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    • 61. 发明授权
    • Line signal deterioration removing systems
    • 线信号去除系统
    • US5189684A
    • 1993-02-23
    • US582207
    • 1990-10-02
    • Takashi KakuHiroki KishimotoKyoko Hirao
    • Takashi KakuHiroki KishimotoKyoko Hirao
    • H04L1/20H04L27/00H04L27/233
    • H04L27/2332H04L1/205H04L2027/003H04L2027/0057
    • A system for removing line deterioration elements such as intersymbol interference, carrier frequency offset and phase jitter, etc. from the receiving signal. An automatic equalizing unit compensates for signal deterioration by intersymbol interference. Next, a carrier phase control unit compensates for signal deterioration by carrier frequency offset. Thereafter, a phase jitter interference removing units allows increase of only phase jitter element by utilizing line characteristic to easily extract phase jitter element. Since the signal including phase jitter is a low frequency signal, a phase jitter removing unit further removes phase jitter by shifting the frequency range to a higher frequency range on the frequency axis and then shifting it to the bandwidth for each processing.
    • PCT No.PCT / JP90 / 00735 Sec。 371 1990年10月2日第 102(e)1990年10月2日日期PCT提交1990年6月6日PCT公布。 WO90 / 16117 PCT出版物 日期:1990年12月27日。一种用于从接收信号中去除线路恶化元件的码间干扰,载波频率偏移和相位抖动等的系统。 自动均衡单元通过符号间干扰来补偿信号恶化。 接下来,载波相位控制单元通过载波频率补偿来补偿信号劣化。 此后,相位抖动干扰去除单元允许通过利用线路特性来增加仅相位抖动元件以容易地提取相位抖动元件。 由于包括相位抖动的信号是低频信号,相位抖动去除单元还通过将频率范围移动到频率轴上的较高频率范围,然后将其移动到每个处理的带宽来消除相位抖动。
    • 64. 发明授权
    • Digital automatic gain control circuit
    • 数字自动增益控制电路
    • US4482973A
    • 1984-11-13
    • US393120
    • 1982-06-28
    • Shigeyuki UnagamiKuninosuke IhiraTakashi Kaku
    • Shigeyuki UnagamiKuninosuke IhiraTakashi Kaku
    • H03G3/20H03G3/30
    • H03G3/3089
    • A digital automatic gain control circuit provided with a first AGC loop and a second AGC loop; activated alternately. The first AGC loop is activated when an input signal is initially supplied. The loop produces a certain digital value calculated as an inverse number of the digital level of the input through predetermined digital arithmetic operations utilizing an approximation polynominal. The calculated digital value is then preset in certain portions of the second AGC loop. The second AGC loop starts operating by using said present value, then uses the digital level of the input itself, instead of the preset value, and produces an automatic gain controlled digital output. Utilizing said preset value as an initial input to the second AGC loop allows for rapid stabilization of the automatic gain controlled digital output.
    • 一种具有第一AGC环路和第二AGC环路的数字自动增益控制电路; 交替激活。 当最初提供输入信号时,第一个AGC环路被激活。 该循环通过利用近似多项式的预定数字运算产生通过输入的数字电平的倒数计算出的某个数字值。 然后将计算出的数字值预设在第二AGC环路的某些部分。 第二AGC循环通过使用所述当前值开始运行,然后使用输入本身的数字电平而不是预设值,并产生自动增益控制的数字输出。 利用所述预设值作为第二AGC环路的初始输入允许自动增益受控数字输出的快速稳定。
    • 67. 发明授权
    • Noise elimination method and apparatus
    • 消噪方法及装置
    • US07173959B2
    • 2007-02-06
    • US10331078
    • 2002-12-27
    • Takashi Kaku
    • Takashi Kaku
    • H04B1/00
    • H04B1/7097H04B3/54H04B2203/5416H04B2203/5425H04B2203/5441H04B2203/5445H04B2203/5458H04B2203/5483H04B2203/5491
    • In a noise elimination method and apparatus, a spread spectrum modulation signal having a data signal and an overlapping noise component at a signal point on a time axis and a noise component at a zero point on the time axis is received. A correlation of the received modulation signal to a spread spectrum code is generated by using a correlating filter. Zero is set at points of the modulation signal other than the signal point where the correlation becomes the maximum, so that the noise component at the zero point is extracted from the modulation signal. The noise component at the signal point is predicted by performing interpolation prediction based on the extracted noise component. The noise component at the signal point is removed from the modulation signal based on the predicted noise component.
    • 在噪声消除方法和装置中,接收在时间轴上的信号点具有数据信号和重叠噪声分量的扩展频谱调制信号以及时间轴零点的噪声分量。 通过使用相关滤波器来生成接收的调制信号与扩频码的相关性。 在除相关变为最大的信号点之外的调制信号的点处设置零,从而从调制信号中提取零点的噪声分量。 通过基于提取的噪声分量执行内插预测来预测信号点处的噪声分量。 基于预测的噪声分量,将信号点的噪声分量从调制信号中去除。