- From: Sandy Pond <sandy_pond_at_myrealbox.com>
- Date: Sun, 06 Mar 2005 22:07:06 -0500
On Sun, 2005-03-06 at 18:32 -0500, Daniel Nilsson wrote: > I've been playing with different kinds of filters to compare > performance, while doing so I found that I could create an IIR filter > with a relatively small order (4 for example) that would act as a very > efficient low-pass filter. To get the same characteristics using an > FIR filter I had to create a much higer order (>30), this makes sense > to me. Correct me if I'm wrong... Although your question wasn't directed to me I suggest you try comparing to a 4 order of the low_pass_filter.c I posted before. I attached an example2_low_pass_filter.c which uses 4 poles. > > From reading various FAQs I find that one of the concerns with IIR > filter over FIR filters is stability. Would that be a concern in an > application where I use samples from Comedi ? > Since the low_pass_filter.c has no zeros it's always stable and guarantied to have unity steady state gain. The code is very efficient as well. Regards
Received on 2005-03-07Z03:07:06