| 摘要 |
PURPOSE:To realize an automatic equalizer in which a characteristic change is very little and stability is excellent at the time of the completion of the training and at the time of communication by detecting, by an estimation value detecting circuit from the above-mentioned equalizer circuit output, the estimation value to estimate whether or not the equalizer circuit output is a signal which can identify the correct data and comparing with the reference value. CONSTITUTION:An estimation value to estimate the equalizing condition from an output signal is detected by an estimation value detecting circuit, the output of the said detecting circuit 4 and a reference value (1) of a reference value generating device 12 are compared by a comparing circuit 13, and a reference value (2) of a reference value generating device 14 is compared by a comparing circuit 15. When the estimation value of the estimation value detecting circuit 4 is smaller than the reference value (1), an equalizing characteristic is changed to the direction to increase the estimation value, when the above-mentioned estimation value is larger than the reference value (2), the equalizing characteristic is changed to the direction to decrease the estimation value, and when the estimation value is larger than the reference value (1) and smaller than the reference value (2), the equalizing characteristic is not changed.
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