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    • 3. 发明授权
    • Broadcasting receiver and method of receiving a broadcasting wave
    • 广播接收机和接收广播波的方法
    • US07672654B2
    • 2010-03-02
    • US11453211
    • 2006-06-14
    • Kunio Okada
    • Kunio Okada
    • H04B1/06
    • H04B1/28H03G3/3068H04H40/18H04N5/52
    • A receiver has an amplifier for amplifying a TV broadcast signal. A mixer mixes the amplified signal with an oscillation signal corresponding to a channel selection signal and generates a low frequency signal. A bandpass filter generates a signal having an amplitude corresponding to the low frequency signal. Electric field intensity filtering circuits filter the low frequency signal. A subtractor calculates a difference between the output from the filtering circuits and the output from the bandpass filter to generate a difference signal which is negatively fed back signal to the amplifier when an amplitude of the difference signal is larger than a predetermined value. The signal from the filtering circuit is the negative feed back signal when the amplitude of the difference signal is not larger than the predetermined value. An AGC signal corresponding to an electric field intensity of the output from the mixer is inputted to the amplifier.
    • 接收机具有用于放大TV广播信号的放大器。 混频器将放大的信号与对应于信道选择信号的振荡信号进行混频,并产生低频信号。 带通滤波器产生具有对应于低频信号的振幅的信号。 电场强度滤波电路对低频信号进行滤波。 减法器计算滤波电路的输出与带通滤波器的输出之间的差值,以产生当差分信号的幅度大于预定值时向放大器产生负反馈信号的差分信号。 当差分信号的振幅不大于预定值时,来自滤波电路的信号是负反馈信号。 对应于来自混频器的输出的电场强度的AGC信号被输入到放大器。
    • 4. 发明授权
    • Orthogonal frequency division multiplexing (OFDM) receiver, OFDM receiving circuit and OFDM diversity reception method
    • 正交频分复用(OFDM)接收机,OFDM接收电路和OFDM分集接收方法
    • US07424073B2
    • 2008-09-09
    • US10973860
    • 2004-10-26
    • Kunio Okada
    • Kunio Okada
    • H04B7/10H04L1/02H04L27/00
    • H04L25/0232H04L1/06H04L27/2647
    • An Orthogonal Frequency Division Multiplexing (OFDM) signal having a symbol defining a transmission unit is produced by dividing data streams into a plurality of carriers within a predetermined bandwidth and prepared with orthogonal modulation. A transform unit having at least two systems transforms the received OFDM signal to a carrier domain signal per symbol unit. A composite circuit segments the carrier units and adaptively composites the signal data which constitutes a plurality of different carriers transformed by a first system transform circuit and the signal data which constitutes a plurality of different carriers transformed by a second system transform circuit for each identical carrier in each system.
    • 通过将数据流划分成预定带宽内的多个载波并通过正交调制来制作具有定义传输单元的符号的正交频分复用(OFDM)信号。 具有至少两个系统的变换单元将接收到的OFDM信号变换为每符号单位的载波域信号。 复合电路对载波单元进行分段,并自适应地组合构成由第一系统变换电路变换的多个不同载波的信号数据和构成由第二系统变换电路为每个相同载波变换的多个不同载波的信号数据 每个系统。
    • 5. 发明申请
    • OFDM signal demodulator circuit and OFDM signal demodulating method
    • OFDM信号解调电路和OFDM信号解调方法
    • US20060023800A1
    • 2006-02-02
    • US11181239
    • 2005-07-14
    • Kunio Okada
    • Kunio Okada
    • H04K1/10H04J11/00
    • H04L27/2647
    • When an OFDM demodulator circuit performs the waveform equivalence of carrier signals outputted from an FFT processing circuit, the OFDM demodulator circuit extracts correction coefficients corresponding to the gain of a reception signal outputted from a tuner unit from a correction coefficient table, and phase corrections are performed in a phase correction circuit based on the extracted correction coefficients. After that, the OFDM demodulator circuit performs the waveform equivalence processing with a transmission path equivalent circuit. Thereby, even if a C/N value is deteriorated owing to the amplification of an OFDM signal, the influence on the receiving performance of a receiving apparatus can be curbed, and a receiving performance can be improved.
    • 当OFDM解调器电路执行从FFT处理电路输出的载波信号的波形等价时,OFDM解调器电路从校正系数表中提取与从调谐器单元输出的接收信号的增益相对应的校正系数,并执行相位校正 在基于提取的校正系数的相位校正电路中。 之后,OFDM解调器电路利用传输路径等效电路进行波形等价处理。 因此,即使由于OFDM信号的放大而使C / N值劣化,也可以抑制对接收装置的接收性能的影响,可以提高接收性能。
    • 8. 发明申请
    • Position detecting apparatus and method of detecting a position
    • 位置检测装置和位置检测方法
    • US20070219719A1
    • 2007-09-20
    • US11803321
    • 2007-05-14
    • Kunio OkadaShimpei Matsuda
    • Kunio OkadaShimpei Matsuda
    • G01C21/00
    • G01S19/24G01S19/34
    • CPU instructs RF controlling section to switch RF section from an inoperative mode to an operation mode and from the operation mode to the inoperative mode. When all of five pieces of sub-frame data have not been acquired, RF section is switched intermittently from the inoperative mode to the operation mode in synchronization with transmission of lacking sub-frame data, thereby acquiring such lacking sub-frame data. When all the five pieces of sub-frame data have been acquired, the current position is calculated using positional information contained in the sub-frame data. A part of five pieces of sub-frame data including the first to fifth sub-frame data transmitted from a satellite in a time series manner is acquired from GPS signal received in the operation mode, and the remaining part of the five pieces of sub-frame data is acquired in operation mode set at other timing, and then the positional information is judged based on the five pieces of sub-frame data acquired in the above manner.
    • CPU指示RF控制部分将RF部分从不工作模式切换到操作模式,并从操作模式切换到不工作模式。 当没有获取五个子帧数据的全部时,与缺少子帧数据的传输同步地,将RF部分从不工作模式间歇地切换到操作模式,从而获取这种缺少的子帧数据。 当已经获取了所有五条子帧数据时,使用包含在子帧数据中的位置信息来计算当前位置。 从操作模式中接收的GPS信号中获取包括以时间序列方式从卫星发送的第一至第五子帧数据的五个子帧数据的一部分,并且五个子帧的剩余部分 在其他定时设定的操作模式中获取帧数据,然后基于以上述方式获取的5条子帧数据来判断位置信息。