LOW PHASE LOSS COMPATIBLE NONLINEAR FREQUENCY BAND PASS FILTER

摘要

PURPOSE: To provide the filter device which is formed preferably in phase loss for individual application examples and automatically meet replacing driving conditions against variation of a disturbance signal component by using a linear transmission circuit which is the combination of nonlinear transmission elements and a dead zone circuit. CONSTITUTION: In a nonlinear adaptive filter, an input signal f1 (t) to be filtered is a parallel branch and inputted to the input terminal of an adjustable dead zone circuit 301 and a band pass filter 302. The output signal fD(t) of the band pass filter is inputted to a dead zone circuit 301 which shifts the original N by an adjustment value ΔN and also to an addition means 303. The addition means 303 adds and couples the signal fD(t) to the output signal fT(n) of the dead zone circuit to obtain a filter output signal f2 (t). The origin adjustment of the dead zone circuit 301 is replaced with the generation of the difference between the filter input signal f1 (t) and the output signal fD(t) of the band pass filter.