| 摘要 |
PURPOSE:To improve the transmission and operability by incorporating converters for information form being voice signals, DC signals and digital signals in one package and operating the switching of the converters internally and externally. CONSTITUTION:Outputs and inputs of AC amplifiers 11a, 11b, VF and FV converters 12a, 12b and VF, FV converters 13a, 13b are selected by selectors 14a, 14b. The switching is executed by a method by synchronization by two selectors. Since a receiver 16 is provided with automatic gain control and auto matic frequency control and the DC level is not transmitted as it is but transmit ted after being converted into AC signals at the sender. Further, a selector switch (SW) 22 is provided additionally and similar modulators and receivers are added. In using these sets, the switching of the selectors 14a, 14b is attained; a switch 1 or 2 is selected at one side, a switch 1 or 2 is selected at the other side. |
