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From: | Doug Stewart |
Subject: | Re: Designing a first-order IIR filter |
Date: | Mon, 06 Nov 2006 22:23:14 -0500 |
User-agent: | Thunderbird 1.5.0.7 (Windows/20060909) |
Shaun Jackman wrote:
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?
Just give it a try. It works. Doug
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