| 摘要 |
<p>PURPOSE:To identify the pulse width without losing the pulse width of an input pulse signal by comparing a prescribed pulse width and an input pulse signal width so as to identify an input pulse signal and ANDing the identified input pulse signal and a pulse signal having a pulse width twice that of the input pulse signal an in synchronizing therewith. CONSTITUTION:A miller integrator 3 forms a voltage corresponding to the pulse width of the inputted pulse signal A and a triangular wave signal B having a slope comprising a C, R time constant and a base having a width twice the input pulse width. A zero cross detector 4 generates a pulse signal D having a pulse width twice that of the input pulse signal from the triangular wave signal B and gives an output to an AND circuit 5. On the other hand, a comparator circuit 71 compares triangular waveform signals B1, B2 corresponding to the input pulse signals W, N outputted from the miller integrator 3 with a reference voltage G corresponding to a prescribed pulse signal width X, generates a control pulse signal E and gives an output to the AND circuit 5. The AND circuit 5 outputs a pulse signal the same as the input pulse signal with a delay of the input pulse width in case of W>X. Furthermore, in case of N<X in the pulse width, no signal is outputted.</p> |
