Filtering a signal
in [Matlab]
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From: Alan on 31 May 2010 06:52 Hello, I have a signal (fs=50,000Hz) that has vibrations at various different frequencies. I need to get rid of vibrations at a specific frequency (86.2Hz), but I am unsure how to do this. I have tried using a bandstop frequency from the fdatool but have so far been unsuccesful. I am new to filters (especially in matlab), so if somebody could explain what the various inputes in the fdatool mean, that would be greatly appreciated. Thank you
From: us on 31 May 2010 07:00 "Alan " <a.barth(a)sms.ed.ac.uk> wrote in message <hu04cj$cse$1(a)fred.mathworks.com>... > Hello, > > I have a signal (fs=50,000Hz) that has vibrations at various different frequencies. I need to get rid of vibrations at a specific frequency (86.2Hz), but I am unsure how to do this. I have tried using a bandstop frequency from the fdatool but have so far been unsuccesful. I am new to filters (especially in matlab), so if somebody could explain what the various inputes in the fdatool mean, that would be greatly appreciated. > > Thank you do not simply repeat your OPs... http://www.mathworks.com/matlabcentral/newsreader/view_thread/283496#750355 us
From: Alan on 31 May 2010 07:08 "us " <us(a)neurol.unizh.ch> wrote in message <hu031g$h40$1(a)fred.mathworks.com>... > "Alan " <a.barth(a)sms.ed.ac.uk> wrote in message <hu02m8$ope$1(a)fred.mathworks.com>... > > Hello, > > > > I am working on a project where I need to analyse a signal, which has a number of frequencies of vibration. I need to remove a specific frequency (86.2Hz) from the signal, but as I am new to using filters in Matlab, I am unsure how to do this. I have attempted to use the bandstop filter in the fdatool feature, but have not been succesful so far with this, mainly because I am unsure of the exact meaning of the various inputs in the tool. > > > > Any help would be greatly appreciated > > a hint: > - you'll find very good help at... > > http://www.mathworks.com/access/helpdesk/help/toolbox/signal/br179zi-1.html > > us Thanks, that does help a bit. I was wondering if you could answer me something else though. I have designed the filter in fdatool, and when I try to export it to the workspace, it exports two variables, an SOS matrix (SOS) and Scale values (G). After these are exported, how do I apply the filter to my signal? When I have used filters before, the variables have been vectors, rather than matrices
From: Alan on 31 May 2010 07:10 "us " <us(a)neurol.unizh.ch> wrote in message <hu04s5$djt$1(a)fred.mathworks.com>... > "Alan " <a.barth(a)sms.ed.ac.uk> wrote in message <hu04cj$cse$1(a)fred.mathworks.com>... > > Hello, > > > > I have a signal (fs=50,000Hz) that has vibrations at various different frequencies. I need to get rid of vibrations at a specific frequency (86.2Hz), but I am unsure how to do this. I have tried using a bandstop frequency from the fdatool but have so far been unsuccesful. I am new to filters (especially in matlab), so if somebody could explain what the various inputes in the fdatool mean, that would be greatly appreciated. > > > > Thank you > > do not simply repeat your OPs... > > http://www.mathworks.com/matlabcentral/newsreader/view_thread/283496#750355 > > us Sorry, I am new here and I didn't think my original thread had submitted properly, so I tried to submit it again
From: Wayne King on 31 May 2010 08:10 "Alan " <a.barth(a)sms.ed.ac.uk> wrote in message <hu05ed$k2b$1(a)fred.mathworks.com>... > "us " <us(a)neurol.unizh.ch> wrote in message <hu04s5$djt$1(a)fred.mathworks.com>... > > "Alan " <a.barth(a)sms.ed.ac.uk> wrote in message <hu04cj$cse$1(a)fred.mathworks.com>... > > > Hello, > > > > > > I have a signal (fs=50,000Hz) that has vibrations at various different frequencies. I need to get rid of vibrations at a specific frequency (86.2Hz), but I am unsure how to do this. I have tried using a bandstop frequency from the fdatool but have so far been unsuccesful. I am new to filters (especially in matlab), so if somebody could explain what the various inputes in the fdatool mean, that would be greatly appreciated. > > > > > > Thank you > > > > do not simply repeat your OPs... > > > > http://www.mathworks.com/matlabcentral/newsreader/view_thread/283496#750355 > > > > us > > Sorry, I am new here and I didn't think my original thread had submitted properly, so I tried to submit it again Alan, in your other post you indicated that you had successfully exported a filter object, but were confused by the second-order sections structure. Is this still the case, or are you having other difficulties with fdatool? Wayne
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