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736 条记录 (耗时 0.015 秒)

    DISPLAY SYSTEM FOR UNBALANCED QUANTITY OF BALANCING NETWORK
    72.
    发明专利
    DISPLAY SYSTEM FOR UNBALANCED QUANTITY OF BALANCING NETWORK 失效

    公开(公告)号：JPS62284528A

    公开(公告)日：1987-12-10

    申请号：JP12844486

    申请日：1986-06-02

    申请人： NEC CORP

    发明人： SATO MASAYOSHI

    IPC分类号： H04B3/03 ,  H04B3/46 ,  H04B3/493

    摘要： PURPOSE:To select the base balancing network for a subscriber circuit extremely with ease by inputting a test signal from a test signal generating circuit to the four-wire side incoming line of a two-wire four-wire converting circuit and monitoring the quantity of detouring to the four-wire side outgoing side which is displayed on a signal level dispaly circuit. CONSTITUTION:A CTL 4 controls an NW 2 to connect a TSG 3 and an LC 1 and sent out a test signal, which is inputted to an HYB 13 and inputted to DPY 18 according to the quantity of unbalance between impedance connected to the two-wire side of the HYB 13 and BN 131, so that a DV 182 drives an LED 181 to illuminate, If one of selected E1-E3 is not matched sufficiently as the load of the LC 1 at this time, a displayed signal level increases and the LED 181 illuminates brightly. For the purpose, one of the E1-E3 is selected again with an SW and the detouring signal level of the HYB 13 is confirmed by the same procedure; and this selecting operation is repeated to select a balancing network element when the LED 181 illuminates most darkly, so that this element is the best BN 131 for the LC 1.

    HYBRID DELAY ADJUSTING SYSTEM
    73.
    发明专利
    HYBRID DELAY ADJUSTING SYSTEM 失效

    公开(公告)号：JPS62139421A

    公开(公告)日：1987-06-23

    申请号：JP27928885

    申请日：1985-12-13

    申请人： OKI ELECTRIC IND CO LTD ,  NIPPON TELEGRAPH & TELEPHONE

    发明人： IMAI TADAO ,  KATO ISAO ,  UEHARA HIROYASU ,  UCHIMURA KUNIHARU ,  HAYASHI TOSHIO ,  KIMURA TADAKATSU

    IPC分类号： H04B3/03 ,  H04Q3/42

    摘要： PURPOSE:To obtain a value almost equivalent to an output value of a signal to be cancelled at a current point with a simple hardware by setting up the output value of a hybrid circuit to an interpolation value between the output value at the current time and the preceding output value. CONSTITUTION:A driving current is supplied from a control current source 7 to a two-wire circuit terminal 5 and voltage generated between both the ends of the terminal 5 is detected by a differential amplifier 6. The output signal of the amplifier 6 is inputted to an adder 13 through an A/D converter 8 and inputted also to an adder 14 through a circuit terminal circuit 10. On the other hand, a signal inputted from a four-wire side input terminal 4 is inputted to a delay adjusting circuit 12 through the hybrid circuit 11 and the output value of the circuit 11 is set up to an interpolation value between the output value at a current point and the preceding output value. A signal returned to an output terminal 3 through the terminal 5 is cancelled on the basis of the interpolation value.

    RINGING PREVENTING DEVICE FOR VOICE LINE
    75.
    发明专利
    RINGING PREVENTING DEVICE FOR VOICE LINE 失效

    公开(公告)号：JPS61288629A

    公开(公告)日：1986-12-18

    申请号：JP13143385

    申请日：1985-06-17

    申请人： NEC CORP

    发明人： KOYAMA TOSHIO ,  MATSUDA MITSUHIKO

    IPC分类号： H04B3/03 ,  H04B3/20

    摘要： PURPOSE:To attain transmission and reception at the same time by eliminating a reception signal mixed in a 4-wire transmission signal with subtraction so as to improve the ringing elimination capability of the line. CONSTITUTION:A ringing prevention device consists of a resistance matrix circuit 1, a subtraction circuit 2, an equalizing circuit 3 and a buffer circuit 4. A transmission signal V inputted from a 2-wire transmission/reception terminal 2W is mixed with a signal being a reception signal R inputted from a 4-wire reception terminal through the resistance matrix circuit 1 while being branched by the buffer circuit 4. The subtraction circuit 2 subtracts the other branched reception signal through the equalizing circuit 3 from the mixed transmission/ reception signal to eliminate the reception signal from the transmission/reception signal. As a result, only the transmission signal at the transmission/reception terminal 2W is obtained as an output at the 4-wire transmission terminal 4W-S.

    76.
    实用新型
    失效

    公开(公告)号：JPS61197742U

    公开(公告)日：1986-12-10

    申请号：JP8096385

    申请日：1985-05-31

    IPC分类号： H04B3/03

    SUBSCRIBER'S CIRCUIT
    77.
    发明专利
    SUBSCRIBER'S CIRCUIT 失效

    公开(公告)号：JPS61220588A

    公开(公告)日：1986-09-30

    申请号：JP6054685

    申请日：1985-03-27

    申请人： TOSHIBA CORP

    发明人： KITAMURA MASAKI

    IPC分类号： H04B3/03 ,  H04M19/00 ,  H04Q3/42

    摘要： PURPOSE:To constitute terminal impedance with a capacitor having small capacitance by applying the prescribed fold of the terminal impedance to the feedback impedance of an amplifier. CONSTITUTION:When a telephone set that has impedance ZL is connected, a voltage signal that is taken out by operational amplifiers 7 and 9 is outputted from an operational amplifier 11 as a receiving signal and also, is supplied to an amplifier 13 that has an amplification degree A2. An amplifier 14 adds a transmitting signal from a channel system and a signal from the amplifier 13 and it is supplied to a comparator 15 that has an amplification degree A1. The output of the comparator 15 drives transistors 17 and 25 and feedback- controls DC current that is supplied to the telephone set 1 to most appropriate value that is decided by amplification degrees A1 and A2 and also, miniaturization is realized because the terminal impedance of a telephone circuit is set as 1/N of the feedback impedance of the amplifier 13.

    78.
    实用新型
    失效

    公开(公告)号：JPS61139041U

    公开(公告)日：1986-08-28

    申请号：JP2138785

    申请日：1985-02-18

    IPC分类号： H04M1/20 ,  H04B1/48 ,  H04B3/03