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    • 1. 发明授权
    • Memory system handling a plurality of bits as a unit to be processed
    • 处理作为要处理的单元的多个位的存储器系统
    • US4434502A
    • 1984-02-28
    • US250784
    • 1981-04-03
    • Takeshi ArakawaHiroki Ikeda
    • Takeshi ArakawaHiroki Ikeda
    • G06F12/02G06F15/20
    • G06F12/0207
    • A memory system for simultaneously extracting a desired block of data in response to an address specifying only the center bit of the block. The input address is modified through an arithmetic circuit wherein the address representing the center bit is added to and subtracted from to produce a plurality of addresses which are used to address a plurality of separate memory blocks. The outputs from the memory blocks are passed through a selection alignment matrix circuit which selects from the outputs of the memory blocks only those bits in the desired block of data and aligns those bits in a predetermined array. Bits other than those in the desired block of data are discarded.
    • 一种用于响应于仅指定块的中心位的地址同时提取所需数据块的存储器系统。 输入地址通过算术电路进行修改,其中表示中心位的地址被加到并被减去以产生用于寻址多个单独的存储块的多个地址。 来自存储器块的输出通过选择对准矩阵电路,其从存储器块的输出仅选择所需数据块中的那些位,并将这些位对齐在预定的阵列中。 除了期望的数据块之外的位被丢弃。
    • 3. 发明授权
    • Transimpedance amplifier and PON system
    • 互阻放大器和PON系统
    • US08653433B2
    • 2014-02-18
    • US13145047
    • 2010-01-13
    • Daisuke MashimoHiroki IkedaYoshinobu Morita
    • Daisuke MashimoHiroki IkedaYoshinobu Morita
    • H03G3/20
    • H03F3/087H03F1/083H03G3/3084H04B10/272H04B10/6931
    • In a gain-switching-type transimpedance amplifier, in order to provide a technique capable of preventing unnecessary gain switching caused when noise is received, and preventing decrease in sensitivity caused when noise with a large input level is received, and then, a burst signal with a small input level is received, a transimpedance amplifier 5 includes: a pre-amplifier 200 to which the burst signal is inputted; an average detection start determination unit 300 for comparing an output of a pre-amplifier 200 with a first threshold voltage; an average detection circuit 400 for detecting and outputting an average value of the output of the pre-amplifier 200 during a certain period of time from a time point when the output of the pre-amplifier 200 exceeds the first threshold voltage; and a gain switching control unit 500 for determining whether to switch a gain of the pre-amplifier 200 based on an output of the average detection circuit 400.
    • 在增益切换式跨阻放大器中,为了提供能够防止在接收到噪声时引起的不必要的增益切换的技术,并且防止在接收到具有大输入电平的噪声时引起的灵敏度降低,然后,突发信号 在接收到小的输入电平的情况下,跨阻抗放大器5包括:输入突发信号的前置放大器200; 平均检测开始判定单元300,用于将前置放大器200的输出与第一阈值电压进行比较; 平均检测电路400,用于在从前置放大器200的输出超过第一阈值电压的时间点起,在一定时间段内检测并输出前置放大器200的输出的平均值; 以及用于基于平均检测电路400的输出来确定是否切换前置放大器200的增益的增益切换控制单元500。
    • 5. 发明授权
    • Optical access system and optical line terminal
    • 光接入系统和光线路终端
    • US08380065B2
    • 2013-02-19
    • US12582083
    • 2009-10-20
    • Michitaka OkunoKoji WakayamaKenichi SakamotoHiroki Ikeda
    • Michitaka OkunoKoji WakayamaKenichi SakamotoHiroki Ikeda
    • H04J14/00
    • H04Q11/0067H04J2203/0058H04L43/0864H04Q2011/0079H04Q2011/0088
    • Provided is an optical access system comprising: an optical line terminal connected to another network; a plurality of optical network units, each connected to a user terminal; and at least one of an optical switching unit and an optical splitter, which is installed between the optical line terminal and the plurality of optical network units. The optical line terminal allocates a length of time to a discovery phase for detecting the plurality of optical network units, and a length of time to data transmission phases for transferring data from the plurality of optical network units; and changes a ratio of the length of time of the discovery phase to the length of time of the data transmission phases so that the length of time of the discovery phase is shortened in the case where a number of the optical network units that are registered in the optical line terminal increase.
    • 提供一种光接入系统,包括:连接到另一网络的光线路终端; 多个光网络单元,各自连接到用户终端; 以及安装在光线路终端与多个光网络单元之间的光交换单元和分光器中的至少一个。 光线路终端将用于检测多个光网络单元的发现阶段的时间长度分配给从多个光网络单元传送数据的数据传输阶段的时间长度; 并且将发现阶段的时间长度与数据传输阶段的时间长度的比率进行改变,使得在注册的光网络单元的数量的情况下,发现阶段的时间长度被缩短 光线路终端增加。
    • 9. 发明授权
    • PON system method for receiving optical signal and OLT
    • PON系统接收光信号和OLT的方法
    • US08116627B2
    • 2012-02-14
    • US12222224
    • 2008-08-05
    • Hiroki IkedaToshiki SugawaraYusuke Yajima
    • Hiroki IkedaToshiki SugawaraYusuke Yajima
    • H04B10/20
    • H04B10/272H04B10/27
    • When a signal of weak optical power is received immediately after a signal of intense optical power, input of the signal of intense optical power readily causes saturation, and the influence interferes in the signal of weak optical power to deteriorate receiver sensitivity. Moreover, when a reverse-bias voltage of APD is changed, if a difference between the voltages is large, a next optical signal is received until the receiver sensitivity of the APD becomes stable, so that receiver sensitivity deteriorates. A DBA order is determined so that a difference in reverse-bias voltage is small, and reverse-bias voltage is controlled in line with reception timing from ONU.
    • 当在强光信号之后立即接收到弱光功率的信号时,强光信号信号的输入容易引起饱和,并且影响会干扰弱光功率的信号,从而降低接收机灵敏度。 此外,当APD的反向偏置电压发生变化时,如果电压差大,则接收下一个光信号,直到APD的接收灵敏度变得稳定为止,接收灵敏度变差。 确定DBA顺序,使得反向偏置电压的差小,并且根据ONU的接收定时来控制反向偏置电压。