| 摘要 |
PURPOSE:To reproduce correctively the prescribed data including an index, etc. by reading two same data which are repetitively recorded and then processing said data with the 1st and 2nd coincidence/dissidence signals and a drop-out detecting signal. CONSTITUTION:The 1st index data signal is supplied to a counter 18; while the 1st signal is stored in a data memory 21. The counter 18 switches a switch 11, and the 2nd signal is supplied to a comparator 22. The comparator 22 delivers ''L'' when the 1st signal is coincident with the 2nd signal. An AND circuit 17 transmits a signal of ''L'' after deciding that the 2nd data is correct, and the 2nd data is delivered via a delay circuit 25. When the comparator 22 decides the dissidence, a drop-out detector 7 is set at ''L'' as long as no 2nd drop-out exists. Then the circuit 17 decides that the 2nd data is correct. In this case, if a drop- out is detected, the output of the detector 7 is set at ''H''. Then the circuit 17 decides the 1st data correct and transmits a signal of ''H'' through a drop-out part. A switch 24 is switched to extract the data supplied to a delay circuit 23 out of the memory 21 as a correct data. |
