| 摘要 |
PURPOSE:To attain telephone conference simultaneously with participants located at plural locations by using a 2-wire/4-wire converter so as to separate a 2-wire telephone line into the transmission and reception lines and connecting respectively the separated lines to a distribution amplifier and a mixing amplifier. CONSTITUTION:After a signal inputted from optional 2-wire telephone lines W1-Wn to a conference telephone set connector C is inputted via 2-wire/4-wire converters H1-Hn and reception lines R1-Rn to distribution amplifiers RA1- RAn and amplified, the result is transmitted from (n-1)-terminal to mixing amplifiers SA1-SAn. In this case, no signal is transmitted to the own communication line. An output of the amplifiers SA1-SAn is outputted to transmission lines S1-Sn and the signal of the lines S1-Sn is transmitted to all remaining lines except the lines W1-Wn inputted via the converters H1-Hn. |
