From help-octave-request at bevo dot che dot wisc dot edu Fri Dec 7 10:35:00 2001 Subject: need help filtering a signal From: Philipp Schwaha To: help-octave at bevo dot che dot wisc dot edu Date: Fri, 7 Dec 2001 17:34:29 +0100 hi! what i need to do is fiter a signal to remove noise. what i wanted to try first was a fft then cut all frequencies except the the important ones (e.g 100Hz, 200Hz ...), but when i did the fft i did not know how to do this, since there are no frequencies associated with the values the function fft returns. this is the first time i try to do something using an fft. then i discovered the function fftfilter, but i could not make it produce the results i wanted. how can i remove all frequencies from a certain signal, except a few selected ones? thanks philipp ------------------------------------------------------------- Octave is freely available under the terms of the GNU GPL. Octave's home on the web: http://www.octave.org How to fund new projects: http://www.octave.org/funding.html Subscription information: http://www.octave.org/archive.html -------------------------------------------------------------