| 摘要 |
PURPOSE:To enable to set the data punching level to an optimum value automatically, by detecting the detection code from the data signal having it and adding it to the level comparator after integration. CONSTITUTION:Data and a data signal consisting of the inspection code using circulation code of virtual noise series are fed to the signal input terminal 2. When timing pulses are fed to the terminals 5, 6, the timing pulse in synchronizing with the check code is produced from the timing signal generator 7. When this pulse is fed to the switch circuit 8, the circuit 8 turns on every incoming, it extracts the check code in the output of the level comparator 1 and feeds to the integration circuit 9. The output of the circuit 9 is a DC voltage, which is fed to the reference input terminal 3 of the comparator 1 to determine the data punching level. The output of the circuit 9 is almost a half the peak value of the data pulse and converges to the optimum value of the data punching level automatically. |
