| 摘要 |
PURPOSE:To prevent the tap gain correcting control of an automatic equalizer from being diverged and also to minimize the residual distortion by providing always required minimum leakage to the tap gain correcting control independently of the state of distortion of an input signal. CONSTITUTION:All tap gains {Ci} are read once from a tap gain memory 48 at first in a tap gain correcting operation circuit 47 and Equation (C0; tap gain of main tap, Ci; tap gain of the i-th tap) is operated by an absolute sum circuit 53. In order to prevent the divergence of the tap gain correcting operation, a minute leakage is provided in the tap gain correction control so as to obtain a new tap gain, and when this leakage value A exceeds a reference value A0, the leakage value is increased in proportion to (A-A0) and when the value is the reference value A0 or below, the leakage value is used. The gain leakage control is conducted by providing a leakage so that the main tap where the tap gain is maximized is directed to a predetermined value and taps other than the main tap are zeroed respectively.
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