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41. 发明申请

US20090169027A1 ECHO SUPPRESSOR 审中-公开
公开(公告)号：US20090169027A1
公开(公告)日：2009-07-02
申请号：US12305154
申请日：2007-05-25
申请人： Takefumi Ura , Takeo Kanamori
发明人： Takefumi Ura , Takeo Kanamori
IPC分类号： H04B3/20
CPC分类号： H04M9/082 , H04R3/02
摘要： It is an object of the present invention to provide an echo suppressor which is simple in construction in comparison with the conventional echo suppressor, and which can suppress echoes corresponding to the spatial transfer paths, and reduce the amount of calculations necessary to suppress echoes. The echo suppressor is operative under the condition that transfer functions corresponding to spatial transfer paths between two or more loudspeakers (105, 106) and one or more microphones (107, 108) are estimated on the basis of symmetrical arrangement of the loudspeakers (105, 106) and the microphones (107, 108). The echo suppressor includes: a target signal generating unit (111) operable to generate target signals to be used to suppress echoes which are in signals indicating sounds received by the microphones (107, 108) from the loudspeakers (105, 106); a reference signal generating unit (112) operable to generate reference signals corresponding to the target signals on the basis of signals indicating sounds to be outputted from the loudspeakers (105, 106); and an echo suppressing unit (113) operable to suppress, on the basis of the target signals and the reference signals, echoes which are in signals indicating sounds received by the microphones (107, 108).
摘要翻译：本发明的目的是提供一种与传统的回波抑制器相比结构简单的回波抑制器，并且可以抑制与空间传送路径对应的回波，并且减少抑制回波所需的计算量。在基于扬声器（105,106）的对称布置的基础上估计在两个或多个扬声器（105,106）和一个或多个麦克风（107,108）之间的空间传送路径的传递函数的条件下，回波抑制器可操作， 106）和麦克风（107,108）。回波抑制器包括：目标信号生成单元，其可操作以产生要用于抑制来自扬声器（105,106）的麦克风（107,108）中接收到的表示声音的信号的回波的目标信号; 参考信号生成单元，用于根据要从扬声器（105,106）输出的声音的信号产生与目标信号对应的参考信号; 以及回波抑制单元，其可操作以基于所述目标信号和所述参考信号来抑制处于表示由所述麦克风（107,108）接收的声音的信号的回波。

42. 发明授权

US5463618A Echo canceller 失效
标题翻译：回音消除器
公开(公告)号：US5463618A
公开(公告)日：1995-10-31
申请号：US249888
申请日：1994-05-26
申请人： Hiroki Furukawa , Junichi Tagawa , Takeo Kanamori , Satoru Ibaraki
发明人： Hiroki Furukawa , Junichi Tagawa , Takeo Kanamori , Satoru Ibaraki
IPC分类号： H04B3/23 , H04M9/08
CPC分类号： H04B3/234 , H04M9/082
摘要： In an echo canceller, a first adaptive filter (1) estimates an impulse response of an echo path between reception and transmission side by an NLMS algorithm to synthesize a pseud echo, while a second adaptive filter (3) determines whether there is an echo path change or a double talk. A voice detector (8) detects a short time power of the received input signal (x) to determine whether far-end speech is present or absent. The voice detector controls the second adaptive filter (3) to execute adaptation of the second adaptive filter for renewal of an impulse response of an echo path when far-end speech is present and otherwise to suspend the adaptation of the second adaptive filter when far-end speech is absent, while a double talk detector (9) controls the first adaptive filter to execute or suspend adaptation of the first adaptive filter according to the determination results of the voice detector.
摘要翻译：在回波消除器中，第一自适应滤波器（1）通过NLMS算法估计接收侧和发送侧之间的回波路径的脉冲响应以合成伪回波，而第二自适应滤波器（3）确定是否存在回波路径改变或双重谈话。语音检测器（8）检测接收的输入信号（x）的短时间功率，以确定是否存在远端语音。语音检测器控制第二自适应滤波器（3）执行第二自适应滤波器的适应，以便在存在远端语音时对回波路径的脉冲响应进行更新，并且当远端语音存在时暂停第二自适应滤波器的自适应，结束语言不存在，而双通话检测器（9）根据语音检测器的确定结果控制第一自适应滤波器来执行或暂停适应第一自适应滤波器。

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