From help-octave-request at bevo dot che dot wisc dot edu Fri Dec  7 12:56:36 2001
Subject: Re: need help filtering a signal
From: Paul Kienzle <pkienzle at jazz dot ncnr dot nist dot gov>
To: Philipp Schwaha <e9725959 at student dot tuwien dot ac dot at>,        help-octave@bevo.che.wisc.edu
Date: Fri, 7 Dec 2001 13:54:40 -0500

A implementation of the remez filter is available in octave-forge
(http://octave.sf.net) along with other filter construction
tools such as fir2.

Paul Kienzle
pkienzle at users dot sf dot net

On Fri, Dec 07, 2001 at 05:34:29PM +0100, Philipp Schwaha wrote:
> 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
> -------------------------------------------------------------
> 



-------------------------------------------------------------
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
-------------------------------------------------------------