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1. 发明专利

JPH08237684A TELEVISION RECEIVER 失效
公开(公告)号：JPH08237684A
公开(公告)日：1996-09-13
申请号：JP5284196
申请日：1996-03-11
申请人： HITACHI LTD
发明人： YOSHIKI HIROSHI , HIRANO YASUHIRO , SHIGESA HIDEHIKO
IPC分类号： H04N11/04 , H04N9/78
摘要： PURPOSE: To reduce cross talk between luminance signals and chrominance signals and to reduce the decline of resolution at the time of moving pictures and at the time of still pictures by demodulating the chrominance signals and the luminance signals extracted in a space-time filter. CONSTITUTION: From received NTSC signals, the information of still/moving picture modes is extracted by a mode extraction circuit 32 and the chrominance signal and high band luminance signal components are extracted by time filters 33 and 34 for the still picture and for the moving picture. By a changeover switch 35, corresponding to mode information 36, the signals of the time filter 33 are selected at the time of a still mode and the signals of the time filter 34 are selected at the time of a moving picture mode respectively. Then, they are respectively inputted to demodulators 39 and 40, synchronization detection is performed by carrier waves fM1 and fM2 , the signals from the demodulator 39 are passed through a high-pass filter 41 and high band luminance signals 42 are reproduced. Also, the signals from the demodulator 40 are passed through a low-pass filter 43 and the high band components 44 of color difference signals I are reproduced. Also, the other one of the output of the demodulator 48 is inputted to the low-pass filter 50 and the signals Q are reproduced.

2. 发明专利

JPH05252173A 失效
公开(公告)号：JPH05252173A
公开(公告)日：1993-09-28
申请号：JP4475392
申请日：1992-03-02
申请人： HITACHI LTD , HITACHI COMPUTER ELECTRONIC
发明人： FURUSAWA TAKESHI , SHIGESA HIDEHIKO , SATO HIROSHI
IPC分类号： H04L12/42
摘要： PURPOSE:To secure equitability in the transmission of data at each node in a ring transmission system such as a ring LAN, etc. CONSTITUTION:A slot circulating on a transmission line is provided with a busy bit B and a continuous bit C. The node requesting the transmission transmits the data by acquiring the slot set in an (unused) state and setting the busy bit B at a (being used) state. The slot set in the (being used) is re-used when the node of a transmission origin requests the transmission, and the value of the continuous bit C is added. When the continuous bit C coincides with the upper limit value of the continuous number of times of transmission set in advance, the slot is set in a state of (re-use impossible), and it is released and is returned to the state (unused). Also, when transmission data is interrupted, the slot is released, and is set in the state (unused) even when the continuous bit C is less than the upper limit value.

3. 发明专利

JPH04199936A HIGH SPEED RING LAN AND SLOT ACCESS CONTROL METHOD IN HIGH SPEED RING LAN 失效
公开(公告)号：JPH04199936A
公开(公告)日：1992-07-21
申请号：JP32599790
申请日：1990-11-29
申请人： HITACHI LTD
发明人： SHIGESA HIDEHIKO , TAKIYASU YOSHIHIRO , AMADA EIICHI , HATAKEYAMA YASUHIKO , TAKANISHI ISAO , TAKADA OSAMU
IPC分类号： H04L12/42
摘要： PURPOSE:To make management information transmission efficient by transmitting asynchronous information, synchronous information and management information by means of a slot and hourly matching a repeating line and a reception line in a delay block. CONSTITUTION:Access blocks 210 transferring an information slot to node devices 200 with transmission lines 300, ports 220 connecting the access blocks 210 with communication equipments 500 and a control block 230 controlling the transmission/reception of management information used for controlling the node devices 200 are provided. A branching means 213 branching a reception slot into that for repeating and that for reception and the delay block 215 delaying the necessary delay amount of the reception slot branched for repeating until a synchronous slot returns to the access block 210 again from the access block 210 via the synchronous ports 220 connecting the communication equipments for synchronous information 500 are provided for the access blocks 210. Thus, management information transmission is made efficient.

4. 发明专利

JPS63313977A TELEVISION SIGNAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPS63313977A
公开(公告)日：1988-12-22
申请号：JP14894687
申请日：1987-06-17
申请人： HITACHI LTD
发明人： YOSHIKI HIROSHI , HIRANO YASUHIRO , SHIGESA HIDEHIKO , FUKINUKI NORIHIKO
IPC分类号： H04N7/00 , H04N7/015 , H04N9/78 , H04N11/04
摘要： PURPOSE:To eliminate missing in detecting the move in a receiver, and to improve the quality of a reproduced picture by detecting a moving component not detectable on the reception side preliminarily on the transmission side, and adding an additional signal that uses a color signal with which a moving can be detected on the reception side, then transmitting the component. CONSTITUTION:Signals R, G, B which are the image signals obtained by scanning by a sequential scanning camera 1 at a frame period of 1/60sec., are converted to a luminance signal Y and color difference signals I, Q in a conversion circuit 2, and inputted to a scanning conversion circuit 5. A moving detection circuit 4, upon detecting the time frequency 30Hz-component of the Y-signal, closes a switch 6 so that the additional signal Q' from a signal generator 3 is transmitted to an adder 7. In the adder 7, a Q-signal from the circuit 5 and the additional signal Q' are added with each other, and thus obtained color signal Q' is inputted to an encoder 8 together with a luminance signal Y' and another color signal I'. The color signals I', Q' are modulated in the encoder 8 by using a color subcarrier wave fsc, and multiplexed with the luminance signal, then transmitted. The additional signal added to the Q-signal is made such a signal as detectable in a moving detection (difference between two frames) on the reception side.

5. 发明专利

JPH09269930A METHOD AND DEVICE FOR PREVENTING VIRUS OF NETWORK SYSTEM 失效
公开(公告)号：JPH09269930A
公开(公告)日：1997-10-14
申请号：JP8118496
申请日：1996-04-03
申请人： HITACHI LTD
发明人： KONDO TAKESHI , SHIGESA HIDEHIKO
IPC分类号： G06F21/22 , G06F9/06 , G06F13/00 , G06F15/00 , G06F21/20
摘要： PROBLEM TO BE SOLVED: To construct a computer network system whose resistance against a computer virus is strong. SOLUTION: A frame repeater 100 has a means 202 for checking whether the computer virus is contained in a repeating frame or not and a warning message frame generation means 203 started at the time of detecting a virus frame. A means for receiving and displaying a warning message is provided in a computer connected to a network. Since the invasion of the computer virus, the diffusion and the influence range of damage can be set to minimum, the computer network system of high safety and reliability, which is provided with a resistance means for computer virus can be provided.

6. 发明专利

JPH08139718A CIPHER DEVICE AND INTER-TERMINAL COMMUNICATION METHOD USING THE CIPHER DEVICE 失效
公开(公告)号：JPH08139718A
公开(公告)日：1996-05-31
申请号：JP29578494
申请日：1994-11-04
申请人： HITACHI LTD
发明人： TAKARAGI KAZUO , NANBA AKIRA , SHIGESA HIDEHIKO
IPC分类号： G09C1/00 , H04L9/00 , H04L9/08 , H04L9/10 , H04L9/12
摘要： PURPOSE: To reduce the load on a key management center, to facilitate ciphering of a secret key by means of an IC card, and to reduce the processing quantity and time even in a broadcast cipher communication mode. CONSTITUTION: A key manager 113 writes a secret key 126 into an external memory 111 and carries it to an IC card 106. When the secret key 126 is inputted to the card 106 from the memory 111, the key 126 is ciphered by a stored master key 121 and a card specific number 129. This ciphering result is outputted. A ciphered key 125 is written into an external memory 110 and managed by a user 130. When the user 130 performs the cipher communication with another user 131, the key 125 stored in the memory 110 is inputted to the card 106 and then coded and stored by the key 121 and the number 129. Then a session key is generated for the cipher communication and ciphered by the key 126. The session key is sent to the opposite party of communication, and the card 106 receives the ciphered session key and acquires a session key against the one that is decoded by the key 126.

7. 发明专利

JPH06311160A RADIO COMMUNICATION SYSTEM AND RADIO TERMINAL EQUIPMENT 失效
公开(公告)号：JPH06311160A
公开(公告)日：1994-11-04
申请号：JP9406693
申请日：1993-04-21
申请人： HITACHI LTD
发明人： AMADA EIICHI , TAKIYASU YOSHIHIRO , ISHIDO TOMOAKI , ISHII GENICHI , SHIGESA HIDEHIKO , ADACHI SHUICHI
IPC分类号： H04L12/28 , H04L12/46 , H04W52/02 , H04W74/04 , H04W74/08 , H04W84/12 , H04W88/08
摘要： PURPOSE:To reduce power consumption by controlling the power of a transmitter/receiver in radio LAN. CONSTITUTION:The addresses of data transmitted by a frame are collectively displayed at the head of the frame by using the frame of a fixed length. The transmitter-receiver of a terminal cuts the power of reception parts 807 and 808 at unnecessary time based on the information by making a transmission/ reception part 802 control a power control part 809. Thus, power consumption can be reduced by outing off the power of the reception part when received data does not exist.

8. 发明专利

JPH06261043A RADIO CHANNEL LAN SYSTEM AND ITS CONTROL METHOD 失效
公开(公告)号：JPH06261043A
公开(公告)日：1994-09-16
申请号：JP4489493
申请日：1993-03-05
申请人： HITACHI LTD
发明人： SHIGESA HIDEHIKO , AMADA EIICHI , TAKIYASU YOSHIHIRO , ISHIDO TOMOAKI , ISHII GENICHI , ADACHI SHUICHI
IPC分类号： H04L12/28 , H04L12/46 , H04W4/06 , H04W4/16 , H04W8/02 , H04W8/26 , H04W12/00 , H04W12/06 , H04W12/08 , H04W24/00 , H04W28/04 , H04W60/00 , H04W72/04 , H04W74/00 , H04W84/12 , H04W88/08 , H04B7/26 , H04Q7/04
摘要： PURPOSE:To attain re-transmission in a MAC layer by a base station equipment by providing a mobile terminal equipment management database and a mobile terminal equipment verification database to the base station equipment and providing a management source recognition database to a mobile terminal equipment respectively. CONSTITUTION:A base station equipment 10 executes re-transmission only to a mobile terminal equipment 20 registered in a mobile terminal equipment management database. Then since no re-transmission is applied to the mobile terminal equipment 20 not under the management of the base station equipment 10, useless communication is not executed. Furthermore, the base station equipment 10 collates the mobile terminal equipment management database with a mobile terminal equipment verification database and permits the registration of the mobile terminal equipment management database only to the mobile terminal equipment registered already in the mobile terminal equipment verification database. Since number of the mobile terminal equipments 20 under the management of the base station equipment 10 is limited, collision between transmission requests by the mobile terminal equipments 20 is reduced.

9. 发明专利

JPH05136797A MULTIPLE RING LAN AND DATA TRANSMISSION METHOD FOR MULTIPLE RING LAN 失效
公开(公告)号：JPH05136797A
公开(公告)日：1993-06-01
申请号：JP29593191
申请日：1991-11-12
申请人： HITACHI LTD
发明人： SHIGESA HIDEHIKO , TAKIYASU YOSHIHIRO
IPC分类号： H04L12/42
摘要： PURPOSE:To quicken the transmission speed by providing a loop access block accessing simultaneously plural slots on a transmission line and an adaptor connecting the block and an external communication equipment to a node. CONSTITUTION:Plural nodes 100 are connected in a ring by plural transmission lines 200 multiplexed and synchronized with each other. Each node 100 is provided with a loop access block 110 used to access the slots on the plural transmission lines simultaneously and adaptors 120H, 120L connecting the block 110 and a single external communication equipment. The adaptor 120H connects the loop access block 110, a host computer 300 and a peripheral equipment 400 and handles plural transmission lines 200 totally and the adaptor 120L connects the loop access block 110 and an external communication equipment such as a branch line LAN 500. Since the adaptor accesses simultaneously the plural transmission lines, a sum of the transmission speeds of the plural transmission lines, that is, a high transmission speed is obtained.

10. 发明专利

JPS62268281A DETECTION CIRCUIT FOR MOVING OF TELEVISION SIGNAL 失效
公开(公告)号：JPS62268281A
公开(公告)日：1987-11-20
申请号：JP11077186
申请日：1986-05-16
申请人： HITACHI LTD
发明人： HIRANO YASUHIRO , YOSHIKI HIROSHI , SHIGESA HIDEHIKO , FUKINUKI NORIHIKO
IPC分类号： H04N7/015 , H04N7/00 , H04N19/50
摘要： PURPOSE:To detect a moving information corresponding to the speed of the moving by measuring the length of a period during which the absolute value of an in-frame differential signal exceeds a specific value. CONSTITUTION:A one farme delay signal from a one frame delay circuit and a current signal are inputted to a differential circuit 2 to generate an in-frame differential signal. This differential signal is converted by a threshold circuit 3 to a binary signal in a manner that, if its absolute value exceeds TH, it is made '1', but made '0' in other cases. A speed detection circuit 5 generates a speed information (k) corresponding to the length of the run of the '1'. The extent of the binary signals in '1' corresponds to the amount of moving within one frame. Therefore, by means of the length of the extent of the '1', i.e. by measuring the length of the run of the '1', the amount of moving per frame, in other word the speed of the moving, can be detected.

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