| 摘要 |
PURPOSE:To reduce the error of the identification and reproduction for the clamping circuit which is used to the repeater for compensation of the DC component fluctuation by securing the automatic switching through which the DC clamp level is lowered less than the identification level at the nonsignal time and then fixed to the proper level at the normal signal input time. CONSTITUTION:The double pulse reproduction repeater is constituted with automatic gain fluctuation circuit 15, amplifier 16 and amplitude detector 17 which form the equivalent amplification system to compensate the level fluctuation of the input binary pulse signal, plus transistor TR2 forming the clamping circuit to compensate the DC component fluctuation of the input binary pulse signal and switching TR1 to switch the DC bias. When the DC control voltage of detector 17 exceeds the threshold level preset to voltage comparator 20, TR1 of clamping circuit is turned on and off to control the voltage at point 22 of the base side of TR22. And the DC control voltage of circuit 15 is switched automatically to be applied to identification reproducing circuit 25. |
