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    • 3. 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)。
    • 4. 发明授权
    • Subband echo canceller with adjustable coefficients using a series of
step sizes
    • 子带回波消除器,具有可调系数,使用一系列步长
    • US5272695A
    • 1993-12-21
    • US756622
    • 1991-09-09
    • Shoji MakinoYoichi HanedaYutaka Kanesa
    • Shoji MakinoYoichi HanedaYutaka Kanesa
    • H03H21/00H04B3/23H04M9/08H04J1/00
    • H04M9/082
    • A received input signal and an echo signal resulting from the passage of the received input signal through an echo path are both analyzed or divided into a plurality of common subbands. The received input signal in each subband is supplied to an estimated echo path provided in the subband, by which it is rendered into an echo replica signal. The echo replica signal is subtracted, by a subtractor provided in each subband, from the echo signal in the same subband as the echo replica signal to obtain a residual echo signal. The residual echo signals in the respective subbands are synthesized into a full-band residual echo signal. The estimated echo path in each subband is formed by a digital FIR filter and its filter coefficients are calculated by a coefficient calculation part in the subband, based on the received input signal, the residual echo signal and a step size matrix. The filter coefficients are iteratively updated so that the residual echo signal in each subband may be minimized. The step size matrix is used to define the step size of the filter coefficients and is determined by an acoustic field characteristics calculation part, based on the variation characteristics of an impulse response of the echo path in each subband.
    • 接收到的输入信号和由接收到的输入信号通过回波路径而产生的回波信号都被分析或分成多个公共子带。 每个子带中的接收到的输入信号被提供给在子带中提供的估计回波路径,由此将其呈现为回波复制信号。 通过在每个子带中提供的减法器从与回波复制信号相同子带中的回波信号中减去回波复制信号,以获得残留回波信号。 各个子带中的残余回波信号被合成为全带残留回波信号。 每个子带中的估计回波路径由数字FIR滤波器形成,并且其滤波器系数由子带中的系数计算部分基于接收到的输入信号,残余回波信号和步长矩阵来计算。 滤波器系数被迭代地更新,使得每个子带中的残余回波信号可以被最小化。 步长矩阵用于定义滤波器系数的步长,并且由声场特性计算部分基于每个子带中的回波路径的脉冲响应的变化特性来确定。
    • 6. 发明授权
    • Subband echo cancellation method for multichannel audio teleconference and echo canceller using the same
    • 用于多通道音频电话会议和回波消除器的子带回波消除方法
    • US06246760B1
    • 2001-06-12
    • US08927961
    • 1997-09-11
    • Shoji MakinoSuehiro ShimauchiYoichi HanedaAkira NakagawaJunji Kojima
    • Shoji MakinoSuehiro ShimauchiYoichi HanedaAkira NakagawaJunji Kojima
    • H04M100
    • H04M9/082H04M1/60
    • In a subband echo cancellation for a multichannel teleconference, received signals x1(k), x2(k), . . . , xI(k) of each channel are divided into N subband signals, an echo y(k) picked up by a microphone 16j after propagation over an echo path is divided into N subband signals y0(k), . . . ,yN−1(k), and vectors each composed of a time sequence of subband received signals x1(k), . . . , xI(k) are combined for each corresponding subband. The combined vector and an echo cancellation error signal in the corresponding subband are input into an estimation part 19n, wherein a cross-correlation variation component is extracted. The extracted component is used as an adjustment vector to iteratively adjust the impulse response of an estimated echo path. The combined vector is applied to an estimated echo path 18n formed by the adjusted value to obtain an echo replica. An echo cancellation error signal en(k) is calculated from the echo replica and a subband echo yn(k).
    • 在多声道电话会议的子带回波消除中,接收信号x1(k),x2(k),... 。 。 ,每个信道的xI(k)被划分为N个子带信号,在通过回波路径传播之后由麦克风16j拾取的回波y(k)被划分为N个子带信号y0(k)。 。 。 ,yN-1(k),以及由子带接收信号x1(k)的时间序列组成的矢量。 。 。 ,对于每个对应的子带组合xI(k)。 将相应子带中的组合矢量和回波消除误差信号输入到估计部分19n中,其中提取互相关变化分量。 提取的分量被用作调整向量以迭代地调整估计回波路径的脉冲响应。 将组合矢量应用于由调整值形成的估计回波路径18n,以获得回波复制品。 从回波复制品和子带回波yn(k)计算回波消除误差信号en(k)。