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31. 发明专利

JPS63124632A METHOD AND APPARATURS FOR OPTICAL SIGNAL SELECTION 失效
公开(公告)号：JPS63124632A
公开(公告)日：1988-05-28
申请号：JP26963286
申请日：1986-11-14
申请人： HITACHI LTD
发明人： TSUSHIMA HIDEAKI , TAKASE MASAHIKO , IMOTO KATSUYUKI , SANO HIROHISA
IPC分类号： G02F2/00 , G02F1/31 , H04B10/00 , H04B10/27 , H04B10/29 , H04J14/00 , H04J14/02
摘要： PURPOSE:To easily increase number of selected signals by distributing optical frequency division multiplex signal light into plural optical transmission lines and multiplexing a reference light having a desired frequency to each optical transmission line via an optical switch and using the optical oscillator outputting the reference light for the plural optical transmission lines in common. CONSTITUTION:The individual signal is a light having a different frequency modulated by the optical frequency shift keying or phase shift keying method. The signal light is distributed by a light distributer 2 by plural optical transmission lines 6(61-61). The reference light distributed by an optical distributer 8 is transmitted or cut off by optical switches 4(4l1-4m1), where (m) is number of distributed branches. The reference light transmitted through the optical switch 4 is multiplexed to the line 6 by optical multiplexers 5(5l1-5m1). The multiplexed light 7 is the multiplication of the reference light onto the optical frequency division multiplex signal light.

32. 发明专利

JPS6361536A FSK SIGNAL DEMODULATING CIRCUIT 失效
公开(公告)号：JPS6361536A
公开(公告)日：1988-03-17
申请号：JP20365586
申请日：1986-09-01
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO
IPC分类号： H04L27/152 , H04L27/14 , H04L27/156
摘要： PURPOSE:To demodulate a frequency shift keying (FSK) signal with the signal processing of a frequency similar to a carrier frequency and constitute a demodulating circuit of only logic circuit by using a clock, whose frequency is equal to one frequency of the FSK signal, to sample the FSK signal which is converted to pulses by a bandpass filter and a slicer. CONSTITUTION:A clock 3 whose frequency is equal to one frequency of the FSK signal is used to sample the FSK signal, which is converted to pulse by a band-pass filter 1 and a slicer 2, by a sampling circuit 4. Thus, the FSK signal is practically converted to a frequency similar to a data signal. since this signal is lowspeed, demodulation is possible with the signal processing at a speed similar to the carrier frequency. The frequency-converted FSK signal is identified as a binary in the digital counting system by a frequency disidentifying circuit 6. In this case, a required data signal clock timing is extracted from the FSK signal by a data clock extracting circuit 5.

33. 发明专利

JPS6314527A OPTICAL FREQUENCY SELECTIVE RECEPTION SYSTEM 失效
公开(公告)号：JPS6314527A
公开(公告)日：1988-01-21
申请号：JP15780886
申请日：1986-07-07
申请人： HITACHI LTD
发明人： IMOTO KATSUYUKI , TSUSHIMA HIDEAKI , SANO HIROHISA , TAKASE MASAHIKO , MAEDA MINORU
IPC分类号： H04J14/00 , H04B10/00 , H04B10/27 , H04B10/29 , H04J14/02
摘要： PURPOSE:To obtain an optical frequency selective reception system with advantages such as simple constitution, small size, low transmission loss and low cost by making an optical signal subjected to optical frequency division multiplex transmission incident in a wavelength variable diode oscillated at a desired optical frequency by an injection current. CONSTITUTION:Lots of different information are subjected to optical frequency division multiplex transmission in different optical frequencies f1-fn, the optical signals are multiplexed by a 1 X n port optical star coupler 1 and the result is sent to the reception side through an optical fiber 2. The optical signal is made incident in the wavelength variable laser diode 10 at the reception side. An injection current is controlled in the diode 10 by a drive current control circuit 11, the oscillated wavelength of the diode 10 is varied and when the light is tuned to a desired selected optical frequency, the optical signal of the desired optical frequency is amplified. In giving an output of the diode 10 to an optical AND gate element 14. the element 14 suppresses the optical signal of the undesired frequency included somehow in the original signal, the S/N is improved and the output signal is sent to a photoelectric transducing circuit 12. The circuit 12 transduces the optical signal into an electric signal and gives the result to terminal equipments 13-1, 13-2.

34. 发明专利

JPS62183247A PHASE MODULATION SIGNAL DEMODULATING SYSTEM 失效
公开(公告)号：JPS62183247A
公开(公告)日：1987-08-11
申请号：JP2380086
申请日：1986-02-07
申请人： HITACHI LTD , HITACHI TSUSHIN SYSTEM
发明人： TAKASE MASAHIKO , OCHIAI KENJI
IPC分类号： H04L27/22 , H04L27/233
摘要： PURPOSE:To attain complete digital circuit integration by providing a means generating an asynchronous clock with a carrier frequency of a phase modulation signal and detecting the phase difference between the asynchronous clock and the phase modulation signal so as to demodulate a data signal based on the phase difference. CONSTITUTION:A phase difference detector 12 detects the phase difference between a phase identification block and a PSK signal from a phase identification clock generator 11, and a phase difference change detector 13 discriminates the presence of the change in the phase difference in the timing from a timing extraction device 14. Since the phase identification clock is not synchronized with the carrier, the phase difference changes in a frequency being the difference between respective frequencies. The presence of the phase change of a PSK signal is discriminated as the difference between respective phase differences of phase identification clocks (f) of a O phase PSK signal (waveform b0) and a pi phase PSK signal (waveform bpi) and represented as the difference between solid and broken lines. That is, the difference of the phase difference is 0 at the moment of time 0, T/2, T..., and the presence of the phase change is not discriminated. Thus, the error rate of the demodulation system is a degree of the deviation of wave numbers of the phase identification clock (f).

35. 发明专利

JPS62153805A SIGNAL DISTRIBUTING SYSTEM 失效
公开(公告)号：JPS62153805A
公开(公告)日：1987-07-08
申请号：JP29262285
申请日：1985-12-27
申请人： HITACHI LTD
发明人： TSUSHIMA HIDEAKI , MAEDA MINORU , IMOTO KATSUYUKI , TAKASE MASAHIKO
IPC分类号： G02B6/28 , H04B10/00 , H04B10/2507 , H04B10/27 , H04B10/29 , H04Q3/52
摘要： PURPOSE:To obtain a device which is low-cost and small-sized and is superior in workability even if a signal has a wide band, by distributing a signal converted to light with respect to signal distribution in the device. CONSTITUTION:A signal 2 is converted to an optical signal by an electrophoto conversion part 6, and the optical signal is propagated in an optical fiber 7 and is made incident on an optical star coupler 8 and is distributed to n-number of optical signals. Distributed optical signals are propagated in optical fibers 9-1-9-n and are inputted to photoelectric conversion parts 10-1-10-n and are outputted as signals 4-1-4-n whose number is a desired distribution number. Since the optical star coupler fulfills the signal distributing function independent ly of the band width of the signal inputted to the device, a low-cost signal distributing part is attained even if the signal to be distributed has a wide band. Since an optical fiber cable narrower and lighter than a metallic cable is used for wiring, the space occupied by wiring in the device is reduced.

36. 发明专利

JPS6152042A Semiconductor laser driver 失效
标题翻译：半导体激光驱动器
公开(公告)号：JPS6152042A
公开(公告)日：1986-03-14
申请号：JP17326484
申请日：1984-08-22
申请人： Hitachi Ltd
发明人： HORI AKIHIRO , IMOTO KATSUYUKI , TAKASE MASAHIKO
IPC分类号： H04B10/00 , H01S3/10 , H01S5/0683 , H04B10/07 , H04B10/293 , H04B10/524 , H04B10/564 , H04B10/572
CPC分类号： H04B10/50 , H01S5/06835
摘要： PURPOSE:To obtain a prescribed extinction ratio and a peak value by detecting an optical output only when a pulse exists, controlling an LD drive circuit so as to make the output constant and controlling the LD current with the optical output at optical pulse output. CONSTITUTION:A light irradiated from a semiconductor laser LD1 is monitored by a photodetector (PD) 2 and its output is amplified by an amplifier 3. The output of the amplifier 3 is inputted to a sample-and-hold IC6. A sample-and- hold circuit 6 uses a signal 7 as a clock pulse and samples and holds the output of the amplifier 3 when the signal pulse exists. The output of the sample-and- hold circuit 6 controls the LD driver 4. As a result, the optical output with stable extinction ratio is obtained.
摘要翻译：目的：仅在存在脉冲时检测光输出才能获得规定的消光比和峰值，控制LD驱动电路，使输出恒定，并以光脉冲输出为光输出控制LD电流。构成：由半导体激光器LD1照射的光由光电检测器（PD）2监视，其输出由放大器3放大。放大器3的输出被输入到采样保持IC6。采样保持电路6使用信号7作为时钟脉冲，并且当信号脉冲存在时采样并保持放大器3的输出。采样保持电路6的输出控制LD驱动器4.结果，获得具有稳定消光比的光输出。

37. 发明专利

JP2005025482A Presence system 审中-公开
标题翻译：存在系统
公开(公告)号：JP2005025482A
公开(公告)日：2005-01-27
申请号：JP2003189953
申请日：2003-07-02
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： EI NAMI , TAKASE MASAHIKO , HOSHINO KAZUYOSHI , MOCHIZUKI MISATO
IPC分类号： G06F13/00
摘要： PROBLEM TO BE SOLVED: To provide a presence system that can provide conjecture on presence information even when presence information about a reference-requested user is unknown.
SOLUTION: A presence server 14 comprises a means for, when a request for presence information is received from a terminal 13, requesting a schedule server 15 to refer to schedule information based on the request and accumulated presence information, a means for receiving the schedule information from the schedule server, and a means for converting the received schedule information to a format of presence information and sending it to the requesting terminal.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供即使在关于参考请求的用户的存在信息是未知的情况下也可以提供存在信息的猜想的存在系统。存在服务器14包括用于当从终端13接收到对存在信息的请求时，基于该请求和累积存在信息请求调度服务器15参考调度信息的装置，用于接收来自时间表服务器的日程表信息，以及用于将接收到的日程表信息转换为呈现信息的格式并将其发送到请求终端的装置。版权所有（C）2005，JPO＆NCIPI

38. 发明专利

JP2002261812A ATM COMMUNICATION DEVICE 审中-公开
公开(公告)号：JP2002261812A
公开(公告)日：2002-09-13
申请号：JP2002020879
申请日：2002-01-30
申请人： HITACHI LTD
发明人： OGASAWARA NOBUO , ENDO NOBORU , MIKI KAZUHO , TAKASE MASAHIKO
IPC分类号： H04L12/813 , H04L12/823 , H04L12/833 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To provide an ATM communication device equipped with a function for quickly executing policing whose processing item or number is different for each communication service in a simple constitution for transmitting and receiving cells through a communication network in an asynchronous transfer mode. SOLUTION: The ATM communication device is provided with an interface means for transmitting and receiving cells through a network in an asynchronous transfer mode, a monitor means equipped with a plurality of monitor circuits for monitoring the traffic of the input cells for each item in parallel, and a determining means equipped with a plurality of determining circuits corresponding to the monitor circuits. In this system, the determining means judges whether the cells received by the interface means should be tagged or abandoned or inputted based on the plurality of monitored results outputted by the monitor means, the information related with the traffic included in the input cells, and a cell processing regulation decided corresponding to a communication service provided by the network. Thus, it is possible to reduce the cell delay of the communication network by this ATM communication device for quickly executing policing whose processing item or number is different for each communication service in a simple constitution.

39. 发明专利

JPH11317742A ATM SWITCH AND CONTROL METHOD THEREFOR 失效
公开(公告)号：JPH11317742A
公开(公告)日：1999-11-16
申请号：JP2965399
申请日：1999-02-08
申请人： HITACHI LTD
发明人： YANAGI JUNICHIRO , TAKASE MASAHIKO , OZAKI NAOHIKO , GOHARA SHINOBU
IPC分类号： H04L12/28
摘要： PROBLEM TO BE SOLVED: To reduce a memory quantity required for band control by sorting cells into virtual path or virtual channel for every outputting line, connecting the cell to a list structure corresponding to the virtual path or vertual channel, and hourly designating the virtual path or virtual channel to be output to each output line thereby reading the cell. SOLUTION: An address to store a cell is stored in a free address stored in a free address buffer 3. At the same time, routing information RTG showing each cell output line is sent to a buffer control part 2 from a buffer part 1. RTG is decoded by a routing decoder 21 to designate chain writing address tables (WR CH Table) 22-1 to 22-36 corresponding to the output line of an incoming cell. An address finally storing the cell is kept for every VPI in these WR CH Tables 22-1 to 22-36.

40. 发明专利

JPH10271135A EXCHANGE NODE 失效
公开(公告)号：JPH10271135A
公开(公告)日：1998-10-09
申请号：JP9031897
申请日：1997-03-24
申请人： HITACHI LTD
发明人： YOSHIMOTO TETSUO , MIKI KAZUHO , TAKASE MASAHIKO
IPC分类号： H04Q3/00 , H04L12/28 , H04L12/66 , H04L12/701 , H04L12/721 , H04L12/801 , H04L12/911 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To prevent the omission of packet caused by the change of virtual transfer route by reducing the processing load of the switch part by decreasing the number of times to change the virtual transfer route. SOLUTION: Even when it is judged that a virtual use transfer route change request is to be outputted by a packet processing part inside a present node, an exchange node 2 does not immediately sends out a new virtual transfer route change request to a switch part 24 but waits for the arrival of the virtual use transfer route change request from a node 18B at the transfer destination of data packet for a fixed time. When the change request arrives, the setting request of the new virtual transfer route for connecting a node 1A at the transfer source of data packet and the node 1B without through a protocol processing part 213 is sent out to the switch part 24.

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