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    • 4. 发明公开
    • Method and apparatus for echo cancellation with self-deactivation
    • 对于回声消除与自失的方法和装置
    • EP1104116A3
    • 2002-01-02
    • EP00307185.9
    • 2000-08-21
    • LUCENT TECHNOLOGIES INC.
    • Dunn, James PatrickZhang, Peng
    • H04B3/23H04M9/08
    • H04B3/23
    • An echo canceling system (100) with self deactivation includes an echo canceller (140) based on an adaptive filter (152), and an echo detector (160). The adaptive filter (152) determines an estimate of an echo signal present in an untreated signal received from a "near" end of a communications channel. In order to produce an echo-canceled received signal, the echo canceller (140) subtracts the estimated echo from the untreated received signal. The echo detector (160) compares the energy of the untreated received signal and the energy of the echo-canceled received signal. The difference represents the energy in the estimated echo signal generated by the adaptive filter. If this energy is large, significant echo is present. The echo canceller remains activated, and the echo detector selects the echo-canceled received signal for output. If the estimated echo energy is small, little or no cancelable echo is present. The echo canceller is deactivated, and the echo detector selects the untreated received signal for output. Where plural channels of echo cancellation are provided, the deactivated echo canceller may be reallocated to service another communications channel.
    • 9. 发明公开
    • Method and apparatus for echo cancellation with self-deactivation
    • Verfahren und Vorrichtung zurEchounterdrückungmit Selbstdeaktivierung
    • EP1104116A2
    • 2001-05-30
    • EP00307185.9
    • 2000-08-21
    • LUCENT TECHNOLOGIES INC.
    • Dunn, James PatrickZhang, Peng
    • H04B3/23
    • H04B3/23
    • An echo canceling system (100) with self deactivation includes an echo canceller (140) based on an adaptive filter (152), and an echo detector (160). The adaptive filter (152) determines an estimate of an echo signal present in an untreated signal received from a "near" end of a communications channel. In order to produce an echo-canceled received signal, the echo canceller (140) subtracts the estimated echo from the untreated received signal. The echo detector (160) compares the energy of the untreated received signal and the energy of the echo-canceled received signal. The difference represents the energy in the estimated echo signal generated by the adaptive filter. If this energy is large, significant echo is present. The echo canceller remains activated, and the echo detector selects the echo-canceled received signal for output. If the estimated echo energy is small, little or no cancelable echo is present. The echo canceller is deactivated, and the echo detector selects the untreated received signal for output. Where plural channels of echo cancellation are provided, the deactivated echo canceller may be reallocated to service another communications channel.
    • 具有自动去激活的回波消除系统(100)包括基于自适应滤波器(152)的回声消除器(140)和回波检测器(160)。 自适应滤波器(152)确定存在于从通信信道的“近”端接收的未处理信号中的回波信号的估计。 为了产生回波消除的接收信号,回波消除器(140)从未处理的接收信号中减去估计回波。 回波检测器(160)将未处理的接收信号的能量与回波消除的接收信号的能量进行比较。 差值表示由自适应滤波器产生的估计回波信号中的能量。 如果这种能量很大,则存在显着的回波。 回波消除器保持激活,回波检测器选择回波消除的接收信号进行输出。 如果估计的回波能量很小,很少或不存在可消除的回波。 回波消除器被禁用,回波检测器选择未处理的接收信号进行输出。 在提供多个回声消除通道的情况下,可以重新分配去激活的回声消除器来服务另一个通信信道。