Abdul Wahab

Eiman Emad Mostofi

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

--

Abdul Wahab

Eiman Emad Mostofi