| 摘要 |
PURPOSE:To reduce the number of cable conductors of a connection cable between transmission and reception parts, and also to reduce the cost of a unit on the whole by transmitting two mutual synchronizing pulse signals simultaneously via the single transmission line. CONSTITUTION:Once horizontal and vertical driving pulses (a) and (b) are inputted to transmission part 1, monostable multivibrator circuit 5 is triggered at the leading edge of pulse (b) to output pulse (c) of width (t), and monostable multivibrator circuit 6 is triggered at the trailing edge of pulse (c) to output pulse (d) delayed by period H-t, denoting the period of pulse (a) as H. When pulse (d) is polarity-inverted by inverter circuit 7, a pulse generation part outputs different- polarity pulse (e) lagging pulse (a) by time (t). Therefore, supplying positive pulse (e) and negative pulse (a) to mixer circuit 3 obtains mixed pulse (f) of bipolarity holding the maximum potential of one pulse and the minimum potential of the other at OV, and it is transmitted from transmitter circuit 4 to reception part 8 via transmission line 14. According to the polarity of pulse (f), separator circuit 9 separates through the ON-OFF operation of a transistor to output positive and negative pulses. Those are restored by waveform shaping through delay circuit 10 and monostable multivibrator 12. |
