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From: | Shaun Jackman |
Subject: | Re: Designing a first-order IIR filter |
Date: | Mon, 6 Nov 2006 20:02:49 -0700 |
On 11/6/06, Paul Kienzle <address@hidden> wrote:
On Nov 6, 2006, at 7:32 PM, Shaun Jackman wrote: > I can use the `freqz' function to find the cutoff > (-20 dB) frequency for a given filter, specified > by its IIR coefficients and sampling period. However, > if I have a desired cutoff frequency and given > sampling period, how do I find the IIR coefficients > that give the desired first-order filter? octave-forge has butter, cheby1, cheby2 and ellip for designing IIR filters.
Thank you. These are all very good suggestions. I am particularly interested in designing a first-order filter. I believe the above filters are exclusively higher-order -- please correct me if I'm wrong. Or can one (all?) of the above be used to design a first-order filter? Thanks, Shaun
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