To obtain an adaptive equalizer, capable of preventing identification accuracy of a linear element from being reduced by the existence of a non-linear element in a transfer function.
In a first signal converter 101 to a second signal converter 106, a filter coefficient represented in a frequency domain is held, and based on the filter coefficient, adaptive learning is performed from an input signal of a target unknown system and an output signal of the unknown system, to identify a transfer function of the unknown system. A frequency weight processor 107 multiplies the filter coefficient or the updated amount of the filter coefficient in a filter processor 102 with a weight, on the basis of non-linear distortion characteristic information about non-linear distortion characteristics of the unknown system held in a non-linear distortion characteristic information holder 108.
Hamada Hatsune
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