| 摘要 |
PURPOSE:To perform the change in intermitting time and frequency with one device, by transmitting a composite call signal having the pattern overlapping in time a plurality of different call signals and a synchronizing signal synchronized with the composite call signal with a certain time relation. CONSTITUTION:In an electronic exchanger 6, a composite call signal and a synchronizing signal are received from a telephone signal power supply 1 via transmission lines 2 and 5. The electronic exchanger 6 forms grouped call signal to form it as the call signal from a subscriber of each group. On the other hand, the device 1 consists of a microprocessor 16, clock oscillator 14, memory circuit 15, and composite call signal generating circuit 13, and it stored the program in the microcomputer 12 to change the memory content of the memory circuit 15, allowing to change intermitting time or frequency by one set. |
