| 摘要 |
PURPOSE:To reproduce previous data from coded data by the NRZ method, by discriminating between ''0'' and ''1'' of data properly by setting the threshold voltage of a comparator near the cross point of the eye pattern of data. CONSTITUTION:A signal coded in the NRZ method, recorded and transmitted is supplied to input terminal 1 and then applied to comparators 10 and 11 via signal processing circuit 9. The threshold voltage applied to the inversion terminal of comparator 10 is set to a value near the cross point of the eye pattern of data from the automatic control circuit consisting of D type FFs F2 and F3, inverter 12, AND circuits 13 and 14, current source circuits 21 and 22, capacitor 23, etc. Further, a reference signal from terminal 13 is added to the threshold voltage of comparator 11 and the sum is inputted to synchronous separating circuit SEP. Then, comparator 10 is enabled to discriminate between ''0'' and ''1'' of data easily and accurately, and the data coded in the NRZ method is restored to the original data. |
