公开(公告)号：US08271051B2

公开(公告)日：2012-09-18

申请号：US12792884

申请日：2010-06-03

申请人： Guofeng Wang

发明人： Guofeng Wang

IPC分类号： H04B1/38 ,  H04M9/08

CPC分类号： H04M9/082

摘要： A method and system for eliminating echo in a speaker-microphone communication system are provided. The method includes the steps of: performing a noise energy estimating process on a local microphone signal in order to obtain an estimated noise signal, wherein the local microphone signal includes a local voice signal, possible background noise signal, and possible remote voice signal output from a speaker and received by a microphone; performing an echo estimating process on a remote voice signal to obtain an estimated echo signal, wherein the remote voice signal is output from the speaker; determining an error signal from the local microphone signal and the estimated echo signal; calculating a variance (σe2) of the error signal and a variance ({circumflex over (σ)}n2) of the estimated noise signal; calculating a determinant (ξ), wherein the determinant (ξ) corresponds to the variance (σe2) of the error signal and variance ({circumflex over (σ)}n2) of the estimated noise signal; and comparing the determinant (ξ) and a preset threshold, wherein when the determinant (ξ) is lower than the preset threshold, it is determined that double-end talk has not occurred, otherwise, it is determined that double-end talk has occurred.

摘要翻译： 提供了一种用于消除扬声器 - 麦克风通信系统中的回波的方法和系统。 该方法包括以下步骤：对本地麦克风信号执行噪声能量估计处理，以获得估计的噪声信号，其中本地麦克风信号包括本地语音信号，可能的背景噪声信号和从 扬声器并由麦克风接收; 对远程语音信号执行回波估计处理以获得估计回波信号，其中所述远程语音信号从所述扬声器输出; 确定来自本地麦克风信号和估计回波信号的误差信号; 计算误差信号的方差（＆sgr; e2）和估计噪声信号的方差（{circumflex over（＆sgr;）} n2）; 计算行列式（＆xgr），其中行列式（＆xgr））对应于估计噪声信号的误差信号的方差（＆sgr; e2）和方差（{circumflex over（＆sgr;）} n2） 以及比较行列式（＆xgr）和预设阈值，其中当行列式（＆xgr））低于预设阈值时，确定没有发生双端通话，否则确定双端通话 已经发生了。

公开(公告)号：US20110124380A1

公开(公告)日：2011-05-26

申请号：US12792884

申请日：2010-06-03

申请人： Guofeng Wang

发明人： Guofeng Wang

IPC分类号： H04W88/02

CPC分类号： H04M9/082

摘要： A method and system for eliminating echo in a speaker-microphone communication system are provided. The method includes the steps of: performing a noise energy estimating process on a local microphone signal in order to obtain an estimated noise signal, wherein the local microphone signal includes a local voice signal, possible background noise signal, and possible remote voice signal output from a speaker and received by a microphone; performing an echo estimating process on a remote voice signal to obtain an estimated echo signal, wherein the remote voice signal is output from the speaker; determining an error signal from the local microphone signal and the estimated echo signal; calculating a variance (σe2) of the error signal and a variance ({circumflex over (σ)}n2) of the estimated noise signal; calculating a determinant (ξ), wherein the determinant (ξ) corresponds to the variance (σe2) of the error signal and variance ({circumflex over (σ)}n2) of the estimated noise signal; and comparing the determinant (ξ) and a preset threshold, wherein when the determinant (ξ) is lower than the preset threshold, it is determined that double-end talk has not occurred, otherwise, it is determined that double-end talk has occurred.

摘要翻译： 提供了一种用于消除扬声器 - 麦克风通信系统中的回波的方法和系统。 该方法包括以下步骤：对本地麦克风信号执行噪声能量估计处理，以获得估计的噪声信号，其中本地麦克风信号包括本地语音信号，可能的背景噪声信号和从 扬声器并由麦克风接收; 对远程语音信号执行回波估计处理以获得估计回波信号，其中所述远程语音信号从所述扬声器输出; 确定来自本地麦克风信号和估计回波信号的误差信号; 计算误差信号的方差（＆sgr; e2）和估计噪声信号的方差（{circumflex over（＆sgr;）} n2）; 计算行列式（＆xgr），其中行列式（＆xgr））对应于估计噪声信号的误差信号的方差（＆sgr; e2）和方差（{circumflex over（＆sgr;）} n2） 以及比较行列式（＆xgr）和预设阈值，其中当行列式（＆xgr））低于预设阈值时，确定没有发生双端通话，否则确定双端通话 已经发生了。

公开(公告)号：US6116800A

公开(公告)日：2000-09-12

申请号：US142287

申请日：1998-09-02

申请人： Guoyue Wang ,  Guofeng Wang ,  Dianjun Wang

发明人： Guoyue Wang ,  Guofeng Wang ,  Dianjun Wang

IPC分类号： B43K21/08 ,  A45D46/04

CPC分类号： B43K21/08

摘要： A propelling pencil has a writing core which can be fed out and drawn back controllably and freely. The front portion of the propelling pencil is inserted in the lower end of the shaft of the propelling pencil. The inner surface of the shaft has several ridges which together act as longitudinal guides for the writing core holder. A helical wire, controlling the core holder movement, is formed by winding a flat metal wire. The core holder is made of an elastic material and has a hole therein which has a large diameter at each end thereof and a relatively small diameter at its central region. The core holder is also provided with longitudinal ridges in its lower portion to prevent rotation of the writing core held therein.

摘要翻译： PCT No.PCT / CN97 / 00071 Sec。 371日期：1998年9月2日 102（e）1998年9月2日PCT PCT 1997年7月14日PCT公布。 公开号WO98 / 13217 日期1998年2月4日推荐铅笔有一个书写核心，可以自由地自由地退出并拉回。 推进铅笔的前部插入推进笔的轴的下端。 轴的内表面具有几个脊，它们一起作为书写芯保持器的纵向引导件。 通过缠绕扁平金属丝来形成控制芯架运动的螺旋线。 芯保持器由弹性材料制成，并且在其中具有孔，其中每个端部具有大直径，并且在其中心区域具有相对小的直径。 芯保持器在其下部还设置有纵向脊，以防止保持在其中的书写芯的旋转。