= Higher-order sinusoidal input describing function
{wiki=Higher-order_sinusoidal_input_describing_function}
The Higher-order sinusoidal input describing function is a concept from control theory and nonlinear systems analysis. It extends the idea of the describing function, which is a method used to analyze nonlinear systems using harmonic balance. The basic idea behind the describing function is that a nonlinear system's response to sinusoidal inputs can be approximated in the frequency domain.
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