Optical transmission apparatus
    22.
    发明授权
    Optical transmission apparatus 有权
    光传输装置

    公开(公告)号:US07139117B2

    公开(公告)日:2006-11-21

    申请号:US10793099

    申请日:2004-03-05

    IPC分类号: H01S4/00 H04B10/12

    CPC分类号: H04B10/2942 H04B10/2916

    摘要: An optical transmission apparatus that improves optical transmission quality by performing an optical noise correction and optical level detection with great precision. A first optical amplifier performs optical amplification with an optical fiber transmission line as an amplification medium. A second optical amplifier inputs second excitation light into an amplification medium in which an active substance for optical amplification is doped to perform optical amplification. A first optical level detector monitors, before transmitting an optical signal, a level of optical noise scattered by the first optical amplifier by emitting first excitation light in an operating environment and detects an optical level at the time of transmitting the optical signal by subtracting the level of the optical noise from a signal amplified by the first optical amplifier. A second optical level detector monitors, before transmitting an optical signal, a level of optical noise emitted from the second optical amplifier by emitting the second excitation light in the operating environment and detects an optical level at the time of transmitting the optical signal by subtracting the level of the optical noise from a signal amplified by the second optical amplifier.

    摘要翻译: 一种通过以高精度执行光学噪声校正和光学水平检测来提高光传输质量的光传输装置。 第一光放大器利用光纤传输线作为放大介质进行光放大。 第二光放大器将第二激发光输入到其中掺杂用于光放大的活性物质进行光放大的放大介质中。 第一光学电平检测器在发送光信号之前,通过在操作环境中发射第一激发光来监测由第一光放大器散射的光噪声水平,并且通过减去光信号的发送时检测光电平 的来自由第一光放大器放大的信号的光噪声。 第二光学电平检测器在发送光信号之前通过在操作环境中发射第二激发光来监测从第二光放大器发射的光噪声水平,并通过减去光信号的发送来检测光电平 来自由第二光放大器放大的信号的光噪声的电平。

    Method of canceling noise contained in received signal
    26.
    发明授权
    Method of canceling noise contained in received signal 失效
    消除接收信号中包含的噪声的方法

    公开(公告)号:US08412140B2

    公开(公告)日:2013-04-02

    申请号:US12950477

    申请日:2010-11-19

    申请人: Makoto Murakami

    发明人: Makoto Murakami

    IPC分类号: H04B1/10 H04B17/00

    CPC分类号: H04B1/28 H04B1/0007

    摘要: A multiplication section multiplies a signal output from a GPS antenna by a local oscillation signal generated by a local oscillation signal generation section to down-convert the signal output from the GPS antenna into an intermediate-frequency signal. A sampling circuit section samples a generated signal generated by a portable electronic circuit using a sampling clock signal having a frequency lower than a frequency of the generated signal. An attenuation section generates a cancellation signal by attenuating the sampled signal, and an addition section adds the cancellation signal to the signal output from the multiplication section to cancel in-band noise superimposed on the received signal.

    摘要翻译: 乘法部分将由GPS天线输出的信号乘以由本地振荡信号产生部分产生的本地振荡信号,以将从GPS天线输出的信号下变频为中频信号。 采样电路部分使用具有低于所产生的信号的频率的频率的采样时钟信号来对由便携式电子电路产生的生成信号进行采样。 衰减部通过衰减采样信号来产生消除信号,并且加法部分将抵消信号与从乘法部分输出的信号相加以消除叠加在接收信号上的带内噪声。

    Method of canceling noise contained in received signal
    27.
    发明授权
    Method of canceling noise contained in received signal 有权
    消除接收信号中包含的噪声的方法

    公开(公告)号:US07860475B2

    公开(公告)日:2010-12-28

    申请号:US11959088

    申请日:2007-12-18

    申请人: Makoto Murakami

    发明人: Makoto Murakami

    IPC分类号: H04B1/10 H04B17/00

    CPC分类号: H04B1/28 H04B1/0007

    摘要: A multiplication section multiplies a signal output from a GPS antenna by a local oscillation signal generated by a local oscillation signal generation section to down-convert the signal output from the GPS antenna into an intermediate-frequency signal. A sampling circuit section samples a generated signal generated by a portable electronic circuit using a sampling clock signal having a frequency lower than a frequency of the generated signal. An attenuation section generates a cancellation signal by attenuating the sampled signal, and an addition section adds the cancellation signal to the signal output from the multiplication section to cancel in-band noise superimposed on the received signal.

    摘要翻译: 乘法部分将由GPS天线输出的信号乘以由本地振荡信号产生部分产生的本地振荡信号,以将从GPS天线输出的信号下变频为中频信号。 采样电路部分使用具有低于所产生的信号的频率的频率的采样时钟信号来对由便携式电子电路产生的生成信号进行采样。 衰减部通过衰减采样信号来产生消除信号,并且加法部分将抵消信号与从乘法部分输出的信号相加以消除叠加在接收信号上的带内噪声。

    Positioning signal reception device and control method of positioning signal reception device
    29.
    发明授权
    Positioning signal reception device and control method of positioning signal reception device 有权
    定位信号接收装置及定位信号接收装置的控制方法

    公开(公告)号:US07620132B2

    公开(公告)日:2009-11-17

    申请号:US11295513

    申请日:2005-12-07

    申请人: Makoto Murakami

    发明人: Makoto Murakami

    IPC分类号: H04B1/10

    摘要: A positioning signal reception device receives a positioning signal transmitted from a position information satellite, and includes: a signal reception portion that obtains a reception signal by receiving the positioning signal; an A/D conversion portion that generates a digital signal by converting the reception signal into a digital form; a filter portion that subjects the digital signal to frequency separation, a characteristic of the filter portion being changeable; a filter characteristic change portion that changes the characteristic of the filter portion according to an operating state of the positioning signal reception device and an external environmental condition of the positioning signal reception device; and a code synchronization establishment portion that establishes synchronization of spreading codes contained in the reception signal.

    摘要翻译: 定位信号接收装置接收从位置信息卫星发送的定位信号,包括:信号接收部,其通过接收定位信号来取得接收信号; A / D转换部分,通过将接收信号转换成数字形式产生数字信号; 使数字信号进行频率分离的滤波器部分,滤波器部分的特性是可变的; 滤波器特性变化部,其根据定位信号接收装置的动作状态和定位信号接收装置的外部环境状况改变滤波部的特性; 以及代码同步建立部,其建立包含在接收信号中的扩展码的同步。