| 摘要 |
PURPOSE:To attain the effective utilization of a radio wave by inserting an information data to a signal and sending the result from a data transmitter in the form of general calling at the blank time when no usual call signal exists. CONSTITUTION:In the absence of a call signal 8' from a subscriber telephone set 1, an information data 9 is sent from a data transmitter 7 to a radio call coder 3, from which data is sent as a radio wave from a radio call transmitter 4 and an antenna 5. The data is sent from the data transmitter 77 so as to fill the gap of usual call signals 8 on the time base and the data signal 9 is inserted thereto. The radio wave sent from the radio call transmitter 4 is received by a radio call receiver 6 and demodulated and when a special identification number representing a general calling form is received, the data signal 9 is decoded and displayed on a display device through the provision of the function. |
