To settle such problems that the residual distortion is increased when a polygonal line approximation is used as a nonlinear compensation circuit, the circuit is complicated when a squaring unit is used and also the tertiary distortion, of which quantity is large, is newly generated.
This nonlinear compensation circuit is provided with an inverse byperbolic function generation circuit 22 which converts the differential currents corresponding to input signals in+ and in- into the differential voltage that are proportional to an inverse hyperbolic function, an offset giving circuit 23 which gives the offsets corresponding to control voltage c+ and c- to the differential voltage converted by the circuit 22 and a hyperbolic function generation circuit 25 which converts the differential voltage given from the circuit 23 into the output signals out+ and out- proportional to a hyperbolic function. Thus, the nonlinear compensation circuit performs the nonlinear compensation of the secondary distortion, etc., to the read signal sent from a recording medium.
SUGITA JUNKICHI
SHOJI NORIO
SEKINE MASATO
SENBA KIMIMASA
OBI YOSHIHISA
