公开(公告)号：US07072465B1

公开(公告)日：2006-07-04

申请号：US09228772

申请日：1999-01-06

申请人： Jacob Benesty ,  Tomas Fritz Gaensler ,  Steven Leslie Gay ,  Man Mohan Sondhi

发明人： Jacob Benesty ,  Tomas Fritz Gaensler ,  Steven Leslie Gay ,  Man Mohan Sondhi

IPC分类号： H04B3/23

CPC分类号： H04B3/234 ,  H03H2021/0063

摘要： A robust adaptive filter for use in a network echo canceller or other digital signal processing application utilizes a coefficient vector update device that, through the application of fast converging algorithms to a fast impulse response filter yields fast convergence of the adaptive filter's characteristics with the avoidance of divergence due to the onset of double talk. Robustness is also provided, via an adaptive scale non-linearity device which applies an adaptive scale non-linearity to the filter algorithms fed to the fast impulse response filter by the coefficient vector update device, so that the samples of an echo signal to be cancelled which are taken during the onset of double talk can be handled in such a manner that after the double talk detector causes adaptation to cease, the initial, potentially disturbing samples do not cause significant divergence in the filter system.

摘要翻译： 用于网络回波消除器或其他数字信号处理应用的鲁棒自适应滤波器利用系数向量更新装置，其通过将快速收敛算法应用于快速脉冲响应滤波器产生自适应滤波器特征的快速收敛，避免了 由于双重谈话的开始，分歧。 还通过自适应标度非线性装置提供鲁棒性，其对由系数向量更新装置馈送到快速脉冲响应滤波器的滤波器算法施加自适应标度非线性，使得要消除的回波信号的样本 可以以双方通话检测器引起适应停止的方式处理在双重通话开始期间拍摄的，初始的潜在干扰的样本不会在滤波器系统中引起明显的发散。

公开(公告)号：US06751314B1

公开(公告)日：2004-06-15

申请号：US09431847

申请日：1999-11-02

申请人： Jacob Benesty ,  Tomas Fritz Gaensler ,  Steven Leslie Gay ,  Man Mohan Sondhi

发明人： Jacob Benesty ,  Tomas Fritz Gaensler ,  Steven Leslie Gay ,  Man Mohan Sondhi

IPC分类号： H04M100

CPC分类号： H04B3/23

摘要： A method is presented for dynamic resource allocation in a speech signal echo canceler enabling more efficient echo cancellation and as a result the ability for an Integrated Circuit to handle additional channels than heretofore possible. This is accomplished by applying one or more of three efficiency enhancing strategies. First, no update of coefficients is computed or convolution performed if the power level of the far end speech signal is below a given threshold. Second, convolution is limited to the set of active taps (i.e., taps that account for most of the power in the echo). Third, new coefficients are computed only when the power of the error signal is greater than a given threshold. Lastly, the set of active coefficients is periodically updated. These strategies release computational resources from unnecessary computations and divert them to other channels that may be active.

摘要翻译： 提出了一种用于语音信号回波消除器中的动态资源分配的方法，其实现更有效的回波消除，并且因此能够使集成电路处理比以前更多的附加信道。 这是通过应用三种效率提高策略中的一种或多种实现的。 首先，如果远端语音信号的功率电平低于给定阈值，则不会计算系数更新或卷积。 第二，卷积限于有效抽头的集合（即，回波中大部分功率的抽头）。 第三，只有当误差信号的功率大于给定的阈值时才计算新的系数。 最后，定期更新该有源系数集。 这些策略从不必要的计算中释放计算资源，并将其转移到可能处于活动状态的其他通道。

公开(公告)号：US06744886B1

公开(公告)日：2004-06-01

申请号：US09227327

申请日：1999-01-06

申请人： Jacob Benesty ,  Tomas Fritz Gaensler ,  Steven Leslie Gay ,  Man Mohan Sondhi

发明人： Jacob Benesty ,  Tomas Fritz Gaensler ,  Steven Leslie Gay ,  Man Mohan Sondhi

IPC分类号： H04M908

CPC分类号： H04B3/234 ,  H03H2021/0063

摘要： An adaptive filter suitable for network echo cancellation and other applications contains a coefficient vector update device for feeding coefficient vector updates to a finite impulse response filter in accordance with fast converging algorithms. A double talk detector is included for causing filter adaptation to cease in the presence of double talk in the system being echo cancelled. The coefficient vector update device utilizes a proportional affine projection algorithm to provide fast convergence of the filter system and improved performance over other filter devices utilizing different fast converging algorithms.

摘要翻译： 适用于网络回波消除和其他应用的自适应滤波器包含用于根据快速收敛算法向有限脉冲响应滤波器馈送系数向量更新的系数向量更新装置。 包括双通话检测器，用于在系统中存在双重通话时停止响应消除过滤器适配。 系数向量更新装置利用比例仿射投影算法提供了滤波系统的快速收敛，并且利用不同的快速收敛算法提高了超过其它滤波器的性能。

公开(公告)号：US06526141B2

公开(公告)日：2003-02-25

申请号：US09730442

申请日：2000-12-05

申请人： Jacob Benesty ,  Steven Leslie Gay

发明人： Jacob Benesty ,  Steven Leslie Gay

IPC分类号： H04M100

CPC分类号： H04B3/23 ,  H03H2021/0063

摘要： The invention is a method and apparatus for performing adaptive filtering, and particularly echo cancellation, utilizing an efficient and effective adaptive algorithm. The invention is particularly useful in connection with network echo cancellation but is more broadly applicable to any situation where an adaptive estimate of a signal must be generated in real-time. The invention includes an improved proportionate normalized least mean squares algorithm for generating an impulse response estimate that is useful for generating an echo cancellation signal to be subtracted from the echo containing signal.

摘要翻译： 本发明是一种利用有效且有效的自适应算法执行自适应滤波，特别是回波消除的方法和装置。 本发明在网络回波消除方面特别有用，但更广泛地适用于必须实时地产生信号的自适应估计的任何情况。本发明包括用于产生脉冲响应的改进的成比例的归一化最小均方算法 估计对于生成要从回波包含信号中减去的回波消除信号是有用的。

公开(公告)号：US5677951A

公开(公告)日：1997-10-14

申请号：US492469

申请日：1995-06-19

申请人： Steven Leslie Gay

发明人： Steven Leslie Gay

IPC分类号： G05B13/02 ,  H03H17/00 ,  H03H17/02 ,  H03H21/00 ,  H04B3/23 ,  H04M9/00 ,  H04J1/00 ,  G06F15/31

CPC分类号： H04B3/23 ,  H03H21/0043

摘要： A dynamically regularized fast recursive least squares (DR-FRLS) adaptive filter and method are disclosed which provide O(N) computational complexity and which have dynamically adjusted regularization in real-time without requiring restarting the adaptive filtering. The adaptive filter includes a memory for storing at least one program, including a dynamically regularized fast recursive least squares (DR-FRLS) program; and a processor which responds to the DR-FRLS program for adaptively filtering an input signal and for generating an output signal associated with the input signal.

摘要翻译： 公开了一种动态规则化的快速递归最小二乘法（DR-FRLS）自适应滤波器和方法，其提供O（N）计算复杂度，并且其实时动态调整正则化，而不需要重新启动自适应滤波。 自适应滤波器包括用于存储至少一个程序的存储器，包括动态规则化的快速递归最小二乘法（DR-FRLS）程序; 以及响应于DR-FRLS程序的处理器，用于对输入信号进行自适应滤波并产生与输入信号相关联的输出信号。