| 摘要 |
PURPOSE:To attain an anti-side tone efficiently with a simple constitution by connecting an impedance circuit between a T-type bridge circuit and a balancing network in parallel with the balancing network and also inserting a voltage converting circuit setting up voltage to be applied to a receiver circuit within a prescribed value into the titled circuit. CONSTITUTION:The impedance circuit 10 is connected between the T-type bridge circuit and the balancing network 5 in parallel with the network 5. On the other hand, voltage obtained by dividing line voltage eL by a resistance voltage dividing circuit 11 is applied to one end of the receiver circuit 6. If the voltage dividing ratio of the circuit 11 is set up to 1/N, voltage to be applied to the other end of the circuit 6, i.e. voltage equal to the voltage e'N applied to the network 5, can be applied to one end of the circuit 6. Consequently, the difference of voltages applied to both ends of the circuit 6 is zero. Thus, the dynamic range of an amplifier circuit constituting the network 5 can be set up to a sufficiently large value, the amplifier circuit can be driven without distortion and side tone balancing state can be stably maintained. |
