公开(公告)号：US20080267378A1

公开(公告)日：2008-10-30

申请号：US11569170

申请日：2005-05-20

申请人： Cornelis Pieter Janse ,  Cheng Chao Tchang ,  Abraham Janssens

发明人： Cornelis Pieter Janse ,  Cheng Chao Tchang ,  Abraham Janssens

IPC分类号： H04M3/42

CPC分类号： H04M9/08 ,  H04M3/56 ,  H04M3/568

摘要： A conference system (1) comprises a central unit (2) and speaker units (3) which are connectable to the central unit. The central unit (2), which serves to combine speech signals from the speaker units (3) and to distribute the combined speech signals to said units, comprises an adaptive filter (23) for suppressing feedback. Each speaker unit (3) comprises a microphone (33), a loudspeaker (34), an activation switch (35) and an adaptive filter (36) coupled between the microphone (33) and the loudspeaker (34). When the speaker unit is not activated, the adaptive filter (36) serves as an echo canceller, while serving as a feedback suppressor when the speaker unit is activated. By keeping the loudspeaker (34) always on, any transients due to mis-adaptations of the filter (36) are avoided.

摘要翻译： 会议系统（1）包括可连接到中央单元的中央单元（2）和扬声器单元（3）。 用于组合来自扬声器单元（3）的语音信号并将组合语音信号分配给所述单元的中央单元（2）包括用于抑制反馈的自适应滤波器（23）。 每个扬声器单元（3）包括麦克风（33），扬声器（34），激活开关（35）和耦合在麦克风（33）和扬声器（34）之间的自适应滤波器（36）。 当扬声器单元未被激活时，自适应滤波器（36）用作回声消除器，同时当扬声器单元被激活时用作反馈抑制器。 通过保持扬声器（34）始终处于打开状态，避免了由于过滤器（36）的错误适应引起的任何瞬变。