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Re: Digital Filters

• To: mathgroup at smc.vnet.net
• Subject: [mg27261] Re: Digital Filters
• From: vze295bp at verizon.net (David Reiss)
• Date: Wed, 14 Feb 2001 03:41:28 -0500 (EST)
• Organization: Scientific Arts
• References: <96aslc$6fo@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In article <96aslc$6fo at smc.vnet.net>, "Lemiel Maya" <lemiel at nomade.fr> wrote:

> I am interested in using MATHEMATICA to design digital filters via the
> window method (hamming, Hanning).  Can anybody out there give me an idea of
> how to go about designing a simple lowpass filter.
> Your help will be appreciated

Here is an example of using a low pass filter to "denoise" 
some data:

http://www.scientificarts.com/sunspotanalysis/sunspotanalysis.html

You might use this as a starting point for the
use of the ListConvolve function in the construction
of more involved linear filters.  Note also that 
ListConvolve can be used in a much more generalized 
way to implement nonlinear filters as well.

--David

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