| 摘要 |
PURPOSE:To output a signal in which unnecessary pulses are securely cut by controlling clocks for all the actions of two monostable multivibrator circuits. CONSTITUTION:It is assumed that the unnecessary pulses (broken line parts) shorter than a pulse time(t) are inputted in an input digital pulse signal (a) in an H state and an L state by respectively one time. Since the monostable multivibrator circuit 1 operates by the rise of the signal (a), the up edge in the initial H state of the signal (a) and the up edge of the unnecessary pulse at the time of the L state are triggered and the pulse (b) of a pulse width (t) is outputted. On the other hand, a monostable multivibrator circuit 2 which operates by the fall similarly outputs a pulse (c) in the down edge of the signal (a). Since the circuits 1 and 2 input the opposite output pulses to self clear terminals, they do not operate with respect to the unnecessary pulses when the signal (a) is in the H and L states. When the exclusive OR of the signals (b) and (c) are taken, a signal (d) is made. Consequently, an FF circuit 4 latches the signal (a) with the signal (d) as the input clock, and an output digital pulse signal (e) in which the unnecessary pulses are cut is outputted. |
