| 摘要 |
PURPOSE:To make the signal transmission effective, by providing a switch by- passing an attenuator added to a satellite communication line transmission side at off-hook of a receiver and a switch by-passing a narrow band filter added to the reception side of the satellite communication line in response to the level of the input signal. CONSTITUTION:A signal path of the transmission side of the satellite communication line is provided with an attenuator 1, and at on-hook, a switch 2 is opened and a line signal is transmitted at a level lower by 4dB than the specified level. At off-hook, the switch 2 is closed and the sound is transmitted at the specified level. At the reception side, a band pass filter 4 having a lower level by 4dB than the specified level in addition to a normal broad band filter 3 is provided, the filter 4 is used at no communication state and the filter 3 is used at communication state through switching by means of an input/output switching device 5. |
