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公开(公告)号：JPS60261229A
公开(公告)日：1985-12-24
申请号：JP11653284
申请日：1984-06-08
发明人： WATABE MASATOSHI , OOTSUKI MITSUO
摘要： PURPOSE:To change a change-over terminal depending on whether the circuit is two-wire system or four-wire system, and obtain voice interface of two-wire and four wire by constituting a convertor of single package and mounting two transformers of the same characteristic and a switch-over terminal. CONSTITUTION:Transformers 5, 6 are connected to each of an input terminal 8 and output terminal 9 of a channel converting section, and a change-over terminal block 3 is connected to other end of the transformers 5, 6. In the case where voice side interface is two-wire system, the input terminal 1 is made an input/output terminal 2W, and the output terminal 2 is used as an external balanced circuit network connecting terminal BN. In the case of four-wire system, the terminal 1 is made an input terminal 4WS, and the terminal 2 is used as an output terminal. An internal balanced circuit network 4 and a capacitor 7 are connected to the block 3. Terminals 1, 2 of the block 3 are switched depending on whether the circuit is two-wire system or four-wire system. Thus, interface of two-wire and four-wire is realized by one kind of channel converting board.
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公开(公告)号：JPS6033016B2
公开(公告)日：1985-07-31
申请号：JP2112078
申请日：1978-02-25
发明人： MURASAWA KENICHI , AOKI MAKOTO
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公开(公告)号：JPS60119138A
公开(公告)日：1985-06-26
申请号：JP22748983
申请日：1983-12-01
申请人： NIPPON ELECTRIC CO
发明人： UNZAI MINORU , HASEGAWA KOUICHI
摘要： PURPOSE:To remove crosstalk from other circuits by mounting balanced circuit networks and balanced circuit network switches for turning on/off a hybrid part and the balanced circuit networks on the basis of a logical input signal close to the hybrid part in a subscriber's circuit and switching the balanced circuit networks from the external on the basis of the logical input signal. CONSTITUTION:The balanced circuit network switches 81-84 are arranged between respective balanced circuit networks 61-64 and a connection point X of the balanced circuit networks 61-64 and turned on/off on the basis of a logical input signal. Control terminals a-d of respective balanced circuit network switches 81-84 are alloted to an alteration switch 70 and switched and connected on the basis of the operation of the alteration switch 70. Namely, all the balanced circuit networks 61-64 and all the balanced circuit network switches 81-84 are arranged close to the hybrid coil 10 as shown in the figure. When the balanced circuit network 61 is to be used, the alteration switch 70 is turned to the lower-most position of the figure, so that the balanced circuit network switch 81 is turned on and the balanced circuit network 61 is connected.
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公开(公告)号：JPS6032496A
公开(公告)日：1985-02-19
申请号：JP14060983
申请日：1983-08-02
申请人： FUJITSU LTD
发明人： KATOU SEIJI , KANEKO KAZUHIRO , KUROSAKI HIROKO
摘要： PURPOSE:To miniaturize the circuit by making electrostatic capacity of a capacitor that constitutes a balancing circuit small. CONSTITUTION:The input terminal of an operational amplifier OP5 is connected to the receiving circuit 4WR of a four-wire circuit and output terminal of an operational amplifier OP6 is connected to a transmitting circuit 4WS and an operational amplifier OP7 having the same circuit configuration with negative feedback and positive feedback circuits of operational amplifiers OP1, OP2 that feed terminal equipment connected to a two-wire circuit 2W is connected to output terminal of the amplifier OP5. A balancing circuit Z of equivalent circuit configuration with terminal equipment side is connected to output terminal of the amplifier OP7. An operational amplifier circuit OP8 adds output of the circuit Z to input terminal of the amplifier OP6 and eliminates sneak signal component passed through the terminal equipment side. Values of resistances R21-R25 of the amplifier OP7 are made n times that of resistances R1-R5, R11-R15 of amplifiers OP1, OP2, and electrostatic capacity of the circuit Z is made 1/n.
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公开(公告)号：JPS59201532A
公开(公告)日：1984-11-15
申请号：JP7725383
申请日：1983-04-28
申请人： Aihon Kk
发明人： MORIYAMA KENJI
CPC分类号： H04B1/582
摘要： PURPOSE:To select automatically the most suitable balancing circuit network by comparing a side tone level and a transmission level immediately after lines are connected by one hybrid circuit and one set of plural balancing circuit networks. CONSTITUTION:A transmission signal eT is transmitted from a transmission signal source vT and a part of this signal is inputted to a division circuit 14 via a high-pass filter 16 and a smoothing circuit 17. Further, a side tone signal eT generated in a receiver R via a hybrid circuit H3 is inputted to the division circuit 14 via a high-pass filter 12 and a smoothing circuit 13, where a side tone attenuation decided by the transmission signal eT and the side tone signal es is obtained. Balancing circuit networks BN1-BNi maximizing the side tone attenuation are selected and connected to the hybrid circuit H3.
摘要翻译： 目的：通过一个混合电路和一组多个平衡电路网络连接线路之后，通过比较侧音电平和发送电平，自动选择最合适的平衡电路网络。 构成：从发送信号源vT发送发送信号eT，并且该信号的一部分经由高通滤波器16和平滑电路17输入到除法电路14.此外，在a 通过混合电路H3的接收器R经由高通滤波器12和平滑电路13输入到分频电路14，在该平滑电路13中获得由发送信号eT和侧音信号es决定的侧音衰减。 选择最大化侧音衰减的平衡电路网络BN1-BNi并将其连接到混合电路H3。
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公开(公告)号：JPS5941358B2
公开(公告)日：1984-10-06
申请号：JP8571179
申请日：1979-07-06
申请人： Fujitsu Ltd
发明人： SATO TADAFUMI , FUJI KATSUAKI
CPC分类号： H04B1/58
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公开(公告)号：JPS5916431A
公开(公告)日：1984-01-27
申请号：JP12648582
申请日：1982-07-19
发明人： NOMURA YOSHIO
CPC分类号： H04B1/586
摘要： PURPOSE:To minimize the return loss, by providing the 1st balancing circuit network making an input impedance of a circuit viewed from a two-wire line constant and the 2nd balancing circuit network maximizing a howling margin in a four-wire line loop. CONSTITUTION:An inverting input terminal (-) of a balancing input amplifier A1 and an output terminal of an amplifier A2 are connected via the 1st balancing circuit network ZN determining the input impedance viewed from the two- wire line I . Further, a non-inverting input terminal (+) of the balancing input amplifier A1 and an output of the amplifier A2 are connected via the 2nd balancing circuit network Z12 determining the howling margin in a four-wire line IIloop. Further, the 1st balancing circuit network ZN is set optionally so as to provide a specific impedance. Further, Z1, Z2 of the 2nd balancing are set so as to maximize the howling margin taking line impedances ZL, ZN connected to the two-wire line into account.
摘要翻译： 目的：为了最小化回波损耗，通过提供第一个平衡电路网络，从两线制线路常数看到电路的输入阻抗，第二个平衡电路网络使四线制线路中的啸叫余量达到最大。 构成：平衡输入放大器A1的反相输入端（ - ）和放大器A2的输出端通过第一平衡电路网络ZN连接，从而确定从双线I看的输入阻抗。 此外，平衡输入放大器A1的非反相输入端（+）和放大器A2的输出经由第二平衡电路网络Z12连接，确定四线线路IIloop中的啸叫余量。 此外，第一平衡电路网络ZN可选地设置成提供特定阻抗。 此外，第二平衡的Z1，Z2被设定为使得连接到双线线路的线路阻抗ZL，ZN最大化。
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公开(公告)号：JPS5843925B2
公开(公告)日：1983-09-30
申请号：JP7943974
申请日：1974-07-10
申请人： NIPPON ELECTRIC CO
发明人： HASEGAWA SUSUMU , MYAZAKI YOSHIHIKO
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公开(公告)号：JPS58121837A
公开(公告)日：1983-07-20
申请号：JP427882
申请日：1982-01-14
申请人： NIPPON ELECTRIC CO
发明人： KUSHIDA YOSHINOBU
摘要： PURPOSE:To avoid the amount of crosstalk between four-terminal input and output terminals, by setting a differential amplifier output so that signals from a 4-terminal input to 4-terminal output terminals are in opposite polarity to the output. CONSTITUTION:The circuit consists of a 2-wire output terminal 2, a summing amplifier 3 from the terminal 2 to a 4-wire output terminal 4, an amplifier 6 transmitting 4-wire input signals with a low output impedance, a 4-wire input terminal 5, a 2-wire impedance matching resistor 7, and a differential amplifier detecting a voltage across the resistor 7, and the output of the differential amplifier 8 is inputted to the amplifier 3. The input impedance of the amplifiers 3, 6 is sufficiently high and the output impedance is sufficiently low. Since inputs from the two-wire are summed and the voltage is doubled, the ratio of a desired signal at the terminal 4 (two-wire input/output) to unnecessary signal (detour output of 4-wire input 5) is increased from a conventional hybrid circuit by 6dB.
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