| 摘要 |
PURPOSE:To attain data separation where error rates are possibly decreased by forming a reference slice level signal from a reproducing signal and controlling the level of the slice signal with a delay output of a slice output. CONSTITUTION:A slice level signal when a reproducing signal is sliced by a comparator 21 as a slice means is detected and produced from the reproducing signal. In this case, diodes Di-1, Di-2 and capacitors C1, C2 hold positive and negative levels +Vref, -Vref and the nearly center level is used as the slice level Vref'. This is conducted by analog switches SW-1, SW-2 as the slice level control means and the control of the SW-1, SW-2 is executed by the output of a D-FF 22 as a delay synchronization extracting means. Even when an eye pattern to each positive/negative peak is deviated from the center, the slide level Vref' is controlled to be the center of the eye pattern. |
