| 摘要 |
PURPOSE:To reproduce data pulse being correspond to original data pulses by providing a voltage comparator which is supplied with the output signal of a voltage dividing means at one reference input with the output signal of a clamping means at the other comparison input. CONSTITUTION:A video signal amplified to a prescribed level is fixed by a clamping curcuit II at about 0V, and a signal S1 is outputted. The signal S1 is supplied to the normal-phase input part (+) of a voltage comparator III and also supplied to a lower-limit voltage limiting circuit VI as well. The circuit VI cuts noises of the signal S1 which are almost at 0V, a peak detecting circuit IVperforms peak detection, and the voltage is divided to half through resistances R5 and R6 to obtain a signal S4. The signal S4 is supplied to the inverted input part (-) of the comparator 3 and compared with the signal S1. When the signal S1 is larger than the signal S4, ''1'' is outputted, and when not, ''0'' is outputted. In this case, even if a noise component is superposed upon the signal S1, the lowest voltage level of the signal S4 is made higher than the noise component, so sliding operation is not affected by the noise. |
