Adaptive equalization system for nonlinearities

An adaptive equalization system for nonlinearities comprising,

• (a) an input terminal receiving an input signal, an output terminal providing an equalized output signal, and a circuit to be equalized inserted between the input terminal and the output terminal,
• (b) an equalization circuit connected in series with that circuit to be equalized, having a series circuit with a distortion generator for providing the high order distortion, a variable phase shifter for shifting the phase of the output signal of said distortion generator and a variable attenuator for adjusting the amplitude of the output signal of the distortion generator, and a delay means connected parallel to that series circuit so that the delay time in that delay means is equal to the delay time in said series circuit,
• (c) a distortion detector connected to the output terminal of the adaptive equalization system for detecting the noise level in the predetermined narrow frequency band, and
• (d) a distortion control circuit connected to the output of said distortion detector for controlling said variable phase shifter and said variable attenuator so that the distortion detected by said distortion detector becomes minimum.