公开(公告)号：US07408891B2

公开(公告)日：2008-08-05

申请号：US10446359

申请日：2003-05-28

申请人： Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

发明人： Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

IPC分类号： H04B3/20 ,  H04M9/08

CPC分类号： H04B3/23

摘要： An echo canceller comprising a digital filter having adaptive coefficients which are updated to simulate an echo response, a temporary register for storing default coefficients, and a controller for monitoring ERLE and in the event the ERLE is greater than a first predetermined threshold then enabling the digital filter and replacing the default coefficients in the temporary register with the adaptive coefficients, and in the event the ERLE is less than a second predetermined threshold then disabling the digital filter and replacing the adaptive coefficients with said the default coefficients from the temporary register.

摘要翻译： 一种回声消除器，包括具有被更新以模拟回波响应的自适应系数的数字滤波器，用于存储默认系数的临时寄存器，以及用于监视ERLE的控制器，以及在所述ERLE大于第一预定阈值的情况下， 过滤并用自适应系数替换临时寄存器中的默认系数，并且在ERLE小于第二预定阈值的情况下，禁用数字滤波器并用来自临时寄存器的所述默认系数替换自适应系数。

公开(公告)号：US07215762B2

公开(公告)日：2007-05-08

申请号：US11060514

申请日：2005-02-16

申请人： Yonghua Fang ,  Mirjana Popovic ,  Dieter Schulz

发明人： Yonghua Fang ,  Mirjana Popovic ,  Dieter Schulz

IPC分类号： H04M7/04 ,  H04M9/00

CPC分类号： H04M7/0096 ,  H04B3/493 ,  H04M3/002 ,  H04M3/28 ,  H04M3/42314 ,  H04M7/14

摘要： A method of selecting an optimum impedance for a loop start trunk line, comprising successively applying respective ones of a plurality of impedance settings to the loop start trunk line, for each impedance setting measuring the impulse response of the trans-hybrid echo path by applying audio test signals to obtain a time-domain trans-hybrid transfer function and deriving a frequency-domain spectrum representative of trans-hybrid loss, and then calculating figure of merit of the transfer function based on the power spectrum. Once all impedance settings have been tested, the optimum impedance is selected as the impedance setting associated with the highest calculated figure of merit.

摘要翻译： 一种选择环路起始干线的最佳阻抗的方法，包括：针对每个通过应用音频测量跨混合回波路径的脉冲响应的阻抗设置，将多个阻抗设置中的相应的阻抗设置连续地应用于环路起始干线 测试信号以获得时域跨混合传递函数并导出代表跨混合损耗的频域频谱，然后基于功率谱计算传递函数的品质因数。 一旦所有的阻抗设置都被测试，最佳阻抗被选择为与最高计算品质因数相关联的阻抗设置。

公开(公告)号：US06956830B2

公开(公告)日：2005-10-18

申请号：US10448155

申请日：2003-05-29

申请人： Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

发明人： Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

IPC分类号： H04B3/23 ,  H04B3/20

CPC分类号： H04B3/23

摘要： An echo cancellation system for detecting and canceling echo from a network speech path, comprising a pool of echo locators for detecting pure echo delay and dispersion of time, a pool of echo cancellers, a pool of line watchdogs for detecting presence or absence of echo in the network speech path, and a control system for (i) locating and applying an echo locator from the pool of echo locators to the network speech path for detecting the pure echo delay and dispersion of time of any echo in the network speech path, and thereafter returning the echo locator to the pool of echo locators; (ii) locating and applying an echo canceller from the pool of echo cancellers to the network speech path for canceling the echo using the pure delay and dispersion time, and thereafter returning the echo canceller to the pool of echo cancellers; and (iii) locating and applying a line watchdog from the pool of line watchdogs to the network speech path for detecting said presence or absence of echo, and in the event the presence of said echo is detected then re-executing (i).

摘要翻译： 一种用于检测和消除来自网络语音路径的回波的回波消除系统，包括用于检测纯回波延迟和时间分散的回波定位器池，回波消除器池，用于检测回波存在或不存在的线路监视器池 网络语音路径和用于（i）将回波定位器从回波定位器池定位并应用到网络语音路径的控制系统，用于检测网络语音路径中的任何回波的纯回波延迟和时间的离散，以及 然后将回波定位器返回到回波定位器池; （ii）使用回波消除器池将回波消除器定位并应用于网络语音路径，以使用纯延迟和分散时间来消除回波，然后将回波消除器返回到回波消除器池; 以及（iii）将来自线路看门狗的线路看门狗定位和应用到网络语音路径，以检测所述有无回声，并且在检测到所述回波的存在的情况下，然后重新执行（i）。

公开(公告)号：US20050207565A1

公开(公告)日：2005-09-22

申请号：US11060514

申请日：2005-02-16

申请人： Yonghua Fang ,  Mirjana Popovic ,  Dieter Schulz

发明人： Yonghua Fang ,  Mirjana Popovic ,  Dieter Schulz

IPC分类号： H04B1/58 ,  H04B3/20 ,  H04B3/46 ,  H04M3/00 ,  H04M3/28 ,  H04M7/00 ,  H04M7/14 ,  H04M1/00

CPC分类号： H04M7/0096 ,  H04B3/493 ,  H04M3/002 ,  H04M3/28 ,  H04M3/42314 ,  H04M7/14

摘要： A method of selecting an optimum impedance for a loop start trunk line, comprising successively applying respective ones of a plurality of impedance settings to the loop start trunk line, for each impedance setting measuring the impulse response of the trans-hybrid echo path by applying audio test signals to obtain a time-domain trans-hybrid transfer function and deriving a frequency-domain spectrum representative of trans-hybrid loss, and then calculating figure of merit of the transfer function based on the power spectrum. Once all impedance settings have been tested, the optimum impedance is selected as the impedance setting associated with the highest calculated figure of merit.

摘要翻译： 一种选择环路起始干线的最佳阻抗的方法，包括：针对每个通过应用音频测量跨混合回波路径的脉冲响应的阻抗设置，将多个阻抗设置中的相应的阻抗设置连续地应用于环路起始干线 测试信号以获得时域跨混合传递函数并导出代表跨混合损耗的频域频谱，然后基于功率谱计算传递函数的品质因数。 一旦所有的阻抗设置都被测试，最佳阻抗被选择为与最高计算品质因数相关联的阻抗设置。

公开(公告)号：US20050169458A1

公开(公告)日：2005-08-04

申请号：US11045825

申请日：2005-01-27

申请人： Renee Johnston ,  Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

发明人： Renee Johnston ,  Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

IPC分类号： H04B3/23 ,  H04Q1/457 ,  H04M9/08

CPC分类号： H04B3/23 ,  H04Q1/4575

摘要： The present invention relates generally to tone detection in echo canceling systems, and more particularly to a method of monitoring oscillations of adaptive filter coefficients for narrow band tone detection in echo cancellation systems. The invention is directed at improving communication in a telephone communication network having one or more hybrid connections. A method for detecting continuous tones in an echo canceling system having an adaptive filter is provided. Continuous tones have a deleterious effect on the performance of adaptive filters. In the present invention, the adaptive filter coefficients are monitored. Oscillation of those coefficients indicates continuous tone presence.

摘要翻译： 本发明一般涉及回波消除系统中的音调检测，更具体地说，涉及一种监测回波消除系统中的窄带音检测的自适应滤波器系数的振荡的方法。 本发明旨在改进具有一个或多个混合连接的电话通信网络中的通信。 提供一种用于在具有自适应滤波器的回波消除系统中检测连续音调的方法。 连续色调对自适应滤波器的性能有不利影响。 在本发明中，监视自适应滤波器系数。 这些系数的振荡表示连续色调存在。

公开(公告)号：US07792280B2

公开(公告)日：2010-09-07

申请号：US11045825

申请日：2005-01-27

申请人： Renee Johnston ,  Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

发明人： Renee Johnston ,  Mirjana Popovic ,  Dieter Schulz ,  Jan Radecki

IPC分类号： H04M9/08

CPC分类号： H04B3/23 ,  H04Q1/4575

摘要： The present invention relates generally to tone detection in echo canceling systems, and more particularly to a method of monitoring oscillations of adaptive filter coefficients for narrow band tone detection in echo cancellation systems. The invention is directed at improving communication in a telephone communication network having one or more hybrid connections. A method for detecting continuous tones in an echo canceling system having an adaptive filter is provided. Continuous tones have a deleterious effect on the performance of adaptive filters. In the present invention, the adaptive filter coefficients are monitored. Oscillation of those coefficients indicates continuous tone presence.

摘要翻译： 本发明一般涉及回波消除系统中的音调检测，更具体地说，涉及一种监测回波消除系统中的窄带音检测的自适应滤波器系数的振荡的方法。 本发明旨在改进具有一个或多个混合连接的电话通信网络中的通信。 提供一种用于在具有自适应滤波器的回波消除系统中检测连续音调的方法。 连续色调对自适应滤波器的性能有不利影响。 在本发明中，监视自适应滤波器系数。 这些系数的振荡表示连续色调存在。

公开(公告)号：US07738653B2

公开(公告)日：2010-06-15

申请号：US11608177

申请日：2006-12-07

申请人： Yonghua Fang ,  Mirjana Popovic ,  Dieter Schulz

发明人： Yonghua Fang ,  Mirjana Popovic ,  Dieter Schulz

IPC分类号： H04M9/00

CPC分类号： H04M7/0096 ,  H04B3/493 ,  H04M3/002 ,  H04M3/28 ,  H04M3/42314 ,  H04M7/14

摘要： A method of selecting an optimum impedance for a loop start trunk line, comprising successively applying respective ones of a plurality of impedance settings to the loop start trunk line, for each impedance setting measuring the impulse response of the trans-hybrid echo path by applying audio test signals to obtain a time-domain trans-hybrid transfer function and deriving a frequency-domain spectrum representative of trans-hybrid loss, and then calculating figure of merit of the transfer function based on the power spectrum. Once all impedance settings have been tested, the optimum impedance is selected as the impedance setting associated with the highest calculated figure of merit.

摘要翻译： 一种选择环路起始干线的最佳阻抗的方法，包括：针对每个通过应用音频测量跨混合回波路径的脉冲响应的阻抗设置，将多个阻抗设置中的相应的阻抗设置连续地应用于环路起始干线 测试信号以获得时域跨混合传递函数并导出代表跨混合损耗的频域频谱，然后基于功率谱计算传递函数的品质因数。 一旦所有的阻抗设置都被测试，最佳阻抗被选择为与最高计算品质因数相关联的阻抗设置。

公开(公告)号：US07693276B2

公开(公告)日：2010-04-06

申请号：US11351133

申请日：2006-02-09

申请人： Yonghua Fang ,  Renee Johnston ,  Mirjana Popovic ,  Dieter Schulz

发明人： Yonghua Fang ,  Renee Johnston ,  Mirjana Popovic ,  Dieter Schulz

IPC分类号： H04M9/08

CPC分类号： H04B3/23

摘要： A method of determining residue-echo threshold for the trans-hybrid echo path of a loop start (LS) trunk line, comprising the steps of estimating the impulse response of the trans-hybrid echo path, passing a speech-like signal through the LS trunk circuit and collecting the echo signal. The collected echo signal is compared to the convolution of the speech-like signal with the estimated impulse response. The difference between the convolution result and the collected echo signal is the residue echo, which represents the effect of nonlinearity. With different levels of excitation signal, a curve of residue echo power level against input signal level is obtained, and the distortion characteristics are derived from this curve.

摘要翻译： 一种确定环路起始（LS）干线的跨混合回波路径的残余回波阈值的方法，包括以下步骤：估计跨混合回波路径的脉冲响应，将语音样信号通过LS 中继电路并收集回波信号。 将收集的回波信号与语音样信号与估计的脉冲响应的卷积进行比较。 卷积结果与收集的回波信号之间的差异是残差回波，表示非线性的影响。 利用不同的激发信号，获得残留回波功率与输入信号电平的关系曲线，并从该曲线导出失真特性。

公开(公告)号：US20070133786A1

公开(公告)日：2007-06-14

申请号：US11608470

申请日：2006-12-08

申请人： Dieter Schulz ,  Yonghua Fang ,  Renee Johnston ,  Mirjana Popovic

发明人： Dieter Schulz ,  Yonghua Fang ,  Renee Johnston ,  Mirjana Popovic

IPC分类号： H04M9/08

CPC分类号： H04B3/23 ,  H04B3/493

摘要： An echo canceling system has an adaptive filter connected to an echo source, for canceling echo from an echo path. A fixed echo conditioning filter is connected in series with the adaptive filter, intermediate the echo source and the adaptive filter. The fixed echo conditioning filter cancels the constant part of the echo path using a measured impulse response of the echo path.

摘要翻译： 回波消除系统具有连接到回波源的自适应滤波器，用于从回波路径消除回波。 固定回波调理滤波器与自适应滤波器串联连接，在回波源和自适应滤波器之间。 固定回波调理滤波器使用测量的回波路径的脉冲响应来消除回波路径的恒定部分。

公开(公告)号：US06999582B1

公开(公告)日：2006-02-14

申请号：US09488141

申请日：2000-01-20

申请人： Mirjana Popovic ,  Dieter Schulz

发明人： Mirjana Popovic ,  Dieter Schulz

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： A method for suppressing echo signals generated in a communication path such as acoustic coupling between a speaker and a microphone in a telephone device handset includes the steps of monitoring signals supplied to the communication path to determine an attribute thereof and masking signals received from the communication path as a function of the determined attribute of the monitored signals thereby to suppress echo.

摘要翻译： 一种用于抑制在诸如电话设备手机中的扬声器和麦克风之间的声耦合的通信路径中产生的回波信号的方法包括以下步骤：监测提供给通信路径的信号，以确定其属性，以及屏蔽从通信路径接收的信号 作为所确定的被监测信号的属性的函数，从而抑制回波。