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1. 发明专利

JPS62237809A PHASE COMPARATOR 失效
公开(公告)号：JPS62237809A
公开(公告)日：1987-10-17
申请号：JP7997886
申请日：1986-04-09
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： HIRAI MASATO , IRIKURA SHOGO
IPC分类号： H03K5/26 , H03L7/08 , H03L7/089 , H04L7/02 , H04L7/033
摘要： PURPOSE:To obtain a phase comparator having equal UP/DOWN pulse width by using three logic elements of one kind having the same delay time. CONSTITUTION:FFs 21, 22, 26 are D edge trigger FFs, an UP signal 11 goes to an H level in a time T0 after the leading edge of a data 8, a DOWN signal 12 goes to an H level in a time T0 after the leading edge of a clock 18 and the UP signal 11 goes to an L level after a time T1 further. A Reset DOWN signal 25 goes to an L level in a time T0 after the leading of an inversion 27 of the clock 18 and the DOWN signal 12 goes to an L level after the time T1, then a series of operation is finished. In comparing the pulse width of the UP signal 11 and the DOWN signal 12, the delay time till the leading edge is T0 and the delay time up to the trailing is T0+T1, and the duty cycle of the clock 18 is 50%, and when the phase difference between the clocks 18, 27 is 180 deg., both the pulse widths are equal to each other.

2. 发明专利

DE3926091C2 未知
公开(公告)号：DE3926091C2
公开(公告)日：1997-09-04
申请号：DE3926091
申请日：1989-08-07
申请人： HITACHI LTD , HITACHI COMPUTER ELECTRONIC
发明人： HIRAI MASATO , BEKKI YOSHINORI , IKEZAWA SINZI , MORIGUCHI TERUO
IPC分类号： H04L12/437 , H04L25/24 , H04L29/14 , H04L12/28 , H04L25/08
摘要： A regenerative repeater for regeneratively repeating a signal to be transmitted is inserted in two ring-like transmission lines, and is provided with loop back means for automatically separating the regenerative repeater from the ring-like transmission lines in the condition that a power supply is in a not-yet-turned-on state, so that closed ring-like transmission lines are formed in the form where the regenerative repeater is removed in the condition that the power supply is in the not-yet-turned-on state.

3. 发明专利

DE3670743D1 未知
公开(公告)号：DE3670743D1
公开(公告)日：1990-05-31
申请号：DE3670743
申请日：1986-08-05
申请人： HITACHI LTD , HITACHI COMPUTER ENG
发明人： HIRAI MASATO , KURATA MASAMI , YOSHINO RYOZO
IPC分类号： H04L12/42 , H04L12/28

4. 发明专利

DE3926091A1 未知
公开(公告)号：DE3926091A1
公开(公告)日：1990-03-15
申请号：DE3926091
申请日：1989-08-07
申请人： HITACHI LTD , HITACHI COMPUTER ELECTRONIC
发明人： HIRAI MASATO , BEKKI YOSHINORI , IKEZAWA SINZI , MORIGUCHI TERUO
IPC分类号： H04L12/437 , H04L25/24
摘要： A regenerative repeater for regeneratively repeating a signal to be transmitted is inserted in two ring-like transmission lines, and is provided with loop back means for automatically separating the regenerative repeater from the ring-like transmission lines in the condition that a power supply is in a not-yet-turned-on state, so that closed ring-like transmission lines are formed in the form where the regenerative repeater is removed in the condition that the power supply is in the not-yet-turned-on state.

5. 发明专利

DE3821636A1 未知
公开(公告)号：DE3821636A1
公开(公告)日：1989-01-05
申请号：DE3821636
申请日：1988-06-27
申请人： HITACHI LTD
发明人： BEKKI YOSHINORI , WADA HIROYUKI , HIRAI MASATO
IPC分类号： H04L12/437 , H04B3/00 , H04L25/02
摘要： In a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of line concentrators connected in the form of a loop by the two transmission lines and each accommodating a plurality of terminal stations connected to one of the two transmission lines, a signal detecting unit and a terminating circuit are disposed in each of the line concentrators on the signal output side of each of the transmission lines so as to be connectable to and disconnectable from the transmission lines, so that, when the signal detecting unit in one of the line concentrators is connected to the associated transmission line, the transmission line is disconnected in the line concentrator, and the terminating circuit is connected to the downstream segment of the disconnected transmission line.

6. 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.

7. 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.

8. 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.

9. 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

10. 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.

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