| 摘要 |
PURPOSE:To suppress unnecessary gain from being progressed while suppressing the absolute level of a residual distortion component in an output signal independently of the level of distortion component included in an input signal by providing leakage obtained through nonlinear conversion of a tap gain series. CONSTITUTION:A leak amount operating circuit 70 and a subtraction circuit 71 are provided additionally. The leak operation circuit 70 inputs a tap gain ci of each tap read from a tap gain memory 48 and operates the leak amount li according to prescribed equation. A tap gain correction operating circuit 47 performs tap gain correcting operation similarly as a conventional case and its output is fed to a non-inverting input of the subtraction circuit 71. An output of said leak amount operating circuit 70 is fed to an inverting input of the subtraction circuit 71. Thus, an output ci,new of the subtraction 71 is inputted again to a tap gain memory 48 as a revised tap gain. The tap gain correction as above aims at minimum residual distortion and unnecessary tap gain. |
