Re: Butterworth filter
- To: mathgroup at smc.vnet.net
- Subject: [mg108381] Re: Butterworth filter
- From: "Nasser M. Abbasi" <nma at 12000.org>
- Date: Mon, 15 Mar 2010 05:03:21 -0500 (EST)
- References: <hnkfa8$po0$1@smc.vnet.net>
"Luigi B" <l.balzano at gmail.com> wrote in message news:hnkfa8$po0$1 at smc.vnet.net... > Dear All, > I have a table {{x,y}} of measured data with significant noise. > I am not into signal processing and I would like to filter this table > with a Butterworth type of filter. > Does anyone have a suitable routine? (That would allow changin the > order of the filter as well, like the function 'butter' in another > system). > > Thanks, Luigi > > This is not much help to you now, but there used to be a Mathematica add-on application called signals and systems which had this and more filters: http://documents.wolfram.com/applications/signals/FilterAnalysisandDesign.html Too bad this application is no longer available. I have version 1.0 bought few years ago, which no longer works on version 7 of Mathematica (I get many error messages when I load it). If you google more may be you'll find something. When all else fails, it might be a good exercises to write one yourself. --Nasser