Butterworth filter
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From: Luigi B on 15 Mar 2010 01:07 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
From: Nasser M. Abbasi on 15 Mar 2010 06:03 "Luigi B" <l.balzano(a)gmail.com> wrote in message news:hnkfa8$po0$1(a)smc.vnet.net... > Dear All, > I have a table {{x,y}} of measured data with significant noise. > I am not into signal processing and I would like to filter this table > with a Butterworth type of filter. > Does anyone have a suitable routine? (That would allow changin the > order of the filter as well, like the function 'butter' in another > system). > > Thanks, Luigi > > This is not much help to you now, but there used to be a Mathematica add-on application called signals and systems which had this and more filters: http://documents.wolfram.com/applications/signals/FilterAnalysisandDesign.html Too bad this application is no longer available. I have version 1.0 bought few years ago, which no longer works on version 7 of Mathematica (I get many error messages when I load it). If you google more may be you'll find something. When all else fails, it might be a good exercises to write one yourself. --Nasser
From: Luigi B on 17 Mar 2010 05:41 On Mar 15, 11:03 am, "Nasser M. Abbasi" <n...(a)12000.org> wrote: > "Luigi B" <l.balz...(a)gmail.com> wrote in message > > news:hnkfa8$po0$1(a)smc.vnet.net... > > > Dear All, > > I have a table {{x,y}} of measured data with significant noise. > > I am not into signal processing and I would like to filter this table > > with a Butterworth type of filter. > > Does anyone have a suitable routine? (That would allow changin the > > order of the filter as well, like the function 'butter' in another > > system). > > > Thanks, Luigi > > This is not much help to you now, but there used to be a Mathematica add-on > application called signals and systems which had this and more filters: > > http://documents.wolfram.com/applications/signals/FilterAnalysisandDe... > > Too bad this application is no longer available. > > I have version 1.0 bought few years ago, which no longer works on version 7 > of Mathematica (I get many error messages when I load it). > > If you google more may be you'll find something. When all else fails, it > might be a good exercises to write one yourself. > > --Nasser Dear Nasser thank you for your message. However, it does not solve my problem. L
From: Tyler on 18 Mar 2010 06:16 On Mar 15, 6:03 am, "Nasser M. Abbasi" <n...(a)12000.org> wrote: > "Luigi B" <l.balz...(a)gmail.com> wrote in message > > news:hnkfa8$po0$1(a)smc.vnet.net... > > > Dear All, > > I have a table {{x,y}} of measured data with significant noise. > > I am not into signal processing and I would like to filter this table > > with a Butterworth type of filter. > > Does anyone have a suitable routine? (That would allow changin the > > order of the filter as well, like the function 'butter' in another > > system). > > > Thanks, Luigi > > This is not much help to you now, but there used to be a Mathematica add-= on > application called signals and systems which had this and more filters: > > http://documents.wolfram.com/applications/signals/FilterAnalysisandDe... Wow. Just checked that package out. It really IS a shame it is no longer offered. I would've loved to have that package at my disposal....
From: Paul Floyd on 19 Mar 2010 03:46 On Mon, 15 Mar 2010 10:03:35 +0000 (UTC), Nasser M. Abbasi <nma(a)12000.org> wrote: > "Luigi B" <l.balzano(a)gmail.com> wrote in message > news:hnkfa8$po0$1(a)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). > > 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. Hi I'd be interested in this as well. Do you know who produced it, and whether it'd be possible to get it working again with Mathematica 7? A bientot Paul
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