section and a fuzzy inference section for receiving distortion information obtained by the controller the fuzzy inference section iteratively infers and evaluates a correction value of tap coefficients of the filter section the tap coefficient correction value is determined through fuzzy inference and the control method for counteracting disturbance coefficients to the control system is described in rules of if then form based on fuzzy levels which facilitates the organization of the control algorithm by the capability of deriving from these rules the correction value which is made continuously variable the fast control settling and the stable and flexible transmission distortion elimination operation can be accomplished application_number US 75177791 A description in fig1 numeral 1 indicates an input terminal of a television signal 2 is a filter section 3 is an output terminal of a television signal 4 is a controller and 5 is a fuzzy inference section the television signal received on the input terminal 1 is fed to the filter section 2 the filter section 2 comprises a non recursive filter expressed by the transfer function g1 z of expression 2 for example and a recursive filter expressed by the transfer function g2 z of expression 3 for example with their composite transfer function g z being expressed by expression 5 g sub 1 z k sub 0 u00b7 z sup n k sub 1 u00b7 z sup n 1 k sub n 1 u00b7 z sup 1 k sub n 2 equ2 g sub 3 z k sub n 1 u00b7 z sup 1 k sub n 2 u00b7 z sup 2 k sub n m u00b7 z sup n m 4 where z 1 exp j u03c9t t.