利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

4 条记录 (耗时 0.018 秒)

    Echo canceler and echo canceling method
    1.
    发明授权
    Echo canceler and echo canceling method 有权
    回波消除器和回波消除方法

    公开(公告)号：US08073133B2

    公开(公告)日：2011-12-06

    申请号：US11976257

    申请日：2007-10-23

    申请人： Takashi Ishiguro ,  Koichi Kihara ,  Yuzuru Masuya ,  Junji Arai

    发明人： Takashi Ishiguro ,  Koichi Kihara ,  Yuzuru Masuya ,  Junji Arai

    IPC分类号： H04M9/08 ,  H04B3/20

    CPC分类号： H04B3/234

    摘要： An echo canceler has an adaptive filter that generates an echo replica signal from a far-end signal. The filter coefficients of the adaptive filter are updated according to a residual error signal, which is obtained by subtracting the echo replica signal from a near-end signal to cancel echo. A background noise estimator estimates the near-end background noise power level from the residual error signal. A step size calculator uses the estimated near-end background noise power in determining the step size of the adaptive updating of the filter coefficients. When the estimated near-end background noise level is high, a small step size is used, which improves echo cancellation under these conditions. When the estimated near-end background noise level is low, a larger step size is used to permit rapid convergence of the filter coefficients.

    摘要翻译： 回波消除器具有自适应滤波器，其从远端信号产生回波复制信号。 根据剩余误差信号来更新自适应滤波器的滤波器系数，该残差误差信号通过从近端信号中减去回波复制信号而获得，以消除回波。 背景噪声估计器从剩余误差信号估计近端背景噪声功率电平。 步长计算器使用估计的近端背景噪声功率来确定滤波器系数的自适应更新的步长。 当估计的近端背景噪声水平高时，使用小的步长，这在这些条件下改善回声消除。 当估计的近端背景噪声电平低时，使用较大的步长来允许滤波器系数的快速收敛。

    Redundancy gateway system
    2.
    发明授权
    Redundancy gateway system 有权
    冗余网关系统

    公开(公告)号：US07715374B2

    公开(公告)日：2010-05-11

    申请号：US12000133

    申请日：2007-12-10

    申请人： Yuzuru Masuya ,  Koichi Kihara ,  Koichi Yamazaki ,  Takashi Ishiguro ,  Yasuhiro Tazoi ,  Junji Arai ,  Takeshi Shimomura

    发明人： Yuzuru Masuya ,  Koichi Kihara ,  Koichi Yamazaki ,  Takashi Ishiguro ,  Yasuhiro Tazoi ,  Junji Arai ,  Takeshi Shimomura

    IPC分类号： H04L12/66 ,  H04L12/56

    CPC分类号： H04J3/0632 ,  H04J3/14 ,  H04J2203/006 ,  H04J2203/0087 ,  H04L65/103

    摘要： A redundancy gateway system that can avoid short interruption of data communication caused by system switching in gateway units configured in a multiplex manner for a plurality of systems, and that can maintain the communication state prior to the system switching and avoid degradation of communication quality. A duplicate of a received packet is generated, thereby supplying the packet of the same content to a configuration of gateway units. For each packet, a common write pointer corresponding to identification information appended to the packet is generated. Each gateway unit writes the packet to its own jitter buffer in accordance with the common write pointer corresponding to each supplied packet, sequentially reads out the written packet from the jitter buffer, and generates a TDM signal. One of the gateway units is selectively switched and only the TDM signal generated by the one gateway unit is supplied to a TDM network.

    摘要翻译： 一种冗余网关系统，其能够避免由以多路复用方式为多个系统配置的网关单元中的系统交换引起的数据通信的短暂中断，并且能够在系统切换之前保持通信状态并避免通信质量下降。 产生接收到的分组的副本，从而将相同内容的分组提供给网关单元的配置。 对于每个分组，生成与附加到分组的标识信息相对应的公共写指针。 每个网关单元根据与每个提供的分组相对应的公共写指针将分组写入其自身的抖动缓冲器，从抖动缓冲器顺序读出写入的分组，并产生TDM信号。 选择性地切换网关单元之一，并且只有由一个网关单元生成的TDM信号被提供给TDM网络。

    Echo canceler and echo canceling method
    3.
    发明申请
    Echo canceler and echo canceling method 有权
    回波消除器和回波消除方法

    公开(公告)号：US20080175375A1

    公开(公告)日：2008-07-24

    申请号：US11976257

    申请日：2007-10-23

    申请人： Takashi Ishiguro ,  Koichi Kihara ,  Yuzuru Masuya ,  Junji Arai

    发明人： Takashi Ishiguro ,  Koichi Kihara ,  Yuzuru Masuya ,  Junji Arai

    IPC分类号： H04M9/08

    CPC分类号： H04B3/234

    摘要： An echo canceler has an adaptive filter that generates an echo replica signal from a far-end signal. The filter coefficients of the adaptive filter are updated according to a residual error signal, which is obtained by subtracting the echo replica signal from a near-end signal to cancel echo. A background noise estimator estimates the near-end background noise power level from the residual error signal. A step size calculator uses the estimated near-end background noise power in determining the step size of the adaptive updating of the filter coefficients. When the estimated near-end background noise level is high, a small step size is used, which improves echo cancellation under these conditions. When the estimated near-end background noise level is low, a larger step size is used to permit rapid convergence of the filter coefficients.

    摘要翻译： 回波消除器具有自适应滤波器，其从远端信号产生回波复制信号。 根据剩余误差信号来更新自适应滤波器的滤波器系数，该残差误差信号通过从近端信号中减去回波复制信号而获得，以消除回波。 背景噪声估计器从剩余误差信号估计近端背景噪声功率电平。 步长计算器使用估计的近端背景噪声功率来确定滤波器系数的自适应更新的步长。 当估计的近端背景噪声水平高时，使用小的步长，这在这些条件下改善回声消除。 当估计的近端背景噪声电平低时，使用较大的步长来允许滤波器系数的快速收敛。