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1. 发明专利

JPH09307654A REPEATER FOR MAGNETIC TYPE TRANSMISSION LINE 失效
公开(公告)号：JPH09307654A
公开(公告)日：1997-11-28
申请号：JP12130996
申请日：1996-05-16
申请人： NIPPON ELECTRIC ENG
发明人： TORII SHINJI
IPC分类号： H04M7/00
摘要： PROBLEM TO BE SOLVED: To provide the repeater in the magnetic transmission line in which a call of a receiver side magnetic telephone set is avoided even on the occurrence of an interruption state in a control line. SOLUTION: While a magnetic telephone set 1 sends a call signal, a rectifier circuit 21 of a repeater 2 at a transmitter side converts a call signal into a DC to activate an A relay 23, resulting that a pulse generator 24 connects to a terminal (signal sending) SS through a make contact (a) in place of an earth level having been connected to the terminal SS. A repeater 3 at a receiver side uses a pulse detector 34 to monitor a terminal SR(signal reception), and a B relay 33 is restored when the detector 34 detects a first pulse at the terminal SR within a prescribed time T1 to allow a break contact (b) to connect a signal transmitter 32 to the receiver side magnetic telephone set 4, resulting that a call signal sent from the signal transmitter 32 causes the magnetic telephone set 4 to ring for the information of the calling and this state continues till the call signal from the caller magnetic telephone set 1 is lost.

2. 发明专利

JPH05207164A IN-BAND SIGNAL EQUIPMENT 失效
公开(公告)号：JPH05207164A
公开(公告)日：1993-08-13
申请号：JP1037292
申请日：1992-01-23
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： FUDA HITOSHI , TORII SHINJI
IPC分类号： H04M7/00
摘要： PURPOSE:To reduce nuisance noise by removing a component within the range of a frequency which is higher than the frequency of ring-back tone among quantization noise components which deteriorate call quality at the time of a calling operation. CONSTITUTION:A transmitting circuit 10 transmits at least one single frequency signal corresponding to presence or absence of a signaling signal. In a receiving circuit 20, an analog signal supplied to a terminal 7 is converted into a digital signal in an A/D converter 21. An output signal from the A/D converter 21 is supplied to a detecting circuit 22 and presence or absence of the single frequency signal is detected. The output signal from the A/D converter 21 is supplied to a digital filter 23, its single frequency signal is removed and, moreover, it is supplied to a low-pass filter 24 where the frequency of ring-back tone is removed. The outputs of the filter 23 and the output of the A/D converter 21 are changed-over in accordance with the output of the detecting circuit 22.

3. 发明专利

JPH0479434A POWER BREAK MONITOR SYSTEM 失效
公开(公告)号：JPH0479434A
公开(公告)日：1992-03-12
申请号：JP18936790
申请日：1990-07-19
申请人： NIPPON ELECTRIC ENG
发明人： TORII SHINJI , KOBAYASHI EIICHI
IPC分类号： H04B17/00
摘要： PURPOSE:To discriminate a power break on the other-party station side and a signal break due to trouble of abnormality of a signal processing part or the like or trouble of a transmission line on the local station side by sending the output signal of a break signal generating circuit through a low pass filter and detecting it by a break signal detecting circuit on the reception side to generate a power break alarm. CONSTITUTION:The transmission side is provided with a break signal generating circuit 9 which receives the voltage supply from a capacitor 7 at the time of a power break, a second contact circuit 5 of a relay 2 which selects the output of the circuit 9 or the output of a main signal transmission circuit 1, and a low pass filter 8. The reception side is provided with a main signal reception circuit 10 and a break signal detecting circuit 11, and the circuit 9 is operated by the electric charge charged to the capacitor 7 at the time of a power break on the transmission side. The output signal of the circuit 9 is sent to the transmission line through the contact circuit 5 and the low pass filter 8, and the power break signal is detected by the circuit 11 on the reception side to generate the power break alarm. Thus, a power break on the other-party station side and a signal break due to trouble of abnormality of the signal processing part or the like or trouble of the transmission line are discriminated on the local station side.

4. 发明专利

JPH10308820A REPEATER 失效
公开(公告)号：JPH10308820A
公开(公告)日：1998-11-17
申请号：JP11902697
申请日：1997-05-09
申请人： NIPPON ELECTRIC ENG
发明人： TORII SHINJI
IPC分类号： H04M3/10 , H04M3/00 , H04Q3/42
摘要： PROBLEM TO BE SOLVED: To prevent useless calls from being produced on the occurrence of interruption of a leased line. SOLUTION: A signal processing circuit 12 generates an alarm signal 18 on the occurrence of interruption of a leased line 8, the alarm signal 18 drives a relay 20 to switch a contact r2 to an output of a pulse generator 19. Thus, the pulse from the pulse generator 19 is detected by a detector 15 and a relay 14 is driven. Then a closed line 24 is formed by contacts r1 to bring an exchange 2 into a closed state. Thus, calls from telephone sets connecting to the exchange 2 may not arise.

5. 发明专利

JP2002152146A RECEIVED SIGNAL INTERRUPTION IDENTIFYING SYSTEM 失效
公开(公告)号：JP2002152146A
公开(公告)日：2002-05-24
申请号：JP2000348891
申请日：2000-11-16
申请人： NIPPON ELECTRIC ENG
发明人： TORII SHINJI
IPC分类号： H04B17/00 , H04B3/46 , H04Q1/45
摘要： PROBLEM TO BE SOLVED: To provide a received signal interruption identifying system capable of facilitating maintenance dealing when a received signal is interrupted. SOLUTION: A capacitor 7 charged from a power source circuit 3 through a contact circuit 6 in a transmitting part supplies a voltage to a stop signal generating circuit 9 by switching the contact of the contact circuit 6 in response to power source off. By the voltage supplied from the capacitor 7, the stop signal generating circuit 9 generates and sends out the stop signal for identifying power supply stop. Besides, in the transmitting part, a multi-frequency signal sending circuit 2 generates a prescribed specified pattern (signal for identifying transmission line cut) independently and intermittently combining respective plural frequencies of a multi-frequency signal to be sent out at prescribed time.

6. 发明专利

JPH03247025A LINE INTERRUPT MONITOR 失效
公开(公告)号：JPH03247025A
公开(公告)日：1991-11-05
申请号：JP4321190
申请日：1990-02-23
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： FUDA HITOSHI , KOBAYASHI EIICHI , TORII SHINJI
IPC分类号： H04B3/46
摘要： PURPOSE:To monitor line interrupt stably by superimposing a pilot signal onto a main signal at a sender side and suppressing the component of the pilot signal at a receiver by calculation. CONSTITUTION:A pilot signal (b) is superimposed on a main signal (a) and sent by a sender side coupling circuit 3 and a receiver side monitors a level change in the pilot signal (b) to discriminate the presence of line interruption. Then a signal whose level and frequency are equal to the pilot signal (b) superimposed on the main signal (a) and whose phase differs therefrom by 180 deg. is obtained and an adder circuit 6 is used to add the obtained signal to the pilot signal (b) or a signal whose level, frequency and phase are equal is subtracted from the pilot signal (b) to obtain a signal (e) not including the pilot signal (b) in the received output signal. Thus, the line interruption is monitored stably without giving effect onto the transmission of the substantial main signal.

7. 发明专利

JPH04123620A AMPLITUDE EQUALIZING SYSTEM 失效
公开(公告)号：JPH04123620A
公开(公告)日：1992-04-23
申请号：JP24553090
申请日：1990-09-14
申请人： NIPPON ELECTRIC ENG
发明人： MIYASHITA YOSHINAO , TORII SHINJI , KOBAYASHI EIICHI
IPC分类号： H04B3/10
摘要： PURPOSE:To automatically execute the amplitude equalization of a transmission line by correcting a line loss frequency characteristic in accordance with a compared level difference on a receiving side with respect to a first and a second signals of a high frequency and a low frequency set to a transmission line on a transmitting side. CONSTITUTION:An output signal (g) of a MODEM passes through a cable 10 and is supplied to an equalizing circuit 11, an equalized output signal (h) from the equalizing circuit 11 is supplied to a band pass filter 13 for extracting only a frequency fL and a band pass filter 14 for extracting only a frequency fH, and outputs from the filters are converted to a DC voltage Vi being proportional to amplitude of a timing pilot signal and a DC voltage VJ being proportional to amplitude of a carrier pilot signal by rectifying circuits 15, 16, respectively. A differential amplifier 17 generates a control voltage VK being proportional to a voltage difference of the supplied DC voltages Vi, VJ and controls a variable resistance circuit 12.

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