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    • 9. 发明授权
    • Echo cancelling method and echo canceller using the same
    • 回波消除方法和回波消除器使用相同
    • US5408530A
    • 1995-04-18
    • US127375
    • 1993-09-28
    • Shoji MakinoYutaka Kaneda
    • Shoji MakinoYutaka Kaneda
    • H04B3/23H04M9/08
    • H04M9/082
    • A received signal vector x(n), a coefficient error covariance matrix P(n) from a memory part 12 and a forgetting factor .nu. from a memory part 13 are provided to a gain calculating part 14 to obtain a gain vector k(n). The thus obtained gain vector k(n) and an error e(n) between an echo and an echo replica are multiplied in a multiplying part 16. The multiplied output and a filter coefficient h(n) from a memory part 18 are added together to update the latter. The thus updated filter coefficient is used as the filter coefficient of an estimated echo path (an FIR filter, for example). The coefficient error covariance matrix P(n), the gain vector k(n), the received signal vector x(n) and the forgetting factor .nu. are provided to an updating part 19 to update the coefficient error covariance matrix P(n), and an adjustment matrix A representing an expectation of an impulse response variation of an echo path is added to the updated coefficient error covariance matrix P(n) and the added value is used as a new coefficient error covariance matrix P(n).
    • 接收信号矢量x(n),来自存储器部分12的系数误差协方差矩阵P(n)和来自存储器部分13的遗忘因子nu被提供给增益计算部分14以获得增益矢量k(n) 。 如此获得的增益矢量k(n)和回波和回波复制品之间的误差e(n)在乘法部分16中相乘。将乘法输出和来自存储器部分18的滤波器系数h(n)相加在一起 更新后者。 将这样更新的滤波器系数用作估计回波路径的滤波器系数(例如FIR滤波器)。 将系数误差协方差矩阵P(n),增益矢量k(n),接收信号矢量x(n)和遗忘因子nu提供给更新部分19以更新系数误差协方差矩阵P(n) 并且将表示回波路径的脉冲响应变化的期望的调整矩阵A添加到更新的系数误差协方差矩阵P(n),并且将附加值用作新的系数误差协方差矩阵P(n)。