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1. 发明专利

JPS59229964A VOICE SWITCH CIRCUIT 失效
公开(公告)号：JPS59229964A
公开(公告)日：1984-12-24
申请号：JP10449783
申请日：1983-06-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MATSUO NAOKI , MATSUMOTO KOUICHI
IPC分类号： H04M1/60 , H04M9/08
摘要： PURPOSE:To attain invariably optimum prevention against transmission disturbance by allowing the voice switch circuit of a telephone set to measure the transmission delay time of an echo pulse between telephone sets, and setting automatically insertion loss corresponding to the measured delay time in a variable loss circuit. CONSTITUTION:When telephone sets A and B are connected mutually by the voice switch circuits of telephone sets which are capable of simultaneous calling and prevent the beginning and ending of a word from being cut and a speech path is formed, a signal generating circuit 174 sends a preset signal to a two- wire/four-wire converting circuit 13 and echoed around to the reception side of a repeating circuit 70. The returned preset signal is detected by a signal detecting circuit 176, and a timer 177 stops measuring the time and sends the transmission delay time Td of the echo pulse to a control circuit 178. The control circuit 178 sets the insertion loss corresponding to the time Td in variable loss circuits 171 and 172 and operates a changeover switch 175 as to transmit a transmit signal from a microphone 11 to a converting circuit 13.

2. 发明专利

JPS5466477A PUSHHBUTTON SWITCH 失效
公开(公告)号：JPS5466477A
公开(公告)日：1979-05-29
申请号：JP13310677
申请日：1977-11-08
申请人： IWATSU ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HARA OSAMU , MATSUMOTO KOUICHI
IPC分类号： H01H13/52 , H01H13/12 , H01H13/20 , H04M1/23

3. 发明专利

JPS52126779A LINEAR CORD 失效
公开(公告)号：JPS52126779A
公开(公告)日：1977-10-24
申请号：JP4326876
申请日：1976-04-15
申请人： NIPPON TELEGRAPH & TELEPHONE , OKI ELECTRIC CABLE
发明人： OOSHIMA HIROSHI , MATSUMOTO KOUICHI , AKACHI HISATERU , NITSUTA YOSHIHIRO
IPC分类号： H01B7/00 , H01B7/04 , H01B7/18
摘要： PURPOSE:To prevent a core from being slipped from a sheath while maintaing its flexibility by integrally froming vertical, metallic wire having a high tension-proof force in the sheath.

4. 发明专利

JPS51144106A TONE RINGER TELEPHONE 失效
公开(公告)号：JPS51144106A
公开(公告)日：1976-12-10
申请号：JP6754475
申请日：1975-06-06
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MATSUMOTO KOUICHI , KAWASHIMA ISAO , YOSHIRI MAKOTO , MATSUDA RIYOUICHI , TERAI MASAAKI
IPC分类号： H04M1/00 , H04M19/04
摘要： PURPOSE:Telephone receiver which shares tone ringer with dial oscillator without increasing contacts of hook switch and limiting contact sequence of dial switch.

5. 发明专利

JPS6070973A DC/DC CONVERTER 失效
公开(公告)号：JPS6070973A
公开(公告)日：1985-04-22
申请号：JP17632283
申请日：1983-09-26
申请人： OKI ELECTRIC IND CO LTD , NIPPON TELEGRAPH & TELEPHONE , TOHOKU OKI ELECTRIC CO
发明人： IWANAGA SATOSHI , FUJISAKI TADANORI , MATSUMOTO KOUICHI , AMAMIYA FUJIO , IWASA SADAYUKI , NAGATSUKA HITOSHI
IPC分类号： H02M3/337
摘要： PURPOSE:To improve the conversion efficiency by providing a winding for a transformer exclusive for an FET, and self-oscillating under resonance condition of a floating capacity intrinsic for the FET and the inductance of the transformer. CONSTITUTION:When a DC voltage Vcc is applied between the drains and the sources of FET1, FET2, the voltage is applied also through resistors R1, R2 and capacitors C1, C2 to the gates, and since the used FETs are of MOS enhancement type, the drain current is not flowed when the voltage between the gate and the source is 0V, but when the voltage between the gate and the source of either FET exceeds the threshold of the FET, it becomes ON, and an oscillation is continued under the resonance condition of the floating capacity intrinsic for the FET and the inductance of the transformer by the start.

6. 发明专利

JPS59229939A DIGITAL SIGNAL MIXING SYSTEM 失效
公开(公告)号：JPS59229939A
公开(公告)日：1984-12-24
申请号：JP10449683
申请日：1983-06-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NISHI HIROYUKI , MATSUO NAOKI , MATSUMOTO KOUICHI
IPC分类号： H04M3/56 , H04B14/06 , H04B12/04
摘要： PURPOSE:To reduce the scale of a circuit by providing a means which synchronizes two digital signals with each other, and outputting one digital signal from a logical circuit accoridng to the digital values of the two synchronized digital signals. CONSTITUTION:Analog signals e1 and e2 applied to input terminals 11 and 12 are digitized by DELTAM.A/D converting circuits 13 and 14 respectively. The DELTAM. A/D converting circuits 13 and 14 operates with the same clock through a synchronizing circuit 15 and synchronized digital signals appear at digital signal input terminals 13 and 14. Those two synchronized digital signals are supplied to the logical circuit 18, which outputs 1 when both are 1, 0 when both are 0, or 1 and 0 alternately when one is 1 and the other is 0; the scale of the circuit is reduced, and used on time-division basis because the digital signals are mixed as they are.

7. 发明专利

JPS58145266A HOOK SWITCH CIRCUIT FOR DIGITAL TELEPHONE SET 失效
公开(公告)号：JPS58145266A
公开(公告)日：1983-08-30
申请号：JP2715282
申请日：1982-02-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AMAMIYA FUJIO , MATSUMOTO KOUICHI
IPC分类号： H04M1/00 , H04M1/253 , H04M19/04
摘要： PURPOSE:To reduce impulse noise induced by rapid voltage change, by changing a voltage between terminals of a telephone set when a DC loop is formed at incoming and outgoing calls gradually based on a charging time constant of a capacitor. CONSTITUTION:When a hook switch 7 is set on and a DC loop is formed at outgoing call, a current flows to a relay 13 and a capacitor 25 is connected in parallel with L1, L2 terminals. A voltage (e) between the terminals L1, L2 is changed based on the charging time constant of a capacitor 25. Further, a capacitor 19 is discharged via a resistor 20. When the switch 7 is set off, the voltage (e) is changed based on the charging time constant of the capacitor 19. Further, the capacitor 25 is discharged via a resistor 26. When the polarity of the voltage between the L1 and L2 at call incoming, the voltage (e) is changed based on the charging time constant of the capacitor 25. Further, the capacitor 19 is discharged via the capacitor 19 and the resistor 20. When the switch 7 is set on, the contact of the relay 13 keeps the non-busy state of telephone set. When the call is finished, the voltage (e) is changed with the charging time constant of the capacitor.

8. 发明专利

JPS5863257A DIGITAL TELEPHONE TERMINAL DEVICE 失效
公开(公告)号：JPS5863257A
公开(公告)日：1983-04-15
申请号：JP16320081
申请日：1981-10-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AMAMIYA FUJIO , MATSUMOTO KOUICHI
IPC分类号： H04M1/00 , H04M1/253
摘要： PURPOSE:To decrease the number of interface lines and to reduce the power consumption, by connecting the network terminal part with a digital telephone termina part via a DC separating balance/unbalance converting circuit. CONSTITUTION:A network terminal part 19 and a digital telephone terminal part 20 contain the DC separating balance/unbalance converting circuits 49 and 50 respectively. The circuits 49 and 50 are connected to each other via two interface lines. When a call is transmitted, a switch 1 colses, a DC loop is formed between a switchboard and the part 20 via an electric power separating balance/ unbalance converting circuit 4 plus the circuits 49 and 50. Then the power is supplied from the switchboard side to actuate the part 20. On the other hand, the electric power is supplied to a power supply circuit 7 of the part 19 from the switchboard side via the circuit 4 and a polarity coincidence diode circuit 3 in the incoming mode and with the inversion of polarity of the line voltage at the switchboard side. At the same time, the electric power is supplied to a power supply circuit 54 of the part 20 from the switchboard side via the circuits 4, 49 and 50 plus a polarity coincidence diode circuit 53. Thus both parts 19 and 20 are actuated.

9. 发明专利

JPS5854767A DIGITAL TELEPHONE SET 失效
公开(公告)号：JPS5854767A
公开(公告)日：1983-03-31
申请号：JP15222081
申请日：1981-09-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AMAMIYA FUJIO , OOGOSHI MASAE , NAKANO YOSHIO , KAWASHIMA ISAO , MATSUMOTO KOUICHI , IIZUKA SATOSHI
IPC分类号： H04M1/00 , H04M1/253 , H04M1/52
摘要： PURPOSE:To decrease the number of pairs of interface lines and the power consumption, by connecting a network terminator and a digital terminal device with two sets of interface lines and a DC separation/balance-unbalancing conversion circuit. CONSTITUTION:Through the off-hook at a digital terminal device 20 at transmission, a DC voltage is given to a network terminator 19 via one set of interface line and DC separation/balancing-unbalancing conversion circuits 53, 51, a DC loop is formed between the terminator 19 and an exchange, and power supply is applied from the terminator 19 to a device 20 via another set of interface line and DC separation/balancing-unbalancing conversion circuits 52, 54, allowing to perform transmsission and calls. Further, at incoming call, the terminator 19 detects the inversion of polarity of a line voltage to form a DC loop with the exchange, and the power supply from the terminator 19 to the device 20 via the circuits 52 and 54 to attain communication.

10. 发明专利

JPS57207472A POWER SUPPLY SYSTEM FOR TELEPHONE SET 失效
公开(公告)号：JPS57207472A
公开(公告)日：1982-12-20
申请号：JP9235981
申请日：1981-06-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AMAMIYA FUJIO , MATSUO NAOKI , MATSUMOTO KOUICHI
IPC分类号： H04M19/00
摘要： PURPOSE:To reduce the power for telephone input and the total power consumption per subscriber, by adjusting a DC resistor in a current supply circuit of an exchanger in response to a resistance of a subscriber line. CONSTITUTION:When a hook switch 4 is closed with off-hook and a DC loop between an exchanger and a telephone set is formed, a channel current determined with a voltage of a constant voltage power supply 1, resistance of resistors 2 and 3 and a variable resistor 6 and a DC resistance of a telephone set power supply circuit 11 flows to a subscriber line. A control circuit 10 compares a terminal voltage of the resistor 2 with a reference voltage of a reference voltage generating circuit 9 and when both the voltages are not equal, a trigger signal is outputted. Further, the variable resistor circuit 6 is operated with a trigger signal from the control circuit 10 so that a switch 7 in the variable resistor selects a plurality of resistors, and when the terminal voltage at the resistor 2 and the reference voltage are equal, the circuit 10 stops the transmission of the trigger signal and the switch stops the selection for steady state.

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