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11. 发明专利

JPS5637762A GROUNDDFAULT DETECTING CIRCUIT 失效
公开(公告)号：JPS5637762A
公开(公告)日：1981-04-11
申请号：JP11280579
申请日：1979-09-05
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： KITANO JIYUNJIROU , TAKESHITA TETSUO , OIKAWA YOSHINORI
IPC分类号： H04M3/22 , H02H3/32 , H04M3/30 , H04Q3/72
摘要： PURPOSE:To obtain a ground-fault detecting circuit suited for formation of the semiconductor integrated circuit, by generating the voltage proportional to the battery line current based on the reference voltage set previously and then comparing the voltage with the voltage proportional to the ground current. CONSTITUTION:When the hook switch of the telephone TEL is turned on, the loop current flows from the ground G' and via the ground line B, TEL, battery line A and battery VBB each. And if the line A has a ground-fault with the resistance RG' due to occurrence of the fault, the ground current flows in addition to the loop current. And thus the battery line current IA becomes larger than the ground line current IB. The current/voltage converting circuit consisting of the transistor TrQ0 and resistances R10 plus R11 generates the voltage proportional to the current IA via the base of the TrQ1 and based on the reference power source VREF. And the voltage proportional to the current IB is generated at the base of the TrQ2 via the resistance R10'. The TrQ1 and Q2 from the voltage comparator. And when the current IA becomes larger than the current IB by the source VREF and by an amount equivalent to the current value set previously, the TrQ1 is turned on to give an inversion to the output of the voltage comparator. Thus the ground-fault detection is carried out.

12. 发明专利

JPS53147412A SUBSCRIBER SCANNING SYSTEM 失效
公开(公告)号：JPS53147412A
公开(公告)日：1978-12-22
申请号：JP6123077
申请日：1977-05-27
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TAKESHITA TETSUO , KIKUCHI AKIRA , YASUI NAOHIKO
IPC分类号： H04Q3/72 , H04Q3/00
摘要： PURPOSE:To perform call detection by making unnecessary any line relay resulting in economizing the system, by detecting the current change of the contacts through the momentary interruption of electronic cut-off contracts at call monitor.

13. 发明专利

JPS53116016A SURGE PROTECTION SYSTEM FOR COMMUNICATION PATH 失效
公开(公告)号：JPS53116016A
公开(公告)日：1978-10-11
申请号：JP3015477
申请日：1977-03-18
申请人： NIPPON TELEGRAPH & TELEPHONE , HITACHI LTD
发明人： KIKUCHI AKIRA , YASUI NAOHIKO , MUKAEMACHI TAKUJI , TAKESHITA TETSUO
IPC分类号： H02H9/04 , H01H85/00 , H04Q3/64
摘要： PURPOSE:To protect the communication path to a lighting surge incoming to the transmission line and to prevent the malfunction, by using four types of elements of fuses, resistors, common type chokes, and non-linear elements such as oxide varistors.

14. 发明专利

JPS53115110A LIGHTTCOMBINATION TYPE CURRENT SWITCH SCANNING SYSTEM 失效
公开(公告)号：JPS53115110A
公开(公告)日：1978-10-07
申请号：JP3015377
申请日：1977-03-18
申请人： NIPPON TELEGRAPH & TELEPHONE , HITACHI LTD
发明人： KIKUCHI AKIRA , UENO TAKAO , TAKESHITA TETSUO
IPC分类号： H04Q3/72 , H03K17/78 , H04Q3/00
摘要： PURPOSE:To minimize the circuit size as well as to promote the IC formation, by driving the driving circuit through light combination at the application time of the scanning pulse to switch the driving circuit to the detector circuit side and then detecting the state of the scanned circuit through light combination.

15. 发明专利

JPS5617562A SENDING SYSTEM OF CHARGING PULSE 失效
公开(公告)号：JPS5617562A
公开(公告)日：1981-02-19
申请号：JP9267879
申请日：1979-07-23
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： KOJIMA KIMIFUMI , TAKESHITA TETSUO , SHIMIZU KIICHI , HIMENO RIYOUICHI
IPC分类号： H04M15/00 , H04M15/12 , H04Q3/42
摘要： PURPOSE:To eliminate the division loss among the charging trunk circuit, the general talking trunk circuit and the trunk line each, by providing the polarity inversion pulse circuit at the trunk line side of the network as well as an additional circuit to the terminal unit side each. CONSTITUTION:Polarity inversion pulse circuit 12 having the functions to supply the talking current and transmit the polarity inversion pulse is provided at the trunk line side of network 3. At the same time, additional circuit 14 which gives termination to the talking current given from general talking trunk circuit 13 and makes only the talking signal pass through is provided at the terminal unit side. Then circuit 14 is connected to circuit 13 via the 1st network bus to transmit the talking signal to public telephone 1. On the other hand, circuit 12 is connected to telephone 1 via the 2nd network bus to supply the polarity inversion pulse and the talking current. In such way, the polarity inversion pulse circuit is installed in an intensive way, thus eliminating the division loss of the general talking trunk circuit and the trunk circuit.

16. 发明专利

JPS55154867A CURRENT SUPPLY CIRCUIT FOR TELEPHONE SWITCHBOARD 失效
公开(公告)号：JPS55154867A
公开(公告)日：1980-12-02
申请号：JP6263979
申请日：1979-05-23
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE , OKI ELECTRIC IND CO LTD , NIPPON ELECTRIC CO , FUJITSU LTD
发明人： TAKESHITA TETSUO , OIKAWA YOSHINORI , TSUTSUMI TAKEHIKO , HASEGAWA KOUICHI , FUKUDA HARUKI
IPC分类号： H04M19/00
摘要： PURPOSE:To supply a constant current to a subscriber with a loop resistance more than a fixed value while supplying an operating current from an antiside tone varister in a telephone set to a short-distance subscriber, by providing an output voltage detecting circuit with a Zener diode. CONSTITUTION:A load (e.g, subscriber's line) between load terminals 5 and 5' is supplied with currents from current-supplying current amplifiers 1 and 1'. Fluctuations of a voltage between terminals 5 and 5' are detected by output voltage detecting circuit 3. Circuit 3 is provided with Zener diode ZD1, which starts operating when the voltage between the load terminals exceeds a fixed value. As a result, the negative feedback ratio of the negative feedback loop formed of R3, R7, D2, Q3(Q3'), Q2(Q2'), and Q1 becomes zero, so that a constant current will be supplied to the load.

17. 发明专利

JPS54116812A NETWORK DRIVING SYSTEM 失效
公开(公告)号：JPS54116812A
公开(公告)日：1979-09-11
申请号：JP2345878
申请日：1978-03-03
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MUKAEMACHI TAKUJI , TAKESHITA TETSUO , SHIMIZU KIICHI , HIMENO RIYOUICHI
IPC分类号： H04Q3/52
摘要： PURPOSE:To improve noise proof with the size and the number of driving lines both reduced by selectively driving switches by sending out each assignment information in a time-division mode corresponding stages in a network with semiconductor channel switches of multi-layer structure arrayed in a matrix shape. CONSTITUTION:Switch controller 100 is provided which is connected to a controller, as to the driving control of a network of multi-stage structure using switch matrixes 1 to 10 obtained by arraying, in a matrix shaped, semiconductor channel switches of PNPN four-layer structure controlled by more than three input pieces of information. This controller 100 is equipped with register 101 receiving control information, timing circuit 102 generating various timing pulses needed for the switch control, information expansion decoders 103 to 106, current absorbing circuits 107 to 109 for fan-out buffer assignment, and driving current supply circuits 110 and 111; respective pieces of assignment information inputted to register 101 are sent out in the time-division mode corresponding to stages so as to drive selectively a desirable switch in each stage.

18. 发明专利

JPS544008A COMMUNICATION PATH SYSTEM OF UNIIDIRECTION 失效
公开(公告)号：JPS544008A
公开(公告)日：1979-01-12
申请号：JP6851277
申请日：1977-06-10
申请人： NIPPON TELEGRAPH & TELEPHONE , HITACHI LTD
发明人： KIKUCHI AKIRA , YASUI NAOHIKO , MUKAEMACHI TAKUJI , TAKESHITA TETSUO
IPC分类号： H04M3/02 , H04Q3/52
摘要： PURPOSE:To simplify the control of communication path and also to make small the communication path in size, by using one semiconductor switch for one crossing point.

19. 发明专利

JPS53138206A INTERRUPTION CONTROL SYSTEM OF SWITCHING MATRIX 失效
公开(公告)号：JPS53138206A
公开(公告)日：1978-12-02
申请号：JP5205077
申请日：1977-05-09
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： KOJIMA KIMIFUMI , TAKESHITA TETSUO , KIKUCHI AKIRA , YASUI NAOHIKO
IPC分类号： H04Q3/52 , H04M3/20 , H04Q3/64
摘要： PURPOSE:To realize an economical and flexible network by enabling the interruption from either an incoming or outgoing line by means of a memory circuit for branch-point control information provided at the interruption-limited side of a matrix.

20. 发明专利

JPS53137611A RESPONSE MONITOR CIRCUIT IN TELEPHONE EXCHANGING UNIT 失效
公开(公告)号：JPS53137611A
公开(公告)日：1978-12-01
申请号：JP5204877
申请日：1977-05-09
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： ENAMI SHIROU , TAKESHITA TETSUO , YASUI NAOHIKO , KIKUCHI AKIRA
IPC分类号： H04Q3/42
摘要： PURPOSE:To establish a response monitor circuit in a telephone exchanging unit having less communication loss and small in size and constituted all with semiconductors.

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