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1. 发明申请

WO1995019085A1 ECHO CANCELLER USING A CENTER CLIPPER WITH THRESHOLD SET ACCORDING TO ESTIMATED ECHO 审中-公开
标题翻译： ECHO CANCELLER使用带有阈值的中心剪辑器根据估算的ECHO
公开(公告)号：WO1995019085A1
公开(公告)日：1995-07-13
申请号：PCT/US1995000228
申请日：1995-01-03
申请人： ERICSSON INC. , RASMUSSON, Jim, A., J.
发明人： ERICSSON INC.
IPC分类号： H04M09/08
CPC分类号： H04M9/082
摘要： An echo-cancelling system and method uses an echo estimate (714) to modify the error signal (716) which is obtained by the difference between an echo signal (706) and the echo estimate (714). The modified error signal (718), rather than the error signal itself, is transmitted. By using the echo estimate (714) as a parameter for modifying the error signal (716), improved hands-free performance may be obtained in a vehicular radiotelephone, such as a cellular telephone. Preferably, modification of the electrical error signal is performed by a center clipper (720) which removes a portion of the electrical error signal which is below a variable threshold, wherein the variable threshold is determined by the echo estimate electrical signal. The variable threshold may be produced from the echo estimate electrical signal using an envelope detector (710).
摘要翻译：回波消除系统和方法使用回波估计（714）来修改由回波信号（706）和回波估计（714）之间的差异获得的误差信号（716）。发送修正误差信号（718）而不是误差信号本身。通过使用回波估计（714）作为用于修改误差信号（716）的参数，可以在诸如蜂窝电话的车载无线电话机中获得改进的免提性能。优选地，通过去除低于可变阈值的电差错信号的一部分的中心限幅器（720）执行电差错信号的修改，其中可变阈值由回波估计电信号确定。可以使用包络检测器（710）从回波估计电信号产生可变阈值。

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