Re: Butterworth filter
- To: mathgroup at smc.vnet.net
- Subject: [mg108505] Re: Butterworth filter
- From: "Nasser M. Abbasi" <nma at 12000.org>
- Date: Sat, 20 Mar 2010 02:47:13 -0500 (EST)
- References: <hnkfa8$po0$1@smc.vnet.net> <hnl0ln$6uq$1@smc.vnet.net> <hnva5f$87t$1@smc.vnet.net>
"Paul Floyd" <root at 127.0.0.1> wrote in message news:hnva5f$87t$1 at smc.vnet.net... > On Mon, 15 Mar 2010 10:03:35 +0000 (UTC), Nasser M. Abbasi > <nma at 12000.org> wrote: >> "Luigi B" <l.balzano at gmail.com> wrote in message >> news:hnkfa8$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). >> >> 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 > My guess it came from Georgia Tech Research, if you look at this page, more information can be found about DSP for Mathematica, and I think, from looking at it, it that this is the origin of the application that WRI had on its web page: http://users.ece.utexas.edu/~bevans/projects/symbolic/spp.html I could be wrong ofcourse. Try to contact WRI. But it is not a supported application any more so good luck getting any answer. Also, I generated PDF of the documents of this application here http://12000.org/my_notes/faq/mma_notes/Mathematica_for_signal_processing.htm It will be really neat if these functions became part of Mathematica itself in version 8. I mean the code is there, so it just needs to be updated to run on Mathematica ! As I said, I can't get it to run on version 7. I did not spend time to find out why. --Nasser