| 摘要 |
<p>PURPOSE:To prevent the deterioration of the balancing condition of the hybrid circuit by inserting the first spurious line circuit to be approximate to the impedance of a two-wire system telephone line between the connecting terminal, in which the two-wire system telephone set is connected, and the hybrid circuit, and inserting the second spurious line circuit between the hybrid circuit and the balance circuit. CONSTITUTION:Between telephone set connecting terminals T1 and T2, and a hybrid circuit 11, the first spurious circuit 16 is inserted. When the telephone set connecting terminals T1 and T2 sides are viewed from the hybrid circuit 21 of a telephone set 2, the hybrid circuit 11, the second spurious line circuit 17 and a balance circuit 12 are viewed through the spurious line circuit 16 and in among of them, the impedance of the spurious line circuit 16 dominantly functions. Namely, what is approximate to the impedance of a telephone line 3 can be viewed from the telephone set 2 and the telephone set 2 goes to be almost equivalent to the time when the set is directly connected to the two-wire system telephone line. Consequently, the balance condition of the hybrid circuit 21 in the telephone set 2 goes to be satisfactory and for this reason, the turning to the receiver 23 of the transmitting signal is very little.</p> |
