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What is the difference equation of a Butterworth filter?

• To: mathgroup at smc.vnet.net
• Subject: [mg27380] What is the difference equation of a Butterworth filter?
• From: Elias Kyriakides <elias_kyriakides at hotmail.com>
• Date: Thu, 22 Feb 2001 02:25:26 -0500 (EST)
• Organization: Arizona State University
• Sender: owner-wri-mathgroup at wolfram.com

Can anybody provide me with the difference equation of a Butterworth
filter?
e.g. something like y[n] = a1x[n] +a2x[n-1] etc

Thanks,
Elias