IIR vs. FIR filters
IIR vs. FIR filters
- Subject: IIR vs. FIR filters
- From: Ian Ollmann <email@hidden>
- Date: Tue, 10 Dec 2002 09:51:44 -0800
Hi Friends,
I've noticed that there is a very large difference between
calculation efficiency between IIR and FIR filters. Many simple IIR
filters cant take advantage of pipelining and are also not vectorizable.
So, take into account only one multiply-add per 5 cyles and no
vectorization, and one quickly arrives at the conclusion that you can do
20 times as many multiply-adds per unit time in the context of a FIR
filter compared to what you can do in an IIR filter! The difference is
just going to get bigger as the FPU pipelines get longer.
So, given all of that, I am a bit curious whether there are any
technologies for converting IIR filters to FIR filters with similar
frequency response.
Cheers,
Ian Ollmann
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Ian Ollmann, Ph.D. email@hidden
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