Talk:Strictly proper

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[edit] Frequency response approaches zero?

I question the statement:

A strictly proper transfer function will approach zero as the frequency approaches infinity.

which is true for all physical processes.

For example, a simple differentiator, such as a voltage-driven capacitor or a velocity-driven mass, has an improper transfer function and therefore an infinite frequency response at infinity.Roesser 14:37, 27 July 2007 (UTC)