A method for measuring nonlinear systems having a Volterra series is presented. The Volterra series is the parallel combination of elements having series input and output filters around a power-law distortion, and may be used to represent a wide variety of systems combining filtering and memoryless distortion functions. The technique is to measure the system using a swept sinusoid at a variety of amplitudes, and to use least squares to first separate the element responses and then identify the unknown input and output filters.
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