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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：JPS60259033A
公开(公告)日：1985-12-21
申请号：JP6925585
申请日：1985-04-03
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公开(公告)号：JPS60185453A
公开(公告)日：1985-09-20
申请号：JP4078484
申请日：1984-03-02
摘要： PURPOSE:To detect the optimum impedance in response to the change in the line condition by retrying side tone measurement from the state of a variable impedance balanced circuit network having a prescribed impedance in response to the change of line impedance. CONSTITUTION:When the circuit state is changed and the change in A/C is between the 1st and 2nd reference values D1 and D2, the 2nd measuring means 52 transmits an output signal representing it to an impedance control means 53. The impedance control means 53 controls a variable impedance balancing circuit network for a predetermined sampling processing. When the change is larger than the D2, the 2nd measurement means 52 transmits the output signal representing it to the impedance control means 53. The impedance controller 53 restores the value of the variable impedance balanced circuit network to an initial value newly and applies the control of sequential change.
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公开(公告)号：JPS60174537A
公开(公告)日：1985-09-07
申请号：JP3123984
申请日：1984-02-20
发明人： AOYANAGI MASARU , OGURA HARUO
摘要： PURPOSE:To secure excellent communication quality when a two-wire type circuit is branched and a three-party communication is made by connecting a resistance attenuator and two two-wire type two-way repeaters to a resistor and equalizing transmission loss between terminals. CONSTITUTION:A network 2 for three-way branching has three couples of terminals, and transmission loss in each direction is set equal. One terminal of the attenuator 3 is connected to the 1st couple of terminals, and the other is connected to signal input/output terminals (a) and (a). Further, the two-wire type two-way repeaters 1 and 1' are interposed between the 2nd and the 3rd terminal couples of the network and signal input/output terminals (b) and (b), and (c) and (c). The attenuation of the attenuator 3 and the gains of the repeaters 1 and 1' are so set that transmission loss is equalized between the terminals (a) and (a), and the 1st and the 2nd transmission terminals with specific transmission loss when the 1st and the transmission lines are connected to the terminals (b) and (b), and (c) and (c).
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公开(公告)号：JPS6037662B2
公开(公告)日：1985-08-27
申请号：JP10808476
申请日：1976-09-09
申请人： NIPPON ELECTRIC CO
发明人： TAKANO SEIJI
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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：JPS60117989A
公开(公告)日：1985-06-25
申请号：JP22582683
申请日：1983-11-30
申请人： NIPPON ELECTRIC CO
发明人： ARAI MASANOBU , SHINOZUKA TAKASHI , HAYASHI TAKAO
摘要： PURPOSE:To decrease the number of elements of high accuracy and also to attain an optional impedance by using the 1st feedback loop for the same voltage component as an input and the 2nd feedback loop having the transmission relation needed to realize the desired impedance synthesization to a prescribed frequency area. CONSTITUTION:The 1st feedback means consists of the loops reaching drive amplifiers 2 and 3 from the output of a differential amplifier 1. While the 2nd feedback means consists of an AC feedback circuit 4 containing a hybrid circuit 42 for two-wire/four-wire exchange with the high band pass characteristics and a DC feedback circuit 5 having the low band pass characteristics. The circuit 4 converts the output voltages of a balance/unbalance conversion circuit 41 and the circuit 42 into currents and supplies them to amplifiers 2 and 3 respectively. The circuit 5 uses the output of the amplifier 1 as an input to realize a variable inductance containing the variable time constant characteristics that increases and decreases the time constant when the input signal has small and large amplitudes respectively.
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公开(公告)号：JPS60116206A
公开(公告)日：1985-06-22
申请号：JP22363483
申请日：1983-11-28
摘要： PURPOSE:To extend the frequency region possible for the design by pushing a 1/4 wavelength transformer for impedance matching between input/output lines and four connecting parts to which each two high/low impedance lines of 1/4 wavelength are connected alternately. CONSTITUTION:The high impedance lines 10, 11 and the low impedance lines 12, 13 of 1/4 wavelength are arranged and connected alternately. Impedance transformers 18-21 of 1/4 wavelength for impedance matching are inserted between four connecting parts of a branch part formed through this arrangement and four input/output lines. The impedance of the lines 10, 11 is increased more than the impedance of the lines 14-17. Thus, the line width is designed narrow and the upper limit of the frequency is extended. Moreover, the stray coupling of the lines 10, 11 or 12, 13 is decreased by widening the line distance of the branch part, thereby improving the electric characteristic.
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公开(公告)号：JPS60112345A
公开(公告)日：1985-06-18
申请号：JP21973583
申请日：1983-11-22
摘要： PURPOSE:To obtain the satisfactory anti-side tone characteristics in a short time by changing the impedance of a variable impedance balanced circuit network into prescribed plural impedances and obtaining a ratio between the output signal of a bridge circuit and the output signal delivered from a speech output circuit. CONSTITUTION:If the maximum side tone attenuation quantity is obtained when the impedance value is set at Z51, a control part 13 changes a variable impedance balanced circuit network 6 into prescribed values Z52, Z53...Z59 which are prescribed to the impedance value Z51, and calculates the B/C of each time. For instance, the maximum side tone attenuation quantity is shown with the value Z55. Thus this value Z55 is defined as the optimum impedance value. Then the side tone attenuation quantity B/C of this case is compared with the side tone attenuation quantity A/C of a fixed impedance balanced circuit network 7. Then switches SW1 and SW2 are switched within a switch part 16 in order to increase the attenuation quantity. This secures a call through an anti-side tone circuit having the optimum anti-side tone characteristics.
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