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    • 81. 发明授权
    • OFDM demodulator
    • OFDM解调器
    • US07289765B2
    • 2007-10-30
    • US10505793
    • 2003-12-18
    • Takahiro OkadaTamotsu Ikeda
    • Takahiro OkadaTamotsu Ikeda
    • H04Q7/00
    • H04L27/2657H04L27/2605H04L27/2662H04L27/2676H04L2027/0036
    • An OFDM demodulator includes an FFT circuit, a phase correction circuit, and a timing synchronization circuit. The timing synchronization circuit includes a symbol-boundary calculation circuit to estimate a symbol-boundary position Nx by filtering the correlation peak of a guard interval, symbol-boundary correction circuit to calculate a clock-phase error based on the symbol-boundary position Nx, and a start-flag generation circuit to generate a start flag for the FFT calculation. The symbol-boundary correction circuit subtracts only a value whose precision is smaller than the cycle of a reference clock from the symbol-boundary position Nx, and generates a phase correction signal for each sub-carrier based on the value. The phase correction circuit performs a complex multiplication of the FFF-calculated signal by the phase correction signal to correct the clock-phase error.
    • OFDM解调器包括FFT电路,相位校正电路和定时同步电路。 定时同步电路包括符号边界计算电路,用于通过对保护间隔的相关峰值进行滤波来估计符号边界位置Nx,符号边界校正电路用于基于符号边界位置Nx来计算时钟相位误差, 以及开始标志生成电路,用于生成用于FFT计算的开始标志。 符号边界校正电路仅从符号边界位置Nx仅减去精度小于参考时钟的周期的值,并且基于该值生成每个子载波的相位校正信号。 相位校正电路通过相位校正信号执行FFF计算的信号的复数乘法以校正时钟相位误差。
    • 82. 发明申请
    • Ofdm demodulation device
    • Ofdm解调装置
    • US20050163094A1
    • 2005-07-28
    • US10505793
    • 2003-12-18
    • Takahiro OkadaTamotsu Ikeda
    • Takahiro OkadaTamotsu Ikeda
    • H04J11/00H04J1/00H04L27/00H04L27/26
    • H04L27/2657H04L27/2605H04L27/2662H04L27/2676H04L2027/0036
    • An OFDM demodulator includes an FFT circuit, a phase correction circuit, and a timing synchronization circuit. The timing synchronization circuit includes a symbol-boundary calculation circuit to estimate a symbol-boundary position Nx by filtering the correlation peak of a guard interval, symbol-boundary correction circuit to calculate a clock-phase error based on the symbol-boundary position Nx, and a start-flag generation circuit to generate a start flag for the FFT calculation. The symbol-boundary correction circuit subtracts only a value whose precision is smaller than the cycle of a reference clock from the symbol-boundary position Nx, and generates a phase correction signal for each sub-carrier based on the value. The phase correction circuit performs a complex multiplication of the FFF-calculated signal by the phase correction signal to correct the clock-phase error.
    • OFDM解调器包括FFT电路,相位校正电路和定时同步电路。 定时同步电路包括符号边界计算电路,用于通过对保护间隔的相关峰值进行滤波来估计符号边界位置Nx,符号边界校正电路基于符号边界位置Nx来计算时钟相位误差, 以及开始标志生成电路,用于生成用于FFT计算的开始标志。 符号边界校正电路仅从符号边界位置Nx仅减去精度小于参考时钟的周期的值,并且基于该值生成每个子载波的相位校正信号。 相位校正电路通过相位校正信号执行FFF计算的信号的复数乘法以校正时钟相位误差。
    • 84. 发明授权
    • Optical semiconductor element package and manufacturing method thereof
    • 光半导体元件封装及其制造方法
    • US06440778B1
    • 2002-08-27
    • US09613633
    • 2000-07-11
    • Takahiro OkadaHideaki MurataMasato Sakata
    • Takahiro OkadaHideaki MurataMasato Sakata
    • H01L2144
    • H01L27/14618H01L2924/0002H01L2924/00
    • An optical semiconductor element package including a housing, electric signal input and output wiring boards, and external leads. The housing has a metal frame and a metal bottom plate, for storing optical semiconductor elements. The electric signal input and output wiring boards are arranged in the housing at positions so that the optical semiconductor elements are not existent right above and right below the boards. The external leads are drawn to the outside through the side wall of the metal frame. The wiring boards are connected to the external leads and to the optical semiconductor elements by bonding wires. The input and output of an electric signal between the outside and the optical semiconductor elements are carried out through the bonding wires, the wiring boards and the external leads.
    • 一种包括壳体,电信号输入和输出线路板以及外部引线的光学半导体元件封装。 壳体具有用于存储光学半导体元件的金属框架和金属底板。 电信号输入和输出线路板被布置在壳体中的位置,使得光学半导体元件不在板的正上方和右下方。 外部引线通过金属框架的侧壁被拉到外部。 接线板通过接合线连接到外部引线和光学半导体元件。 外部和光学半导体元件之间的电信号的输入和输出通过接合线,接线板和外部引线进行。
    • 86. 发明授权
    • Means and method of improving multiplexed transmission and reception by
coding and modulating divided digital signals
    • 通过对分割的数字信号进行编码和调制来提高多路传输和接收的方法和方法
    • US5903546A
    • 1999-05-11
    • US632411
    • 1996-07-18
    • Tamotsu IkedaYasunari IkedaTakahiro Okada
    • Tamotsu IkedaYasunari IkedaTakahiro Okada
    • H04L1/00H04L27/26H04L27/34H04N5/44H04N7/24H04N7/26H04J3/22
    • H04L27/2604H04L1/0003H04L1/0017H04L1/0054H04L1/006H04L1/0065H04L27/183H04L27/3488H04L5/0007H04L5/0042H04L5/0044H04N21/2383H04N21/4382H04L2001/0098H04N19/39H04N5/4401Y02B60/31
    • The present invention is used for example digital television broadcasting and provides a good television picture and sound where the signal level is large on the reception side and provides a television picture and sound of a certain degree of quality even in a case where the signal level is small. The signal transmitting apparatus (10) divides the series of input information in accordance with the significance of the content of the data to obtain a plurality of input signals, encodes the input signals with respectively different encoding rates, multiplexes the same at the time slots for transmission, modulates the same by multi-value modulation methods different for every time slot corresponding to the coded signals, and transmits the resultant data via the communication transmission line (20) such as a satellite communication channel to the signal receiving apparatus (30). The signal receiving apparatus (30) demodulates the respective coded signals from the modulated signals received from the communication transmission line (20) by demodulation methods different for every time slot corresponding to the coded signals contained in the received signals, demultiplexes the same, decodes the result, and reproduces the respective input signals.
    • PCT No.PCT / JP95 / 01736 Sec。 371日期:1996年7月18日 102(e)日期1996年7月18日PCT提交1995年8月31日PCT公布。 公开号WO96 / 07260 日期1996年3月7日本发明用于数字电视广播,并且在接收侧提供了良好的电视图像和声音信号电平较大,并且即使在情况下也提供一定质量的电视图像和声音 信号电平较小。 信号发送装置(10)根据数据的内容的重要性对输入信息的一系列进行划分以获得多个输入信号,以分别对不同的编码率对输入信号进行编码,在时隙多路复用 通过对与编码信号相对应的每个时隙不同的多值调制方式进行调制,并通过诸如卫星通信信道的通信传输线(20)将结果数据发送到信号接收装置(30)。 信号接收装置(30)通过与包含在接收信号中的编码信号相对应的每个时隙不同的解调方式,对从通信传输线(20)接收的调制信号中的各个编码信号进行解调,解复用 结果并再现相应的输入信号。