公开(公告)号：US08924337B2

公开(公告)日：2014-12-30

申请号：US13068341

申请日：2011-05-09

申请人： Sarmad Malik ,  Gerald Enzner ,  Jukka Petteri Vartiainen ,  Jari Petteri Sjoberg ,  Ville Mikael Myllyla

发明人： Sarmad Malik ,  Gerald Enzner ,  Jukka Petteri Vartiainen ,  Jari Petteri Sjoberg ,  Ville Mikael Myllyla

IPC分类号： G06N7/02

CPC分类号： G06N7/005

摘要： Both a cascade and a multichannel joint Bayesian estimator are provided for suppressing acoustic echo. An expansion basis (Power/Fourier series) is selected to convert a sample-based input signal xt into a DFT-domain multichannel signal [Xτ,1, . . . Xτ,p]. The posterior of unknown states (e.g., mean Ŵτ and covariance Pτ of the echo path Wτ and the mean âτ and covariance Qτ of the nonlinear coefficients aτ; or channel-wise mean Ŵτ,i and multichannel covariance Pτ of a compound quantity formed by merging together the echo path Wτ and the ith nonlinear coefficient aτ,i) and model parameters θτ are estimated; and Kalman gain factor(s) Kτ are computed for optimal adaptation of the posterior of unknown states. An echo signal Ŷτ is estimated using the multichannel input signal [Xτ,1, . . . Xτ,p] and the adapted posterior; and an error signal Eτ is generated. Residual echo is suppressed by post-filtering the error signal Eτ with a weighting function ψτ which depends on the adapted posterior, and the filtered error signal ŝ′t is then transmitted to a far-end.

摘要翻译： 提供级联和多通道联合贝叶斯估计器来抑制声学回声。 选择扩展基础（功率/傅立叶级数）以将基于采样的输入信号xt转换为DFT域多通道信号[Xτ，1，...， 。 。 Xτ，p]。 未知状态的后验（例如，回波路径Wτ的平均值和协方差Pτ以及非线性系数aτ的平均值和协方差Qτ或通过合并形成的复合数量的通道均值Ŵτ，i和多通道协方差Pτ 一起估计回波路径Wτ和第i个非线性系数aτ，i）和模型参数τ; 和卡尔曼增益因子（K）被计算用于未知状态的后验的最佳适应。 使用多通道输入信号[Xτ，1，...]来估计回波信号Ŷτ。 。 。 Xτ，p]和适应的后部; 并产生误差信号Eτ。 通过对取决于适合的后验的加权函数ψτ对误差信号Eτ进行后滤波来抑制残留回波，然后将滤波后的误差信号发送到远端。

公开(公告)号：US20120290525A1

公开(公告)日：2012-11-15

申请号：US13068341

申请日：2011-05-09

申请人： Sarmad Malik ,  Gerald Enzner ,  Jukka Petteri Vartiainen ,  Jari Petteri Sjoberg ,  Ville Mikael Myllyla

发明人： Sarmad Malik ,  Gerald Enzner ,  Jukka Petteri Vartiainen ,  Jari Petteri Sjoberg ,  Ville Mikael Myllyla

IPC分类号： G06N7/02

CPC分类号： G06N7/005

摘要： Both a cascade and a multichannel joint Bayesian estimator are provided for suppressing acoustic echo. An expansion basis (Power/Fourier series) is selected to convert a sample-based input signal xt into a DFT-domain multichannel signal [Xτ,1, . . . Xτ,p]. The posterior of unknown states (e.g., mean Ŵτ and covariance Pτ of the echo path Wτ and the mean âτ and covariance Qτ of the nonlinear coefficients aτ; or channel-wise mean Ŵτ,i and multichannel covariance Pτ of a compound quantity formed by merging together the echo path Wτ and the ith nonlinear coefficient aτ,i) and model parameters θτ are estimated; and Kalman gain factor(s) Kτ are computed for optimal adaptation of the posterior of unknown states. An echo signal Ŷτ is estimated using the multichannel input signal [Xτ,1, . . . Xτ,p] and the adapted posterior; and an error signal Eτ is generated. Residual echo is suppressed by post-filtering the error signal Eτ with a weighting function ψτ which depends on the adapted posterior, and the filtered error signal ŝ′t is then transmitted to a far-end.

摘要翻译： 提供级联和多通道联合贝叶斯估计器来抑制声学回声。 选择扩展基础（功率/傅立叶级数）以将基于采样的输入信号xt转换为DFT域多通道信号[Xτ，1，...， 。 。 Xτ，p]。 未知状态的后验（例如，回波路径Wτ的平均值和协方差Pτ以及非线性系数aτ的平均值和协方差Qτ或通过合并形成的复合数量的通道均值Ŵτ，i和多通道协方差Pτ 一起估计回波路径Wτ和第i个非线性系数aτ，i）和模型参数τ; 和卡尔曼增益因子（K）被计算用于未知状态的后验的最佳适应。 使用多通道输入信号[Xτ，1，...]来估计回波信号Ŷτ。 。 。 Xτ，p]和适应的后部; 并产生误差信号Eτ。 通过对取决于适合的后验的加权函数ψτ对误差信号Eτ进行后滤波来抑制残留回波，然后将滤波后的误差信号发送到远端。

公开(公告)号：US20050063536A1

公开(公告)日：2005-03-24

申请号：US10871606

申请日：2004-06-17

申请人： Ville Myllyla ,  Gerald Enzner

发明人： Ville Myllyla ,  Gerald Enzner

IPC分类号： H04B1/10 ,  H04M20060101 ,  H04M1/00 ,  H04M1/58 ,  H04M9/00 ,  H04M9/08

CPC分类号： H04M9/082

摘要： This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor β(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

摘要翻译： 本发明公开了对免提电话中的数字声学回声控制（AEC）的改进。 它描述了称为残余回波滤波器的附加自适应滤波器，其被放置在通常的回波消除器之后，并且用于有效和准确地估计残余回波信号b（i）和系统耦合因子β（i），其中 可用于建立AEC系统的有效控制并构建适当的过滤器。 本发明还描述了执行回波消除器，残余回波抑制器和残余回波滤波器的联合操作控制的控制块装置，用于实现更一致的回波消除结果并增强输出信号质量。

公开(公告)号：US06925176B2

公开(公告)日：2005-08-02

申请号：US10871606

申请日：2004-06-17

申请人： Ville Myllylä ,  Gerald Enzner

发明人： Ville Myllylä ,  Gerald Enzner

IPC分类号： H04B1/10 ,  H04M20060101 ,  H04M1/00 ,  H04M1/58 ,  H04M9/00 ,  H04M9/08

CPC分类号： H04M9/082

摘要： This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor β(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

摘要翻译： 本发明公开了对免提电话中的数字声学回声控制（AEC）的改进。 它描述了称为残余回波滤波器的附加自适应滤波器，其被放置在通常的回波消除器之后，并且用于有效和准确地估计残余回波信号b（i）和系统耦合因子β（i），其中 可用于建立AEC系统的有效控制并构建适当的过滤器。 本发明还描述了执行回波消除器，残余回波抑制器和残余回波滤波器的联合操作控制的控制块装置，用于实现更一致的回波消除结果并增强输出信号质量。

公开(公告)号：US07054437B2

公开(公告)日：2006-05-30

申请号：US10608785

申请日：2003-06-27

申请人： Gerald Enzner

发明人： Gerald Enzner

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizations of AEC units. The improvement using the simple statistical adaptive-filter controller is accomplished by optimizing a joint control of an echo canceller and a postfilter.

摘要翻译： 本发明描述了一种用于免提电话中的数字声学回声控制的统计自适应滤波器控制器，用于实现更一致的回声消除结果（即更高的输出信号质量）和更简单的AEC单元的实现。 使用简单的统计自适应滤波器控制器的改进通过优化回波消除器和后置滤波器的联合控制来实现。