describing function

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describing function [di′skrīb·iŋ ‚fəŋk·shən]

(control systems)

A function used to represent a nonlinear transfer function by an approximately equivalent linear transfer function; it is the ratio of the phasor representing the fundamental component of the output of the nonlinearity, determined by Fourier analysis, to the phasor representing a sinusoidal input signal.

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