| 摘要 |
PURPOSE:To enable effective communication with less number of conference lines in comparison with the number of slave stations, by the operation of specified switches of each slave station according to a monitor signal from a master station. CONSTITUTION:The connection between a master station M' and slave stations S1'-Sn' is made at incoming channels CH1-3 in response to the selection of contacts of a digital switch DS13 of each station and at outgoing CH1-3 in response to the selection of contact of an audio switch VS23. According to the status of monitor signals OWSV1-3 from the master station, a slave station making communication next switches a DS13 and a VS23. A conference signal OW1' from the slave station S1' reaches the master station M' with the incoming CH1 and is given to the outgoing CH2,3 to be a part of the conference signals OW2,3. Similarly, the OW2' from the S2' is a part of the OW 3,2 and the OW3' from the S3' is a part of the OW1,2. Thus, the OW2',3' from the S2',S3' from the outgoing CH1 at the S1' are received as the OW1, and the master station M' listens to the OW1'-3' via a synthesizer 29 and transmits the voice to the entire outgoing lines from a distributor 30. |
