| 摘要 |
PURPOSE:To improve the use efficiency of the output of a signal, by transmitting a call signal, which is obtained by inverting the signal transmission time and the signal interruption time of an original call signal, as the second call signal. CONSTITUTION:While contacts a1-a3 are closed, relays Q4-Q6 are operated oppositely to relay Q1-Q3 when contact (b) in restored and relays Q4-Q6 are restored when contact (b) is operated. As the result, call signals S4-S6 transmitted through contacts q4-q6 have an inverted relation between a signal transmission time T/4 and a signal interruption time T/4 to call signals S1-S3 in the signal transmission period of the call signal. Consequently, call signals S1-S3 and call signals S4-S6 are impressed to ringing trunks RGT1 and RGT2 divided into two to use effectively the output of a signal OSC. |
