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Re: Designing a first-order IIR filter

From: Paul Kienzle
Subject: Re: Designing a first-order IIR filter
Date: Mon, 6 Nov 2006 21:17:24 -0500

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.

- Paul

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