remove a specific frequency from emg signal
in [Matlab]
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From: Wayne King on 9 Aug 2010 15:06 "Debora " <debi_can(a)yahoo.com.br> wrote in message <i3pj0j$30v$1(a)fred.mathworks.com>... > Hi, Wayne. > > This is actually driving me insane. I do not have the necessary knowledge to understand the parameters, so I can't change what you wrote to make it work. > > You design - thank you for that - filtered all the signal and did not remove the low frequencies. > > I really don't wanna bother, but I do not know what to do. > > Debi > > "Wayne King" <wmkingty(a)gmail.com> wrote in message <i3pcng$hn8$1(a)fred.mathworks.com>... > > "Debora " <debi_can(a)yahoo.com.br> wrote in message <i3pbpg$i0f$1(a)fred.mathworks.com>... > > > > > > > > Hi Debora, Yes, you can highpass filter the signal, removing everything below 5 Hz. What is your sampling frequency? > > > > > > > > Wayne > > > > > > Hi, Wayne > > > > > > My data was collected using 2000 Hz. > > > > > > Debi > > > > Debi, you can use fdesign.highpass and design() to design your filter. > > > > h = fdesign.highpass('Fst,Fp,Ast,Ap',20,25,60,1,2000); > > d = design(h,'butter'); > > % visualize your filter > > fvtool(d) > > > > Removes frequencies below 20 hertz. > > > > Do you need to implement zero-phase filtering? If not, you can implement your filter as: > > > > output = filter(d,input); > > > > Wayne Debi, can you send me an example .mat file? Wayne
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