Re: Butterworth filter
- To: mathgroup at smc.vnet.net
- Subject: [mg108425] Re: Butterworth filter
- From: Luigi B <l.balzano at gmail.com>
- Date: Wed, 17 Mar 2010 04:40:16 -0500 (EST)
- References: <hnkfa8$po0$1@smc.vnet.net> <hnl0ln$6uq$1@smc.vnet.net>
On Mar 15, 11:03 am, "Nasser M. Abbasi" <n... at 12000.org> wrote: > "Luigi B" <l.balz... at gmail.com> wrote in message > > news:hnkfa8$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/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