| 摘要 |
PURPOSE:To economize the unit through making unnecessary the transformers and impedance matching resistors accompanied with them and to reduce the attenuation of communication, by the capacitor coupling system. CONSTITUTION:When the subscriber telephone sets SUB0-SUB3 are connected to the connection terminals LA0-LB3 of the telephone set via the communication path network and conference telephone is used, the relay A0 of LA0 and LB0 is actuated, current flows to SUB0, and the contacts a0<0>-a0<5> are closed. Similarly, other contacts a1<0>-a3<5> are closed. Further, SUB0 is connected to SUB1 via LA0, LB0, a0<0>, a0<1>, ca pacitors C0, C1, a1<0> ,a1<1> ,LA1, LB1 and also connected to SUB2 and SUB3. Other telephone sets are respectively connected to other telephone sets. Accordingly, audio from one telephone set is distributed to other telephone sets to perform conference telephone. |
