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1. 发明专利

JP2000101571A SYNCHRONIZATION CONTROL METHOD FOR TERMINAL ADAPTER 失效
公开(公告)号：JP2000101571A
公开(公告)日：2000-04-07
申请号：JP26595798
申请日：1998-09-21
申请人： HITACHI LTD
发明人： SASAHARA KOJI , HIRAI MASATO
IPC分类号： H04L7/00 , H04L12/02 , H04M11/00
摘要： PROBLEM TO BE SOLVED: To normally perform communication in interconnection of terminal adapters between different makes by providing a buffer in the terminal adapter and adjusting a timing between control signals and data signals sent out to an ISDN line and received from the ISDN line matching the opposing terminal adapter. SOLUTION: At the time of transmitting and receiving the control signals and data signals of an ITU-T recommendation V.24 standard, synchronization between the control signals and the data signals is varied. A transmission data buffer 8 and a control signal buffer 11 respectively delay transmission data and the control signals from a V.24 DTE interface 7 corresponding to a delay from a control part 15 and then, send them out to an ISDN frame generation part 9. A reception data buffer 12 and the control signal buffer 14 respectively delay the transmission data and the control signals delivered from an ISDN frame development part 13 corresponding to the delay value from the control part 15 and then, send them out to the V.24 DTE interface 7.

2. 发明专利

JPH08298687A RADIO COMMUNICATION SYSTEM AND MOBILE RADIO TERMINAL 失效
公开(公告)号：JPH08298687A
公开(公告)日：1996-11-12
申请号：JP10192395
申请日：1995-04-26
申请人： HITACHI LTD , HITACHI COMPUTER ENG
发明人： SHIDA MASAAKI , ISHIDO TOMOAKI , HIRAI MASATO , SHIGESA HIDEHIKO , AOYAMA KOJI
IPC分类号： H04W24/02 , H04B1/713 , H04L12/28 , H04W84/20 , H04Q7/38
摘要： PURPOSE: To obtain a frequency hopping mobile communication system capable of automatically functioning a mobile radio station as a base station in accordance with a peripheral condition and automatically reconstituting a communication network. CONSTITUTION: The system consists of base stations 1a, 1b, 2a for generating control frames and radio communication terminals 3a to 3d for hopping frequency in accordance with the control frames. Each radio communication terminal executes the switching operation of a base station to be followed based upon the receiving state of a control frame and relation between the received control frame and the state of the terminal itself, judges which mode, a base station mode or a slave station mode, is to be selected to drive the terminal itself and executes the formation and reconstitution of a cell.

3. 发明专利

JPH04192646A DUPLICATE RING SYSTEM 失效
公开(公告)号：JPH04192646A
公开(公告)日：1992-07-10
申请号：JP31781790
申请日：1990-11-26
申请人： HITACHI LTD , HITACHI COMPUTER ENG
发明人： KURATA MASAMI , HIRAI MASATO
IPC分类号： H04L12/42
摘要： PURPOSE:To prevent system-down by devising the system such that a reproduction repeater delivers a fault to subordinate nodes without implementing loopback or bypassing on the occurrence of a fault such as power failure so as to allow a ring configuration controller to detect the fault surely when the reproduction repeater and the ring configuration controller are in existence in mixture in the system. CONSTITUTION:Stations ST are connected to transmission lines 2 in duplicate by a line concentrator 1 and connected in a ring by using a ring configuration controller 3 checking the normality of a data to configure the ring, and a reproduction repeater 4 to extend the length of the ring. The reproduction repeater 4 does not implement loopback and bypassing on the occurrence of a fault such as a power failure but allows subordinate devices to detect the fault. Since the ring configuration controller 3 recognizes the fault and eliminate a fault location from the ring through loopback, system-down is prevented, the ring is managed and the fault location is easily found out.

4. 发明专利

JPS63190225A LOAD DRIVING CIRCUIT 失效
公开(公告)号：JPS63190225A
公开(公告)日：1988-08-05
申请号：JP1837787
申请日：1987-01-30
申请人： HITACHI LTD
发明人： HIRAI MASATO , YOSHINO RYOZO
IPC分类号： H01H47/00 , H04L12/42

5. 发明专利

JPH0997232A SIGNAL TRANSMITTING METHOD AND EXECUTING DEVICE FOR THE SAME 失效
公开(公告)号：JPH0997232A
公开(公告)日：1997-04-08
申请号：JP25222795
申请日：1995-09-29
申请人： HITACHI LTD
发明人： TAMURA YASUAKI , SUZUKI YASUSHI , HIRAI MASATO
IPC分类号： G06F13/40 , H04B15/00
摘要： PROBLEM TO BE SOLVED: To suppress electromagnetic radiation noise and electromagnetic induction noise and simultaneously to transmit much more signals without changing the number of signal transmission lines. SOLUTION: A high frequency signal outputted from a high frequency signal output device 110 is transmitted to a high frequency signal input device 210 by a first signal transmission line 311, the return current of the high frequency signal from the high frequency signal input device 210 is transmitted through an input side capacitor C21 connected to the high frequency signal input device 210 and an output side capacitor C11 connected to the high frequency signal output device 110, to the high frequency signal output device 110 by a second signal transmission line 312, and a DC signal or a low frequency signal outputted by the signal output device 110 is transmitted to the signal input device 210 by the second signal transmission line 312 without interposing the output side capacitor C11 and the input side capacitor C21.

6. 发明专利

JPH07303115A CHANGEOVER SYSTEM FOR TRANSMISSION LINE 失效
公开(公告)号：JPH07303115A
公开(公告)日：1995-11-14
申请号：JP9504294
申请日：1994-05-09
申请人： HITACHI LTD , HITACHI COMPUTER ELECTRONIC
发明人： NAKAUCHI TOSHIHIKO , HIRAI MASATO , SHIGUMA TAKASHI , KAMIYA AKIRA
IPC分类号： H04L12/437
摘要： PURPOSE:To provide an inexpensive transmission line changeover system of a constitution capable of using a connector not having an external power terminal exclusive for a switch circuit. CONSTITUTION:A power application/non-application state in a connector 12 is discriminated via control terminals 124, 125 of the connector 12 and when power of the connector 12 is applied normally, switches 1-4 are controlled to be closed, and a single ring LAN including a transmission line changeover device 11 is built up. When the power is not applied to the connector 12, the switches 1, 4 and 2, 3 are controlled to be closed with each other, then the connector 12 is disconnected from the ring type LAN and the transmission line changeover device 11 connects the connectors 13, 14.

7. 发明专利

JPH01170106A DIFFERENTIAL AMPLIFIER CIRCUIT 失效
公开(公告)号：JPH01170106A
公开(公告)日：1989-07-05
申请号：JP32708487
申请日：1987-12-25
申请人： HITACHI LTD , HITACHI COMPUTER ENG
发明人： HIRAI MASATO , KURATA MASAMI
IPC分类号： H03F3/45
摘要： PURPOSE:To obtain a differential amplifier circuit in which the balance of both outputs of differential outputs are good by packing circuit elements connecting between the emitters of a pair of transistors to an object physically to the emitters of a pair of the transistors. CONSTITUTION:By connecting between the emitters of a pair of transistors Q1 and Q2 to compose the differential amplifier circuit by means of circuit elements (an R1, an R2 and a C), an amplification degree is controlled. At such a time, the circuit elements (the R1, R2 and C) are packed to the object physically to the emitters of the transistors Q1 and Q2. Then, the floating capacity to a ground to accompany the packing of the circuit elements (the R1, R2 and C) is attached to the object to both emitters. The ground impedances of both emitters are also made equal, and the balance of the impedances between both emitters are made good. Thus, the differential amplifier circuit can be obtained in which the balance of both outputs of the differential outputs are good.

8. 发明专利

JPS6236412B2 失效
公开(公告)号：JPS6236412B2
公开(公告)日：1987-08-06
申请号：JP13971481
申请日：1981-09-07
申请人： HITACHI LTD
发明人： FURUKAWA HIROSHI , KUSAMA TAKEO , HIRAI MASATO , AKYAMA FUMIO
IPC分类号： H04B3/46 , H04L1/14 , H04L1/24 , H04L29/14

9. 发明专利

JPS6243236A RELAY CONNECTION SYSTEM 失效
公开(公告)号：JPS6243236A
公开(公告)日：1987-02-25
申请号：JP18180785
申请日：1985-08-21
申请人： HITACHI LTD , HITACHI COMPUTER ENG
发明人： HIRAI MASATO , KURATA MASAMI , YOSHINO RYOZO
IPC分类号： H04L12/42
摘要： PURPOSE:To offset the crosstalk produced by a relay circuit with no attachment of an external parts by a relay connection system in a trunk coupling unit of a token ring. CONSTITUTION:The signal A sent from a transmission part 5 of a station 1-1 is transmitted to a reception part 4 of a station 1-2 through relays 5 and 8. While the signal B sent from a transmission part 5 of the station 1-2 is transmitted to the reception part 4 of a station 1-3 through relays 7 and 9. Here the positive side crosstalk C(+) of the signal B is produced to a terminal (c) from a terminal (b) of both relays 6 and 7 respectively. While the negative side crosstalk C(-) of the signal B is produced to a terminal (c) from a terminal (b) of both relays 8 and 9 respectively. Then both crosstalks C(+) and C(-) are added together between relays 6 and 9 as well as relays 7 and 8 through connections 14 and 15 and offset with each other. Thus no crosstalk C of the signal B is produced at the reception part 4 of the station 1-2.

10. 发明专利

JPS61216524A PHASE LOCK DETECTING CIRCUIT 失效
公开(公告)号：JPS61216524A
公开(公告)日：1986-09-26
申请号：JP5584185
申请日：1985-03-22
申请人： HITACHI LTD
发明人： HIRAI MASATO , YOSHINO RYOZO
IPC分类号： H03L7/113 , H03L7/089 , H03L7/095
摘要： PURPOSE:To set a phase lock detection range and also to set an adaptive frequency range without any adjustment only by varying the setting of a delay time by solving problems of a conventional analog system by employing a digital system. CONSTITUTION:A frequency phase comparator 1 outputs signals D and U according to the phase relation between an input signal and the output of a VCO. Those outputs D and U are ORed and a signal 10 which is delayed by a time (t) is sampled by flip-flops 7 and 8 with the leading edge of the VCO output. When the phase difference between the input signal and VCO output is smaller than the delay time (t), the signal 10 is '0' at a sampling point of time, so signals 11 and 12 are both '0' and the output of an AND circuit 9 is '1', so that is detected as a phase lock state. When the phase difference is larger than the delay time (t), the input signal is sampled to obtain '0', but the output side of the VCO is sampled to detect '1' as the signal 10, which is not detected as the phase lock state. Namely, the range wherein the phase lock state is detected is determined only by the delay time (t).

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