| 摘要 |
PURPOSE:To amplify received voice by inserting a relay coil to a talking circuit and extracting a flux generated therefrom by means of a pickup coil. CONSTITUTION:A talking signal from an opposite party flows to a loop comprising a telephone line connecting terminal 1, a talking circuit 2, a relay coil 8 and a ceramic or condenser type receiver 4, the receiver 4 is actuated to convert a received signal into a voice. In this case, since the received signal passes through the relay coil 8, the coil 8 induces a flux by the received signal, a pickup 5 induces the received signal by electromagnetic coupling and the induced signal is fed to a speaker 7 via an amplifier 6. |
