| 摘要 |
PURPOSE:To use a loop transmission line effectively, by realizing the conference communication, where plural communication channels are required, by a single channel in the conference communication system using the loop transmission. CONSTITUTION:Transmission data set to a transmission bufrer 6 from a conference communication request terminal T is not only sent to an adding circuit 61 but also stored in a transmitted data buffer 51 through a gate G1 and is circulated once on the loop transmission line, and communication data where transmission data from another terminal and transmission data transmitted from the request terminal T itself are superposed is received by a receiving buffer 5, and a gate G2 is opened to input data in the transmitted data buffer and data in the receiving buffer into a subtracting circuit 52, and only transmission data from another terminal is received by the terminal T. Receiving data from another terminal is inputted to an adding circuit 61 through a gate G4 and is superposed to communication data from the terminal T, and they are transmitted as transmission data DS. |
