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

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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

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

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