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    • 41. 发明授权
    • Multipath distortion eliminating filter
    • 多路失真消除滤波器
    • US07155245B2
    • 2006-12-26
    • US10917411
    • 2004-08-13
    • Yuji YamamotoToshiaki Kubuki
    • Yuji YamamotoToshiaki Kubuki
    • H04B1/00H04B7/01
    • H03H21/0012
    • An adaptive filter for an FM receiver comprises a digital filter, an error detection section for detecting an error between the amplitude of the output signal of the digital filter and a reference value, and a coefficient updating section for updating tap coefficients so as to minimize the error detected. The reference value for determining the error is variably set according to the amplitude of an input signal. This eliminates the effect of Doppler fading included in the reception wave and stabilize the adaptive processing. Thus, the adaptive filter can remove multipath distortion with reliability.
    • 用于FM接收机的自适应滤波器包括数字滤波器,用于检测数字滤波器的输出信号的幅度与参考值之间的误差的误差检测部分和用于更新抽头系数的系数更新部分,以使 检测到错误 用于确定误差的参考值根据输入信号的幅度可变地设定。 这消除了包括在接收波中的多普勒衰落的影响并且稳定了自适应处理。 因此,自适应滤波器可以可靠地去除多径失真。
    • 50. 发明申请
    • Receiver
    • 接收器
    • US20050123079A1
    • 2005-06-09
    • US11000977
    • 2004-12-02
    • Yuji YamamotoToshiaki Kubuki
    • Yuji YamamotoToshiaki Kubuki
    • H04B1/26H03J1/00H04B1/10H04L27/06
    • H03J1/0066
    • A receiver capable of stabilizing its multipass removal filter and thus ensuring an acceptable reception performance, without being affected by a change in the reception sensitivity or the like. The receiver comprises a front end unit for outputting an intermediate frequency signal by mixing/detecting, in accordance with a local oscillation signal, a high frequency received signal received by a reception antenna, an A/D converter for converting an intermediate frequency signal into a digital intermediate frequency signal and outputting the same, an amplitude adjuster for adjusting the amplitude of the digital intermediate frequency signal to a predetermined value and outputting the same, and a multipass removal filter for removing a multipass distortion of a signal outputted from the amplitude adjuster and then outputting a desired signal. The receiver also includes an amplitude supervisor which operates to supervise a change of the above outputted signal, and changes an adjusting period τ of the amplitude adjuster once the change of the above outputted signal exceeds a predetermined value. The receiver further includes a controller which, during an automatic tuning (selection of broadcasting stations), fixes the tap coefficient of the multipass removal filter.
    • 一种能够稳定其多通道去除滤波器并因此确保可接受的接收性能的接收机,而不受接收灵敏度等的改变的影响。 接收机包括:前端单元,用于通过根据本地振荡信号混合/检测由接收天线接收的高频接收信号来输出中频信号; A / D转换器,用于将中频信号转换为 数字中频信号并输出​​该数字中频信号,用于将数字中频信号的幅度调整到预定值并输出的幅度调节器,以及用于去除从幅度调节器输出的信号的多路失真的多通道去除滤波器,以及 然后输出所需信号。 接收机还包括振幅监视器,其操作以监视上述输出信号的变化,并且一旦上述输出信号的改变超过预定值,则改变幅度调节器的调整周期τ。 接收机还包括控制器,其在自动调谐(选择广播站)期间固定多通道去除滤波器的抽头系数。