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Designing a first-order IIR filter

From: Shaun Jackman
Subject: Designing a first-order IIR filter
Date: Mon, 6 Nov 2006 14:51:44 -0700

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?

Please cc me in your reply. Many thanks in advance,

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