| 摘要 |
PURPOSE:To drive a calling sound generating device, to generate the normal calling sound and to select the transmitter at the incoming side only in case of the coincidence by accumulating a subscriber telephone number by the memory connected to a CPU and comparing the sent transmitter telephone number and the subscriber telephone number by the CPU. CONSTITUTION:The signal inputted from a receiving line 15 is amplified and shaped by a transmitting receiving amplifier 1, and at a multiple separating circuit 2, the control signal and the sound signal are separated. The receiving control signal separated by the multiple separating circuit 2 is converted to the suitable format by a control signal receiving circuit 3 and inputted to a CPU. At the INS digital communicating network, the transmitter telephone number is sent s a kind of the control signal at the time of the incoming. For such a reason, the CPU 4 can detect the transmitter telephone number of the opponent at the time of the incoming. The CPU 4, when one of the subscriber telephone numbers stored in a memory 8 is coincident with the transmitter telephone number, the transmitter telephone number is displayed at a displaying device 5. Simultaneously, by a calling sound control circuit 6, a calling sound generating device 7 is driven and the normal calling sound is generated.
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