| 摘要 |
An automatic equalizer comprises a transversal filter (2) for receiving an input signal (X(t)) to be equalized and having adjustable tap gains, a circuit (3) connected to receive an output signal of the transversal filter and the input signal to be equalized to produce an equalized output signal (Y(t)), a distortion detect circuit (5) for detecting a distortion component included in the output signal, a tap gain correct circuit (6) connected to receive a distortion detect signal from the distortion detect circuit to produce tap gain correct signals, and a tap gain hold circuit (7) responsive to the tap gain correct signals to correct the tap gains of the transversal filter and hold the corrected tap gains. In order to eliminate the influence of DC offset component at the output of the distortion detect circuit on the signal equalization, a polarity inverting circuit (8, 9, 10, 11) is provided for synchronously and periodically inverting the polarity of a signal component included in the output signal of the distortion detect circuit and the polarity of the tap gain correct signals. |
