| 摘要 |
<p>An automatic drift control circuit which automatically corrects the drift of a multi-level demodulated signal is disclosed. In a case where the drift of a multi-level signal is comparatively small, the error signal of signals of each decision level is integrated and is added to the demodulated signal. When it is detected that the drift has become large by monitoring the decision condition, the integrated output selectively using the error signal of the signal in the specified range including the signal which is at least higher than the highest level and the signal which is lower than the lowest level is added to the demodulated signal. Thereby, pseudo pulling can be prevented.</p> |
