| 摘要 |
In equalizing a reproduced signal with an equalizer having a variable equalizing characteristic, a decision as to whether or not the equalizing characteristic is to be varied is made by using the reproduced signal. For example, the frequency of performing an equalizing characteristic varying action is controlled according to an error rate in the reproduced signal. By virtue of this control, the equalizing characteristic can be quickly optimized in the event of a high error rate and, in a case where the error rate is low, the equalizing process can be stably carried out. Further, the equalizing characteristic is arranged to be varied while the level of the reproduced signal is in the neighborhood of a predetermined level, so that the equalizing characteristic can be optimized for such a signal that is most vulnerable to an adverse effect of the varying of the equalizing characteristic.
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