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    • 3. 发明授权
    • Echo cancelling method and apparatus using fast projection scheme
    • 使用快速投影方案的回波消除方法和装置
    • US5539731A
    • 1996-07-23
    • US385989
    • 1995-02-09
    • Yoichi HanedaShoji MakinoMasashi TanakaYutaka Kaneda
    • Yoichi HanedaShoji MakinoMasashi TanakaYutaka Kaneda
    • H04M9/08
    • H04M9/082
    • In an echo cancelling method of a p-order fast projection algorithm which subtracts an estimated echo signal y(k) from a microphone output signal u(k) to obtain an error signal e(k), adaptively calculates a pre-filter coefficient .beta.(k) from the auto-correlation of a received speech signal x(k) and the error signal, generating an intermediate variable z(k) updated by a coefficient s(k) obtained by smoothing the pre-filter coefficient, convolutes the received speech signal x(k) and the intermediate variable z(k), calculates the inner product of the auto-correlation of the received speech signal and the smoothed pre-filter coefficient s(k) and adding the inner product and the convoluted output to obtain the estimated echo signal, the magnitudes of the received speech signal x(k) and the error signal e(k) are compared and when the result of comparison satisfies a predetermined condition, a reset signal is generated to set the pre-filter coefficient .beta.(k) to zero for at least a period of time p, thereby preventing the accuracy of estimated echo characteristics from lowering during double-talk or send single-talk.
    • 在从麦克风输出信号u(k)中减去估计回波信号+ E,cir y + EE(k)以获得误差信号e(k)的p阶快速投影算法的回波消除方法中,自适应地计算 来自接收到的语音信号x(k)的自相关的预滤波器系数β(k)和误差信号,生成由通过平滑预处理得到的系数s(k)更新的中间变量z(k) 滤波器系数,对接收到的语音信号x(k)和中间变量z(k)进行卷积,计算接收的语音信号的自相关和平滑的预滤波器系数s(k)的内积, 产品和卷积输出以获得估计的回波信号,接收到的语音信号x(k)和误差信号e(k)的大小进行比较,并且当比较结果满足预定条件时,产生复位信号 将预滤波器系数β(k)设置为零 一段时间p,从而防止估计的回波特性的精度在双向通话或发送单通话期间降低。
    • 4. 发明授权
    • Method and apparatus for multi-channel acoustic echo cancellation and recording medium with the method recorded thereon
    • 用于多通道声回波消除和记录介质的方法和装置,其方法记录在其上
    • US06553122B1
    • 2003-04-22
    • US09260515
    • 1999-03-02
    • Suehiro ShimauchiYoichi HanedaShoji MakinoYutaka Kaneda
    • Suehiro ShimauchiYoichi HanedaShoji MakinoYutaka Kaneda
    • H03B320
    • H04M9/082
    • Even if received signals are highly cross-correlated, echoes can be effectively cancelled and no psychoacoustical problems arise. A received signal xi(k) (where i=1, 2, . . . , N) and an additive signal ai(k) are added together, and the added output is used to drive a speaker i and input into an echo cancellation filter 405i. The received signal xi(k) and the additive signal ai(k) are input into adaptive filters 401i and 402i, respectively. The difference between the sum of the outputs from all the filters 401i and all the filters 402i and an echo ym(k) is detected as an error em(k). The coefficients of all the filters 401i and 402i are updated to reduce the error em(k). When the error em(k) is made sufficiently small, the coefficients of the filters 402i are transferred to the filters 405i. The sum of the outputs from all the filters 405i is detected as an echo replica, and the difference between the echo replica and the echo ym(k) is output.
    • 即使接收到的信号是高度相互关联的,也可以有效地消除回波并且不产生心理声学问题。接收信号xi(k)(其中i = 1,2,...,N)和加法信号ai(k) 被添加在一起,并且所添加的输出用于驱动扬声器i并输入到回声消除滤波器405i中。 接收信号xi(k)和加法信号ai(k)分别输入到自适应滤波器401i和402i中。 检测来自所有滤波器401i和全部滤波器402i的输出和回波ym(k)之间的差值作为误差em(k)。 所有滤波器401i和402i的系数被更新以减少误差em(k)。 当误差em(k)足够小时,滤波器402i的系数被传送到滤波器405i。 检测来自所有滤波器405i的输出的和作为回波复制,并且输出回波复制和回波ym(k)之间的差。
    • 5. 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)。