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    • 2. 发明申请
    • DISK DRIVE AND COMPUTER
    • 磁盘驱动器和计算机
    • WO1997038367A1
    • 1997-10-16
    • PCT/JP1997001204
    • 1997-04-09
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.HAGIWARA, MitsuoTAKAHASHI, HiromasaYAMATO, SatoshiSHIBASAKI, NobuoYOTSUTANI, MitsuoISHII, Tsutomu
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.
    • G06F09/06
    • G06F3/0614G06F3/0623G06F3/0632G06F3/0644G06F3/0658G06F3/0674G06F3/0676G06F3/0677G06F8/65G06F9/4401
    • A microcomputer (5) constituted in an integrated circuit including an electrically erasable programmable nonvolatile memory (56) and a central processing unit (51) is adopted for controlling a disk drive (2). The memory (56) stores an application program, such as a recorded information reproduction control program in an application program area (561) and a reboot program which is utilized to update the application program in a reboot program area (560). The processor (51) rewrites all or part of the application program by executing the reboot program according to an application program rewriting command supplied from the outisde. Therefore, all or part of the application program stored in the memory (56) can be rewritten even after the microcomputer (5) is mounted on a disk drive. Since the reboot program area is not rewritten, the reprogram of the application program area is restarted immediately after the reboot program is executed again even when the reprogramming of the nonvolatile memory is interrupted due to abnormality.
    • 采用包括电可擦除可编程非易失性存储器(56)和中央处理单元(51)的集成电路中的微计算机(5)来控制磁盘驱动器(2)。 存储器(56)将诸如记录信息再现控制程序之类的应用程序存储在应用程序区域(561)中,并且重新启动程序用于在重新启动程序区域(560)中更新应用程序。 处理器(51)通过根据从outisde提供的应用程序重写命令执行重新启动程序来重写应用程序的全部或部分。 因此,即使在微型计算机(5)安装在磁盘驱动器上之后,也可以重写存储在存储器(56)中的应用程序的全部或一部分。 由于重新启动程序区域不被重写,所以即使非易失性存储器的重新编程由于异常而被中断,也会立即重新启动应用程序区域的重新编程。
    • 6. 发明申请
    • METHOD FOR GENERATING DRIVE CONTROL DATA
    • 用于产生驱动控制数据的方法
    • WO1998056089A1
    • 1998-12-10
    • PCT/JP1997001920
    • 1997-06-06
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.HANAWA, HiroakiHANEDA, Makoto
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.
    • H01S03/18
    • H01S5/0683H01S5/0617H01S5/06832
    • A host device (32) generates LD driving information for the full range of desired operating temperatures by mathematical approximation from the LD driving information threshold current Ith and modulated current Imod at two to three temperature points supplied from the LD manufacturer, thereafter actually operates a transmitter (1T) at a room temperature and acquires the then LD driving information. Then the device (32) compares the acquired actual driving information with the driving information obtained by approximate expressions at the same temperature point and obtains drive control data by correcting the driving information in the full temperature range obtained by the approximate expressions based on the difference between both information. The data calculated using the approximation expressions are corrected by using correction coefficients acquired based on the driving current measured at a specific temperature. Therefore, it is unnecessary to measure the driving current in the full range of temperature, and driving control data which are the most suitable for the actual use of the optical transmitter, namely, which conforms to the characteristics of the optical transmitter and laser diode can be obtained efficiently.
    • 主机装置(32)通过从LD驱动信息阈值电流Ith的数学近似和从LD制造商提供的两到三个温度点的调制电流Imod,产生用于所需操作温度的全范围的LD驱动信息,然后实际操作发送器 (1T),并获取该LD驱动信息。 然后,装置(32)将所获取的实际驾驶信息与在相同温度点处通过近似表达式获得的驾驶信息进行比较,并通过基于近似表达式获得的全温度范围内的驾驶信息,通过基于 两个信息。 使用近似表达式计算的数据通过使用基于在特定温度下测量的驱动电流获取的校正系数来校正。 因此,不需要在整个温度范围内测量驱动电流,并且适合于实际使用光发射机的驱动控制数据,即符合光发射机和激光二极管的特性的驱动控制数据 有效地获得。
    • 8. 发明申请
    • OPTICAL TRANSMISSION MODULE AND OPTICAL TRANSMISSION SYSTEM
    • 光传输模块和光传输系统
    • WO1998013959A1
    • 1998-04-02
    • PCT/JP1996002818
    • 1996-09-27
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.HANAWA, HiroakiHANEDA, Makoto
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.
    • H04B10/20
    • H04B10/272
    • Let the received level of reference light of an optical transmission module (1, 1A) included in an optical transmission system be m, the transmitted level thereof be n, and the attenuation factor of the light signal fed from a subscriber line station unit (SLT) and received by a subscriber line network unit (ONU) (#1) be alpha (= received level/n). Then the optical output level of the subscriber line network unit (ONU) (#1) is mx1/ alpha . Thus the ONU (#1) outputs the light signal of an output level which is the product of the input and the inverse number of the attenuation factor to the SLT, and hence the SLT receives the signal at the reference light received level m from any of the ONUs. Therefore, the gain control of the circuit which amplifies the received levels of a plurality of kinds of light signals having suffered different line losses and the resetting of the threshold voltage for detecting the logical value of the received signal are simplified or the circuits for controlling the gain and resetting the threshold voltage are eliminated.
    • 使包含在光传输系统中的光传输模块(1,1A)的参考光的接收电平为m,其发射电平为n,并且从用户线路站单元(SLT)馈送的光信号的衰减因子 )并且由用户线路网络单元(ONU)(#1)接收为α(=接收电平/ n)。 那么用户线路网络单元(ONU)(#1)的光输出电平为mx1 / alpha。 因此,ONU(#1)将作为衰减因子的乘积和倒数的乘积的输出电平的光信号输出到SLT,并且因此SLT以从参考光接收电平m的任何值接收信号 的ONU。 因此,放大了已经遭受不同线路损耗的多种光信号的接收电平的放大电路的增益控制和用于检测接收信号的逻辑值的阈值电压的复位被简化,或用于控制 消除了增益和复位阈值电压。
    • 9. 发明申请
    • PLL CIRCUIT AND PICTURE REPRODUCING DEVICE
    • PLL电路和图像再现设备
    • WO1997007594A1
    • 1997-02-27
    • PCT/JP1996002190
    • 1996-08-05
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.TAKAHASHI, FumihiroNACHI, ShikikoYAMAMOTO, NorihisaFURIHATA, Makoto
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.
    • H03L07/08
    • H03L7/0893H03L7/087H03L7/0891H03L7/091H03L7/14H03L7/148H03L7/191H04N5/44504
    • A digital first phase comparator (22) and a sampling type second phase comparator (32) are provided in parallel. The output current Iout2 of the comparator (32) is inputted to a voltage-controlled oscillator (14) when the phase is close to a locked phase. In the other phase, the output current Iout1 of the comparator (22) is inputted to the oscillator (14). When part of a reference signal fs is lost, a complementing circuit (50) complements at least the reference signal fs inputted to the comparator (22) by pulses. A noise detecting and removing circuit (60) detects and removes the noise of the signal fs and inputs the signals fs to the comparators (22 and 32). The circuit (60) stops the operation of the comparators (22 and 32) for a prescribed period of time after detecting the noise. Therefore, the operation of a PLL circuit is stabilized and characters can be displayed sharply on a screen even when the horizontal synchronizing signal of video signals contains noise or part of the signal is lost.
    • 平行地提供数字第一相位比较器(22)和采样型第二相位比较器(32)。 当相位接近锁定相位时,比较器(32)的输出电流Iout2被输入到压控振荡器(14)。 在另一相位中,比较器(22)的输出电流Iout1输入到振荡器(14)。 当参考信号fs的一部分丢失时,补充电路(50)至少补充了通过脉冲输入到比较器(22)的参考信号fs。 噪声检测和去除电路(60)检测和去除信号fs的噪声,并将信号fs输入到比较器(22和32)。 在检测到噪声之后,电路(60)停止比较器(22和32)的操作一段规定的时间。 因此,即使当视频信号的水平同步信号包含噪声或部分信号丢失时,PLL电路的操作也能稳定地显示在屏幕上的字符。
    • 10. 发明申请
    • OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION SYSTEM
    • 光学发射器和光传输系统
    • WO1998018222A1
    • 1998-04-30
    • PCT/JP1996003022
    • 1996-10-18
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.HITACHI COMMUNICATION SYSTEMS, INC.HANEDA, MakotoHANAWA, HiroakiHARASAWA, KatsuyoshiYAMAHARA, Kenji
    • HITACHI, LTD.HITACHI MICROCOMPUTER SYSTEM, LTD.HITACHI COMMUNICATION SYSTEMS, INC.
    • H04B10/14
    • H04B10/25
    • In an optical transmission system using a point-multipoint transmission system, a controller for controlling the drive of an LD is provided in an optical transmitter installed in a subscriber's house; by means of the controller, the LD of the optical transmitter is usually set in a zero-bias state or in a reversely biased state; an on-hook signal sent from a telephone set or a computer connected to the optical transmitter when the telephone set or the computer is in an on-hook operation by the user is detected; and a forward bias current is made to flow through the LD based on the on-hook signal. Since the LD of the optical transmitter installed in the subscriber's house is set in a reversely biased or in a zero-bias state when it is in an on-hook operation, the spontaneous emission components disappear from the LD of the optical transmitter. In addition, since a modulated current based on the data signal to be transmitted while the forward bias current flows through the LD is given to the LD, optical signals are outputted from the LD without light emission delay. Moreover, since the transmission and reception of the optical signals are made through the same optical fiber and the optical signals are transmitted by adjusting the output level by the amount corresponding to the attenuation of received signals caused by transmission loss, the received levels of optical signals from each subscriber's house at the subscriber's terminal station are uniform.
    • 在使用点对多点传输系统的光传输系统中,在安装在用户住宅内的光发射机中设置用于控制LD的驱动的控制器; 通过控制器,光发射机的LD通常设置为零偏置状态或反向偏置状态; 检测到当电话机或计算机处于用户的挂机操作时从电话机或连接到光发射机的计算机发送的挂机信号; 并且基于挂机信号使正向偏置电流流过LD。 由于安装在用户住宅中的光发射机的LD在处于挂机操作时被设置为反向偏置或零偏置状态,所以自发发射成分从光发射机的LD消失。 此外,由于在向前偏置电流流过LD的情况下基于要发送的数据信号的调制电流被提供给LD,所以从LD输出光信号而没有发光延迟。 此外,由于通过相同的光纤进行光信号的发送和接收,并且通过将输出电平调整为与由传输损耗引起的接收信号的衰减相对应的量来传输光信号,所接收的光信号电平 来自用户终端的每个用户的房屋是统一的。