公开(公告)号：US20050053177A1

公开(公告)日：2005-03-10

申请号：US10917411

申请日：2004-08-13

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H03H17/02 ,  H03H17/06 ,  H03H21/00 ,  H04B1/10 ,  H04L1/02

CPC分类号： H03H21/0012

摘要： 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.

摘要翻译： 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，以便最小化 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。

公开(公告)号：US20050041764A1

公开(公告)日：2005-02-24

申请号：US10920198

申请日：2004-08-18

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H03H21/00 ,  H04B1/10 ,  H04B3/06 ,  H04B7/005 ,  H04L25/03 ,  H03K5/159 ,  H03H7/30 ,  H03H7/40

CPC分类号： H04L25/03038 ,  H03H21/0012 ,  H04L25/0305 ,  H04L2025/0363

摘要： An adaptive filter for an FM receiver comprises a digital filter, an error detection section for detecting an error between the output amplitude 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 coefficient updating section determines the amounts of update of the tap coefficients based on a value determined by applying square root compression conversion processing to the amounts of correlation between delayed values of the input signal and an output signal. Thus, the adaptive filter can perform proper adaptive processing at high speed, thereby eliminating multipath distortion with reliability.

摘要翻译： 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幅度与参考值之间的误差的误差检测部分，以及用于更新抽头系数的系数更新部分，以使检测到的误差最小化。 系数更新部分基于通过将平方根压缩转换处理应用于输入信号的延迟值和输出信号之间的相关量而确定的值来确定抽头系数的更新量。 因此，自适应滤波器可以高速执行适当的自适应处理，从而以可靠性消除多径失真。

公开(公告)号：US20050124310A1

公开(公告)日：2005-06-09

申请号：US11000928

申请日：2004-12-02

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H04B7/005 ,  H04B1/10 ,  H04B1/16

CPC分类号： H04B1/1661 ,  H04B1/1081

摘要： A receiver capable of removing multipass distortion and improving an S/N. The receiver of the invention comprises a multipass removal filter for removing the multipass distortion from an intermediate frequency signal digitized by an A/D converter, an FM detector for detecting a desired signal outputted from the multipass removal filter, a mute processor and a high frequency removal filter as well as a stereo demodulator which are provided for processing a composite signal outputted from the FM detector and demodulating the same into left-right channel signals. The receiver further comprises a first field strength detector for detecting a first field strength from the intermediate frequency signal, a second field strength detector for detecting a second field strength from the desired signal, and a noise amount detector for detecting a noise component of the second field strength. A controller operates to perform a mute control on the mute processor, a high-cut control on the high frequency removal filter, and a separation control on the stereo demodulator, in response to the changes of the first field strength and the noise component.

摘要翻译： 能够消除多通道失真并改善S / N的接收机。 本发明的接收机包括用于从由A / D转换器数字化的中频信号中去除多通道失真的多通道去除滤波器，用于检测从多通道去除滤波器输出的期望信号的FM检波器，静音处理器和高频 去除滤波器以及立体声解调器，其被提供用于处理从FM检测器输出的复合信号并将其解调为左右声道信号。 接收机还包括用于从中频信号检测第一场强的第一场强检测器，用于从期望信号检测第二场强的第二场强检测器和用于检测第二场强的噪声分量的噪声量检测器 场强。 响应于第一场强和噪声分量的变化，控制器操作以对静音处理器执行静音控制，高频去除滤波器上的高切割控制和立体声解调器上的分离控制。

公开(公告)号：US20050044121A1

公开(公告)日：2005-02-24

申请号：US10920293

申请日：2004-08-18

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H03H17/02 ,  H03H17/06 ,  H03H21/00 ,  H04B1/10 ,  H04B1/26 ,  G06F17/10

CPC分类号： H03H21/0012

摘要： An adaptive filter for an FM receiver comprises a digital filter, an error detection section for detecting an error between the output amplitude of the digital filter and a reference value, and a coefficient updating section for updating tap coefficients so as to minimize the detected error. Further, a delay circuit is provided in an output stage of the digital filter so as to reduce an operation load. Thus, the adaptive filter can improve an operation accuracy of the digital filter, thereby eliminating multipath distortion with reliability.

摘要翻译： 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，以使检测到的误差最小化。 此外，在数字滤波器的输出级设置延迟电路，以减少操作负载。 因此，自适应滤波器可以提高数字滤波器的操作精度，从而以可靠性消除多径失真。

公开(公告)号：US07155245B2

公开(公告)日：2006-12-26

申请号：US10917411

申请日：2004-08-13

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H04B1/00 ,  H04B7/01

CPC分类号： H03H21/0012

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20050123079A1

公开(公告)日：2005-06-09

申请号：US11000977

申请日：2004-12-02

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H04B1/26 ,  H03J1/00 ,  H04B1/10 ,  H04L27/06

CPC分类号： H03J1/0066

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20050123035A1

公开(公告)日：2005-06-09

申请号：US10995392

申请日：2004-11-24

申请人： Yuji Yamamoto ,  Toshiaki Kubuki

发明人： Yuji Yamamoto ,  Toshiaki Kubuki

IPC分类号： H03H21/00 ,  H03H17/02 ,  H03H17/06 ,  H04B3/06 ,  H04B7/005 ,  H04L25/03 ,  H03K5/159

CPC分类号： H03H21/0012 ,  H04L25/03038 ,  H04L2025/03477 ,  H04L2025/03617 ,  H04L2025/03681

摘要： A multipath elimination filter comprises a digital filter for receiving a digitalized FM modulation signal or phase modulation signal as its input signal, and eliminating multipath distortion from the input signal by adjusting tap factors for the input signal, an envelope detecting section for detecting an envelope of the input signal to generate a reference signal, an error detecting section for generating an error signal by performing a differential operation on a desired signal generated by the digital filter and the reference signal, an error component limiting section for monitoring the error signal for a direct-current component and controlling an amplitude of the error signal to generate a corrected error signal, and a tap factor updating section for adjusting the tap factors based on the corrected error signal so that the amplitude of the error signal approaches zero. This makes the entire system converge toward stabilization to eliminate multipath distortion.

摘要翻译： 多路径消除滤波器包括数字滤波器，用于接收数字化FM调制信号或相位调制信号作为其输入信号，并且通过调整输入信号的分接因子来消除来自输入信号的多径失真;包络检测部分，用于检测信号 用于产生参考信号的输入信号;误差检测部分，用于通过对由数字滤波器产生的期望信号和参考信号执行差分运算来产生误差信号;误差分量限制部分，用于监视直接的误差信号 并且控制误差信号的幅度以产生校正的误差信号;以及抽头因子更新部分，用于基于校正的误差信号调整抽头因子，使得误差信号的幅度接近零。 这使得整个系统趋向稳定以消除多径失真。