| 摘要 |
PURPOSE:To improve the stability, by triggerring a monostable multivibrator by a prescribed rise of a composite synchronizing signal and obtaining a horizontal synchronizing signal by the output of the monostable multivibrator and inhibiting the trigger input during the charge or discharge time of the monostable multivibrator. CONSTITUTION:A composite synchronizing signal A is differetiated to obtain negative differential pulses in the output of a diode 3, and they are inverted by an inverter 4 and are inputted to an NAND gate 5. The negative-poarlity trigger signal passing through the NAND gate 5 triggers a monostable multivibrator 1, and a horizontal synchronizing signal H.D is outputted to the output. The horizontal synchronizing signal H.D is inverted by an inverter and is delayed by a delay circuit 7 to input to the NAND circuit 5. Thus, malfunctions are prevented even if unnecessary pulses is delivered during the time when the horizontal synchronizing signals are effected, namely, during the charge or discharge time of the monostable multivibrator. |
