| 摘要 |
PURPOSE:To refer to contents on a display device to confirm related slave machine numbers by displaying a calling slave machine number and slave machine numbers of slave machines participating in the conference speech on display devices attached to slave machines. CONSTITUTION:A slave machine 12 confirms answer back from a repeating installation 11 to generate a call or state code and a discrimination code and sends them to the repeating installation 11, and the repeating installation 11 sends the call or state signal to a controller 10. The controller 10 latches the state of each slave station and generates an addtional code to send it to the repeating installation, and the repeating installation 11 confirms the additional code and sends it to all slave machines 12 together with the discrimination code, and the slave machine 12 displays contents conforming to the additional code. States of participation/ nonparticipation of busy slave machines are sent to the repeating installation 11, and the dynamic state during speaking is successively displayed on the display device by generation of the additional code of the controller and its display.
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